CN109031687B - System and method for adjusting speckle-dissipating laser light source - Google Patents
System and method for adjusting speckle-dissipating laser light source Download PDFInfo
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- CN109031687B CN109031687B CN201810930432.0A CN201810930432A CN109031687B CN 109031687 B CN109031687 B CN 109031687B CN 201810930432 A CN201810930432 A CN 201810930432A CN 109031687 B CN109031687 B CN 109031687B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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Abstract
The invention discloses a regulating system of a speckle-dissipating laser light source, wherein the speckle-dissipating laser light source comprises a laser and a speckle-dissipating device positioned on an emergent light path of the laser, the speckle-dissipating device comprises a first optical wedge and a second optical wedge which are arranged in a 180-desymmetry fit mode, and the regulating system comprises: and the data processing module is used for obtaining a phase difference value of the laser beam emitted by the laser after entering the speckle eliminating device and dividing the laser beam into two beams of light according to the size parameter of the speckle eliminating device and the current relative position of the speckle eliminating device and the laser, comparing the phase difference value with a first preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emitting light path of the laser. The invention can change the elimination effect of the spot dissipation device on the laser beam emitted by the laser by adjusting the current relative position of the spot dissipation device and the laser.
Description
Technical Field
The invention relates to the field of laser projection display, in particular to a system and a method for adjusting a speckle-dissipating laser light source.
Background
When the laser is used as a projection light source, interference (self-coherence) between laser spots and the spots of the laser can be caused due to the good coherence, stray light with uneven brightness is formed beside the laser emergent spots, namely laser speckles, and the speckles can influence projection imaging pictures and cause discomfort in viewing.
At present, a plurality of speckle dissipation devices exist, one of which is to arrange a speckle dissipation device on an emergent light path of a laser, wherein the speckle dissipation device comprises a first optical wedge and a second optical wedge which are symmetrically attached to each other at 180 degrees, and the speckle dissipation device and the laser form a speckle dissipation laser light source. However, the relative position relationship between the laser and the spot dissipation device in the spot dissipation laser light source is fixed, and the effect of the spot dissipation device on eliminating laser beams emitted by the laser cannot be changed by adjusting the current relative position of the spot dissipation device and the laser.
Therefore, it is desirable to provide a system and a method for adjusting a speckle-dissipating laser light source, which can improve the speckle-dissipating effect by adjusting the relative positions of a laser and a speckle-dissipating device.
Disclosure of Invention
The invention aims to provide a system and a method for adjusting a speckle-dissipating laser light source, which can change the effect of a speckle-dissipating device on eliminating laser beams emitted by a laser by adjusting the current relative position of the speckle-dissipating device and the laser.
In order to achieve the above object, a first aspect of the present invention provides a system for adjusting a speckle-elimination laser light source, where the speckle-elimination laser light source includes a laser and a speckle-elimination device located in an exit light path of the laser, the speckle-elimination device includes a first optical wedge and a second optical wedge symmetrically attached to each other at 180 °, and the system includes:
the data processing module is used for obtaining the phase difference value of the laser beam emitted by the laser after entering the speckle eliminating device and being divided into two beams of light according to the size parameter of the speckle eliminating device and the current relative position of the speckle eliminating device and the laser,
and comparing the phase difference value with a first preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
Preferably, the system further comprises:
and the displacement mechanism is used for driving the speckle eliminating device to move in the direction vertical to the emergent light path of the laser.
Preferably, the data processing module generates a control instruction according to the comparison result, and the displacement mechanism drives the speckle eliminating device to move in response to the control instruction, so that the speckle eliminating device divides a laser beam emitted by the laser into two beams after entering the speckle eliminating device, and the phase difference value of the two beams reaches the first preset value.
Preferably, the displacement mechanism comprises a stepper motor.
The invention provides a regulating method of a spot-dissipating laser light source in a second aspect, which comprises the following steps:
obtaining a phase difference value of laser beams emitted by the laser after entering the speckle elimination device and dividing the laser beams into two beams according to the size parameters of the speckle elimination device and the current relative position of the speckle elimination device and the laser;
and comparing the phase difference value with a first preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
The third aspect of the present invention provides an adjusting system for a speckle-dissipating laser light source, where the speckle-dissipating laser light source includes a laser and a speckle-dissipating device located on an exit light path of the laser, the speckle-dissipating device includes a first optical wedge and a second optical wedge symmetrically attached to each other at 180 degrees, and the adjusting system further includes:
the image acquisition module is used for acquiring a projection image of the speckle-dissipating laser light source;
and the data processing module is used for obtaining the speckle degree of the laser beam according to the projected image, comparing the speckle degree with a second preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
Preferably, the method further comprises the following steps:
and the displacement mechanism is used for driving the speckle eliminating device to move in the direction vertical to the emergent light path of the laser.
Preferably, the data processing module generates a control instruction according to the comparison result, and the displacement mechanism responds to the control instruction to drive the speckle reduction device to move, so that the speckle degree of the laser beam obtained by the projection image reaches the second preset value.
Preferably, the displacement mechanism comprises a stepper motor.
The fourth aspect of the invention provides a method for adjusting a spot-dissipating laser light source, which comprises the following steps:
collecting a projection image of the speckle-dissipating laser light source;
obtaining the speckle degree of the laser beam according to the projection image;
and comparing the speckle degree with a second preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
The invention has the following beneficial effects:
the technical scheme of the invention has the advantages of clear principle and simple design, and the invention can adjust and regulate the current relative position of the speckle eliminating device and the laser, thereby changing the speckle eliminating effect of the speckle eliminating device on laser beams emitted by the laser, improving the practicability and convenience, and having simple structure, convenient installation and reduced production cost.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a schematic diagram of a regulation system for a speckle-dissipating laser light source according to an embodiment of the present invention;
FIG. 2 shows a schematic structural diagram of a speckle reduction device according to an embodiment of the present invention;
FIG. 3 shows a flow diagram of a regulation system for a speckle-dissipating laser light source in a preferred embodiment of the invention;
FIG. 4 shows a flow chart of a method of tuning an evanescent spot laser light source as set forth in one embodiment of the present invention;
FIG. 5 is a schematic diagram of a regulation system for a speckle-dissipating laser light source according to another embodiment of the present invention;
FIG. 6 shows a flow diagram of a regulation system for a speckle-dissipating laser light source in a preferred embodiment of the invention;
FIG. 7 shows a flow chart of a method of tuning an evanescent spot laser light source according to an embodiment of the present invention;
fig. 8 shows a schematic structural diagram of a computer device according to a last embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Fig. 1 is a flowchart of an adjusting system of a speckle-elimination laser light source according to an embodiment of the present invention, and as shown in fig. 1, the speckle-elimination laser light source includes a laser and a speckle-elimination device located in an exit light path of the laser, the speckle-elimination device includes a first optical wedge and a second optical wedge symmetrically attached to each other at 180 degrees, and the adjusting system includes:
the data processing module is used for obtaining the phase difference value of the laser beam emitted by the laser after entering the spot dissipating device and dividing the laser beam into two beams of light according to the size parameter of the spot dissipating device and the current relative position of the spot dissipating device and the laser,
and comparing the phase difference value with a first preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
It should be noted that the incident surface of the first wedge should be understood as a surface contacted by the laser beam incident on the first wedge, the output surface of the first wedge should be understood as a surface contacted by the laser beam output to the second wedge, and accordingly, the incident surface of the second wedge should be understood as a surface contacted by the laser beam incident on the second wedge, and the output surface of the second wedge should be understood as a surface contacted by the laser beam output to the outside of the second wedge. In this embodiment, a laser beam emitted from a laser enters the first optical wedge perpendicularly to an entrance surface of the first optical wedge and exits perpendicularly to an exit surface of the second optical wedge, the entrance surface of the first optical wedge and the exit surface of the second optical wedge are parallel to each other, a shape of an speckle reduction device formed by the first optical wedge and the second optical wedge is a parallelogram, the first optical wedge and the second optical wedge have the same specification, and as shown in fig. 2, the first optical wedge and the second optical wedge may have a triangular shape in fig. 2, but those skilled in the art should understand that shapes of the first optical wedge and the second optical wedge are not limited thereto, and may also have a trapezoidal shape or other shapes.
It should be clear that in this embodiment the angle between the optical axis of the first wedge and the polarization direction of the laser beam is a 45 ° axis
Here, since the first and second wedges have the same size parameter, the angle between the optical axis of the second wedge and the polarization direction of the laser beam is also a 45 ° axis.
In a specific implementation of this embodiment, a phase difference value between two beams of laser light emitted from the laser after entering the speckle reduction device can be obtained as follows:
wherein d is1The thickness through which the laser beam passes in the first wedge, d2Is the thickness of the laser beam passing through the second wedge.
Specifically, the first optical wedge and the second optical wedge in this embodiment form a speckle elimination device through a gluing mode, based on the characteristics of the optical wedges, a birefringence phenomenon occurs after laser is incident into the optical wedges, and a laser beam is divided into ordinary light (o light) and extraordinary light (e light), as shown in an optical path diagram in fig. 2, only when the laser beam passes through a portion where the thicknesses of the first optical wedge and the second optical wedge are different, the ordinary light and the extraordinary light generate a certain phase difference, so that the purpose of reducing laser speckles can be achieved.
In the implementation of the embodiment, the displacement of the speckle eliminating device in the direction perpendicular to the outgoing light path of the laser is changed by adjusting the current relative position of the speckle eliminating device and the laser, so that the thickness of the laser beam passing through the first optical wedge and the second optical wedge in sequence can be changed, a certain phase difference value is generated between the ordinary light and the extraordinary light which are split when the laser beam enters the first optical wedge, the speckle eliminating efficiency of the speckle eliminating device on the laser beam can be changed, the data processing module is used for comparing the phase difference value of the laser beam emitted by the laser after entering the speckle eliminating device and then being split into two beams with the first preset value, and the comparison result is used for adjusting the displacement of the speckle eliminating device in the direction perpendicular to the outgoing light path of the laserThe distance is based on that the first preset value can be set by the user, for example, when the phase difference between the ordinary light and the extraordinary light reaches
The effect of reducing laser speckle can be achieved, so the first preset value can be set to
When the device is actually used, a user can automatically adjust the displacement distance of the despeckle device according to the comparison result.
As shown in fig. 3, in an optional implementation manner of this embodiment, the system further includes:
and the displacement mechanism is used for driving the speckle eliminating device to move in the direction vertical to the emergent light path of the laser.
The displacement mechanism drives the speckle eliminating device to move, so that the displacement distance of the speckle eliminating device in the direction perpendicular to the emergent light path of the laser can be adjusted, namely the current relative position of the speckle eliminating device and the laser is adjusted, the thickness of the laser beam entering the first optical wedge and the second optical wedge is changed, the phase difference value between the ordinary light and the extraordinary light separated by the laser beam entering the first optical wedge is further changed, and the effect of weakening the laser speckles is achieved.
In an optional implementation manner of this embodiment, the data processing module generates a control instruction according to the comparison result, and the displacement mechanism drives the speckle elimination device to move in response to the control instruction, so that the speckle elimination device divides a laser beam emitted by the laser into two beams after entering the speckle elimination device, and a phase difference value of the two beams reaches the first preset value.
The data processing module can send a control instruction to control the displacement mechanism to drive the speckle eliminating device to move, so that the automatic control function of the displacement mechanism can be realized, the system can realize automatic adjustment of the displacement distance of the speckle eliminating device, manpower is saved, and convenience is improved.
Further, the displacement mechanism includes a stepping motor. For example, the stepping motor drives the speckle elimination device to move when working, and after the speckle elimination device is moved, the speckle elimination device is fixed, so that the speckle elimination device can be adjusted, and the fixing method of the speckle elimination device includes: and arranging a positioning column on the side surface of the spot dissipation device, and dispensing and fixing the positioning column to a wall or other fixed points.
Fig. 4 is a flowchart of a regulation method based on an evanescent spot laser light source according to another embodiment of the present invention, as shown in fig. 4, the method includes the following steps:
obtaining a phase difference value of laser beams emitted by the laser after entering the speckle elimination device and dividing the laser beams into two beams according to the size parameters of the speckle elimination device and the current relative position of the speckle elimination device and the laser;
and comparing the phase difference value with a first preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
Fig. 5 is a flowchart of an adjusting system of a speckle-elimination laser light source according to still another embodiment of the present invention, and as shown in fig. 5, the speckle-elimination laser light source includes a laser and a speckle-elimination device located in an exit optical path of the laser, the speckle-elimination device includes a first optical wedge and a second optical wedge symmetrically attached to each other by 180 degrees, and the adjusting system further includes:
the image acquisition module is used for acquiring a projection image of the speckle-dissipating laser light source;
and the data processing module is used for obtaining the speckle degree of the laser beam according to the projected image, comparing the speckle degree with a second preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
According to the above, the displacement mechanism drives the speckle eliminating device to move, so that the displacement distance of the speckle eliminating device in the direction perpendicular to the emergent light path of the laser can be adjusted, that is, the current relative position of the speckle eliminating device and the laser is adjusted, the thickness of the laser beam entering the first optical wedge and the second optical wedge is changed, the phase difference value between the ordinary light and the extraordinary light separated by the laser beam entering the first optical wedge is further changed, and the effect of weakening the laser speckle is achieved. Therefore, the projected image of the speckle-eliminating laser light source can be collected, the projected image is analyzed through the data processing module to obtain the speckle degree of the projected image, the obtained speckle degree is compared with a second preset value, and the comparison result is used as a basis for adjusting the displacement distance of the speckle-eliminating device in the direction perpendicular to the laser emergent light path. The speckle degree reflects the speckle eliminating efficiency of the laser beam, the effect of eliminating the speckles of the laser beam after passing through the speckle eliminating device can be known through the speckle degree so as to change the speckles of the laser beam, and the second preset value can be set by a user.
Specifically, the speckle degree of the laser beam can be obtained by the following formula:
wherein S is speckle degree, σIIs the standard deviation of the light intensity and,<I>is the average value of light intensity, XiIn order to distribute the luminance values randomly,
is the mean value of the luminance.
The data processing module obtains the random distribution brightness value and the brightness mean value of the image through the image data, and therefore the speckle degree can be obtained through calculation.
The following describes a regulating system of the speckle-elimination laser light source according to this embodiment with reference to an application scenario: when a user uses the laser, the laser is turned on, one path of laser beam emitted by the laser irradiates the speckle eliminating device, the processed laser beam is emitted by the speckle eliminating device to form a projected image, the image acquisition module acquires the projected image, and the data processing module obtains the speckle degree of the image according to the projected image, so that the speckle eliminating effect of the laser beam can be changed, and the displacement distance of the speckle eliminating device can be adjusted according to the speckle degree.
As shown in fig. 6, in an optional implementation manner of this embodiment, the system further includes: further comprising:
and the displacement mechanism is used for driving the speckle eliminating device to move in the direction vertical to the emergent light path of the laser.
In an optional implementation manner of this embodiment, the data processing module generates a control instruction according to the comparison result, and the displacement mechanism drives the speckle reduction device to move in response to the control instruction, so that the speckle degree of the laser beam obtained by the projection image reaches the second preset value.
The data processing module can send a control instruction to control the displacement mechanism to drive the speckle eliminating device to move, so that the automatic control function of the displacement mechanism can be realized, the system can realize automatic adjustment of the displacement distance of the speckle eliminating device to enable the speckle degree of the laser beam obtained by the projected image to reach the second preset value, the purpose of adjusting the speckle degree is achieved, and manpower is saved.
In an alternative embodiment of this embodiment, the displacement mechanism comprises a stepper motor.
In an alternative embodiment of this embodiment, the system further comprises a projection screen, a holographic diffuser screen for presenting the projected image of the speckle-dissipating laser light source, where the image acquisition module may acquire the projected image projected on the projection screen.
It should be appreciated by those skilled in the art that in an alternative implementation of this embodiment, the image capture module may be a camera.
It should be understood by those skilled in the art that the image capturing module is not limited to a camera, and other devices or devices with image capturing function should also fall within the scope of the present invention.
As shown in fig. 7, yet another embodiment of the present invention provides a method of adjusting a speckle-dissipating laser light source, comprising the steps of:
collecting a projection image of the speckle-dissipating laser light source;
obtaining the speckle degree of the laser beam according to the projection image;
and comparing the speckle degree with a second preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
In a preferred embodiment of this embodiment, the method further comprises:
respectively collecting a projection image of the laser light source for dissipating the spots and a projection image of the laser light source;
obtaining a first speckle degree of the laser beam according to the projection image of the speckle-dissipating laser light source;
obtaining a second speckle degree of the laser beam according to the projection image of the laser light source;
and performing difference operation on the first speckle degree and the second speckle degree, comparing a calculation result with a preset third value, and adjusting the speckle cancellation device according to the comparison result.
Here, it should be noted that the speckle-elimination laser light source includes a laser and a speckle-elimination device, and the laser light source includes a laser that does not include the speckle-elimination device, that is, a projected image of the laser light source does not pass through the speckle-elimination device for speckle elimination processing, in this embodiment, a difference value operation is performed between a first speckle degree of the speckle-elimination laser light source and a second speckle degree of the laser light source, and a calculation result is compared with a preset third preset value, so that speckle-elimination efficiency of the speckle-elimination device on the laser light source can be understood, and the speckle-elimination device is adjusted according to the comparison result, so that the calculation result reaches the third preset value, where the third preset value can be set according to a user requirement, and for example, the third preset threshold value can be set to 28%.
Further, when the calculation result reaches the third preset value, fixing the speckle eliminating device;
collecting a projection image of the fixed speckle-dissipating laser light source;
obtaining a third speckle degree of the laser beam according to the fixed projection image of the evanescent spot laser light source;
and performing difference operation on the third speckle degree and the second speckle degree, comparing the calculation result with a preset fourth preset value, and judging whether the speckle eliminating device is adjusted according to the comparison result.
Here, it should be noted that the fixing mode of the speckle eliminating device may be glue dispensing and curing, that is, the relative position between the adjusted speckle eliminating device and the laser is fixed, after the fixing is completed, the fixed projection image of the speckle eliminating laser light source is collected, a third speckle degree of the laser beam is obtained according to the fixed projection image of the speckle eliminating laser light source, a difference value operation is performed on the third speckle degree and the second speckle degree, and a calculation result is compared with a preset fourth preset value, in this way, in order to check whether the speckle eliminating device has a position deviation in the fixing process, so that the accuracy of the speckle eliminating can be ensured, whether the speckle eliminating device is adjusted is determined according to the comparison result, where the fourth preset value may be set according to user requirements, and exemplarily, the fourth preset value may be set to 25%, that is, and when the calculation result is larger than the fourth preset value, the adjustment is finished, and if the calculation result is smaller than the fourth preset value, the adjustment is failed, and the dissipated spots need to be adjusted again.
A final embodiment of the invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the above-mentioned method of adjusting an anti-speckle laser light source when executing the program. As shown in fig. 8, a computer system suitable for implementing the server provided in the present embodiment includes a Central Processing Unit (CPU) that can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) or a program loaded from a storage section into a Random Access Memory (RAM). In the RAM, various programs and data necessary for the operation of the computer system are also stored. The CPU, ROM, and RAM are connected thereto via a bus. An input/output (I/O) interface is also connected to the bus.
An input section including a keyboard, a mouse, and the like; an output section including a speaker and the like such as a Liquid Crystal Display (LCD); a storage section including a hard disk and the like; and a communication section including a network interface card such as a LAN card, a modem, or the like. The communication section performs communication processing via a network such as the internet. The drive is also connected to the I/O interface as needed. A removable medium such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive as necessary, so that a computer program read out therefrom is mounted into the storage section as necessary.
In particular, it is mentioned that the processes described in the above flowcharts can be implemented as computer software programs according to the present embodiment. For example, the present embodiments include a computer program product comprising a computer program tangibly embodied on a computer-readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium.
The flowchart and schematic diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to the present embodiments. In this regard, each block in the flowchart or schematic diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the schematic and/or flowchart illustration, and combinations of blocks in the schematic and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the present embodiment may be implemented by software or hardware. The described units may also be provided in a processor, and may be described as: a processor includes an acquisition module, a calculation module, a detection module, and the like. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves. For example, the data processing module may also be described as a "conditioning module".
As another aspect, the present application also provides a computer-readable storage medium, which may be the computer-readable storage medium included in the apparatus in the above-described embodiments; or it may be a separate computer-readable storage medium not incorporated in the terminal. The computer readable storage medium stores one or more programs for use by one or more processors in performing the method of adjusting an evanescent spot laser light source described in the present invention.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (5)
1. An adjustment system of a speckle-dissipating laser light source, the speckle-dissipating laser light source comprises a laser and a speckle-dissipating device located on an emergent light path of the laser, the speckle-dissipating device comprises a first optical wedge and a second optical wedge which are symmetrically attached to each other by 180 degrees, and the adjustment system comprises:
the data processing module is used for obtaining the phase difference value of the laser beam emitted by the laser after entering the speckle eliminating device and being divided into two beams of light according to the size parameter of the speckle eliminating device and the current relative position of the speckle eliminating device and the laser,
and comparing the phase difference value with a first preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
2. The system of claim 1, further comprising:
and the displacement mechanism is used for driving the speckle eliminating device to move in the direction vertical to the emergent light path of the laser.
3. The system of claim 2, wherein: the data processing module generates a control instruction according to the comparison result, and the displacement mechanism responds to the control instruction to drive the speckle eliminating device to move, so that the speckle eliminating device divides a laser beam emitted by the laser into two beams after entering the speckle eliminating device, and the phase difference value of the two beams reaches the first preset value.
4. The system of claim 2 or 3, wherein the displacement mechanism comprises a stepper motor.
5. A method of regulation based on a system according to any one of claims 1-3, characterized in that it comprises the following steps:
obtaining a phase difference value of laser beams emitted by the laser after entering the speckle elimination device and dividing the laser beams into two beams according to the size parameters of the speckle elimination device and the current relative position of the speckle elimination device and the laser;
and comparing the phase difference value with a first preset value, and taking the comparison result as a basis for adjusting the displacement distance of the speckle eliminating device in the direction vertical to the emergent light path of the laser.
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| CN201810930432.0A CN109031687B (en) | 2018-08-15 | 2018-08-15 | System and method for adjusting speckle-dissipating laser light source |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201804162U (en) * | 2010-08-03 | 2011-04-20 | 福州高意通讯有限公司 | Laser projection displaying system with speckle removal |
| CN103134439A (en) * | 2013-01-29 | 2013-06-05 | 天津大学 | Double-rotation optical wedge space phase shift method used for cutting speckle interference |
| CN108007677A (en) * | 2017-12-27 | 2018-05-08 | 杭州远方光电信息股份有限公司 | A kind of laser projection speckle measurement system |
| CN108051976A (en) * | 2017-12-29 | 2018-05-18 | 深圳市时代华影科技股份有限公司 | The laser projection device and system of speckle can be eliminated |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8395714B2 (en) * | 2009-04-16 | 2013-03-12 | Microvision, Inc. | Scanned projection system using polymerized liquid crystal layer for speckle reduction |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201804162U (en) * | 2010-08-03 | 2011-04-20 | 福州高意通讯有限公司 | Laser projection displaying system with speckle removal |
| CN103134439A (en) * | 2013-01-29 | 2013-06-05 | 天津大学 | Double-rotation optical wedge space phase shift method used for cutting speckle interference |
| CN108007677A (en) * | 2017-12-27 | 2018-05-08 | 杭州远方光电信息股份有限公司 | A kind of laser projection speckle measurement system |
| CN108051976A (en) * | 2017-12-29 | 2018-05-18 | 深圳市时代华影科技股份有限公司 | The laser projection device and system of speckle can be eliminated |
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