CN110440693B - Quasi-optical feed network system and error testing method - Google Patents
Quasi-optical feed network system and error testing method Download PDFInfo
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Abstract
The application provides a quasi-optical feed network system, which comprises a common reference frame, a quasi-optical feed network subsystem and a calibration subsystem, wherein the common reference frame is an assembly reference of the quasi-optical feed network subsystem and the calibration subsystem; the quasi-optical feed network subsystem is integrated in a quasi-optical frame, and the quasi-optical frame is fixedly connected with a common reference frame; the calibration subsystem is integrated in a calibration frame, and the calibration frame is fixedly connected with the common reference frame; the assembly accuracy detection of the quasi-optical feed network system uses a laser tracker for measuring three orthogonal reference planes on a common reference frame to establish a measurement coordinate system, respectively measuring three orthogonal reference planes formed by prism groups on a quasi-optical frame and a calibration frame to establish a quasi-optical frame coordinate system and a calibration frame coordinate system in sequence, and judging assembly errors through the position relation of the quasi-optical frame coordinate system and the measurement coordinate system.
Description
Technical Field
The invention relates to the technical field of integrated assembly precision detection of aerospace products, in particular to a quasi-optical feed network system and an error testing method.
Background
The quasi-optical feed network is the most important component of the next generation meteorological satellite detector payload in China, and mainly comprises a quasi-optical light path system, namely a quasi-optical feed network and a calibration system. The quasi-optical feed network is a mode of arranging quasi-optical devices according to a certain spatial position relation to realize multi-band simultaneous feed, and has the advantages of high transmission efficiency, small insertion loss, multi-channel multi-polarization, confocal and co-visual axes and the like.
In the prior art, the assembly accuracy of a quasi-optical feed network system is detected by taking a single prism as a measurement reference, replacing the surface with points, and having large measurement error and low assembly accuracy; the disassembly, assembly and adjustment of the subsystem are inconvenient, and the secondary recovery positioning precision is not high.
Disclosure of Invention
Aiming at the defects in the prior art, the embodiment of the application provides a quasi-optical feed network system and an error testing method. The technical scheme is as follows:
according to an aspect of an embodiment of the present application, there is provided a quasi-optical feed network system, the system including a common reference frame, a quasi-optical feed network subsystem, and a scaling subsystem, the common reference frame being an assembly reference of the quasi-optical feed network subsystem and the scaling subsystem;
the quasi-optical feed network subsystem is integrated in a quasi-optical frame, and the quasi-optical frame is fixedly connected with the common reference frame;
the calibration subsystem is integrated in a calibration frame, and the calibration frame is fixedly connected with the common reference frame;
the assembly precision detection of the quasi-optical feed network system uses a laser tracker for measuring three orthogonal reference planes on the common reference frame to establish a measurement coordinate system, sequentially establishes a quasi-optical frame coordinate system and a calibration frame coordinate system by measuring three orthogonal reference planes formed by a prism group on the quasi-optical frame and the calibration frame respectively, and judges assembly errors according to the position relation between the quasi-optical frame coordinate system and the measurement coordinate system.
In one possible implementation, the collimating frame and the scaling frame each have a prism set, and each prism set is composed of a plurality of prisms.
In one possible implementation manner, the prism group includes at least four prisms, the prisms are installed in the same plane, and the side surface normal directions corresponding to the prisms constituting the prism group are the same.
In one possible implementation mode, at least three prism body center position connecting lines in the prism group form a right triangle.
In one possible implementation manner, the prism group on the collimating frame is composed of 5 prisms, the theoretical heights of five prisms are consistent, and the normal directions of corresponding surfaces are consistent, wherein four prisms are distributed according to a rectangle, the body centers of the prisms are located at the top points of the rectangle, and one prism is located inside the rectangle.
In one possible implementation manner, the calibration frame prism group includes four prisms with the same theoretical height and the same corresponding surface normal direction, three of the four prisms form two sides of a rectangle, and the fourth prism is located on the third side of the rectangle.
According to another aspect of the embodiments of the present application, there is provided an error testing method for a quasi-optical feed network system, the system includes a common reference frame, a quasi-optical feed network subsystem, and a scaling subsystem, where the common reference frame is an assembly reference of the quasi-optical feed network subsystem and the scaling subsystem; the collimating frame and the calibration frame are respectively provided with a prism group, and each prism group consists of a plurality of prisms;
the method comprises at least the following steps:
s101, selecting three orthogonal reference surfaces A, B, C on a common reference frame as measurement objects, collecting measurement points on the three surfaces respectively by using a laser tracker, and establishing a reference coordinate system;
s102, selecting a prism group on a quasi-optical frame as a measurement object, and establishing a quasi-optical frame coordinate system;
s103, selecting a prism group on a calibration frame as a measurement object, and establishing a calibration frame coordinate system;
and step S104, superposing a reference coordinate system established by actual measurement with a theoretical reference coordinate system, and comparing a standard light frame and a calibration frame standard system obtained by actual measurement with the corresponding theoretical coordinate systems respectively to obtain an assembly error and the rotation angle and displacement deviation of the coordinate axes.
In a possible implementation manner, in the step S101, three orthogonal reference planes A, B, C on a common reference frame are selected as measurement objects, a laser tracker is used to collect 8-10 measurement points on the three planes respectively, a least square method is used to fit planes a ', B ', and C ', intersection points of the three planes are used as coordinate origin points, and a reference coordinate system O is established by using normal directions of the planes a ' and B ' as Z, X axes0-X0Y0Z0。
In a possible implementation manner, in step S102, measuring points are collected on top surfaces of 5 prisms in the prism group by using a laser tracker, and the plane a is fitted by using a least square methodzPlane BzAnd plane CzIn the plane Az、Bz、CzThe intersection point of (A) is the origin of coordinates OzThe normal directions of Bz and Cz are taken as XzAxis and YzAxis, establishing a quasi-optical frame coordinate system Oz-XzYzCz。
In a possible implementation manner, in step S103, measuring points are collected on top surfaces of four prisms of the prism group respectively by using a laser tracker, and at least four measuring points are collected on each prism surface, and a least square method is adopted to fit the plane adPlane BdAnd plane CdIn the plane Ad、Bd、CdThe intersection point of (A) is the origin of coordinates, respectively Bd、CdNormal direction of (A) is XdAxis and YdAxis, establishing a calibration frame 3 coordinate system Od-XdYdCd。
In one possible implementation manner, in the step S104, a quasi-optical frame is taken as an example. Actual measured quasi-optical frame coordinate system Oz-XzYzCzThe coordinates (X, Y, Z) in its theoretical coordinate system are the translation errors. While the corner error between the coordinate axes can be obtained by a transformation matrix M of the Euler transform, i.e.
Wherein, alpha, beta and gamma are included angles between corresponding coordinate axes respectively.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the quasi-optical feed network provided by the application consists of three parts, namely a common reference frame, a quasi-optical frame and a calibration frame. Wherein, the common reference frame is used as the assembly positioning reference of the quasi-optical frame and the calibration frame. The quasi-optical frame comprises an independent quasi-optical feed network subsystem, and the relative position relation between each quasi-optical element of the quasi-optical feed network subsystem and the measuring reference of the calibration frame is checked and kept unchanged. The calibration frame comprises independent calibration subsystems, and the relative position relation between each calibration component and the measurement reference of the calibration frame is checked and kept unchanged. The assembling precision between the quasi-optical feed network system and the calibration system is the assembling precision between the quasi-optical frame and the calibration frame and the common reference frame. The method simplifies the assembly precision of originally complex components into the assembly precision of independent subsystems, increases the flexibility and is convenient for the disassembly, assembly and debugging of the independent subsystems.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a quasi-optical feed network system according to an exemplary embodiment of the present application;
FIG. 2 is a schematic diagram of the positions of prisms of a quasi-optical frame backplane prism assembly provided by an exemplary embodiment of the present application;
fig. 3 is a flowchart of an error testing method of a quasi-optical feed network system according to an exemplary embodiment of the present application;
in the figure:
1 is a common reference frame
2 is a frame of collimating light
3 is a calibration frame
4 is a common reference frame front reference surface
5 is a common reference frame left side reference surface
6 is a common reference frame upper side reference surface
7 is a base plate prism a of the standard light frame
8 is a base plate prism b of a standard light frame
9 is a collimating frame mounting bottom plate prism c
10 is a standard light frame mounting bottom plate prism d
11 is a base plate prism e of a standard light frame
12 is a scaling frame prism
13 is a calibration frame prism b
14 is a calibration frame prism c
15 is a calibration frame prism d
16 is the top surface of the base plate prism a of the standard light frame installation
17 is the left side surface of the base plate prism a of the standard light frame
18 is the upper side of the base plate prism a of the standard light frame installation
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The application provides a quasi-optical feed network system, which comprises a common reference frame, a quasi-optical feed network subsystem and a calibration subsystem, wherein the common reference frame is an assembly reference of the quasi-optical feed network subsystem and the calibration subsystem; the quasi-optical feed network subsystem is integrated in a quasi-optical frame, and the quasi-optical frame is fixedly connected with a common reference frame; the calibration subsystem is integrated in a calibration frame, and the calibration frame is fixedly connected with the common reference frame; the assembly accuracy detection of the quasi-optical feed network system uses a laser tracker for measuring three orthogonal reference planes on a common reference frame to establish a measurement coordinate system, respectively measuring three orthogonal reference planes formed by prism groups on a quasi-optical frame and a calibration frame to establish a quasi-optical frame coordinate system and a calibration frame coordinate system in sequence, and judging assembly errors through the position relation of the quasi-optical frame coordinate system and the measurement coordinate system.
The quasi-optical feed network provided by the application consists of three parts, namely a common reference frame, a quasi-optical frame and a calibration frame. Wherein, the common reference frame is used as the assembly positioning reference of the quasi-optical frame and the calibration frame. The quasi-optical frame comprises an independent quasi-optical feed network subsystem, and the relative position relation between each quasi-optical element of the quasi-optical feed network subsystem and the measuring reference of the calibration frame is checked and kept unchanged. The calibration frame comprises independent calibration subsystems, and the relative position relation between each calibration component and the measurement reference of the calibration frame is checked and kept unchanged. The assembling precision between the quasi-optical feed network system and the calibration system is the assembling precision between the quasi-optical frame and the calibration frame and the common reference frame. The method simplifies the assembly precision of originally complex components into the assembly precision of independent subsystems, increases the flexibility and is convenient for the disassembly, assembly and debugging of the independent subsystems.
The present application is described in further detail below with reference to figures 1 and 2.
Fig. 1 shows a block diagram of a quasi-optical feed network system provided in an exemplary embodiment of the present application, which includes a co-reference frame, a quasi-optical feed network subsystem, and a scaling subsystem. The common reference frame 1 is an assembly reference of the quasi-optical feed network subsystem and the calibration subsystem, and provides an interface for externally mounting the quasi-optical feed network and the calibration system.
The quasi-optical feed network subsystem is integrated in the quasi-optical frame 2, and all quasi-optical components are connected with the quasi-optical frame mounting base plate and connected with the common reference frame 1 through the quasi-optical frame.
The targeting subsystem includes at least a rotating scan mirror and drive mechanism, integrated within the targeting frame 3 and connected to the common reference frame 1 through the targeting frame. Three orthogonal reference planes on a common reference frame are measured by using a laser tracker to establish a measurement coordinate system. The collimating frame 2 and the scaling frame 3 each have a prism group, and each prism group is composed of a plurality of prisms. During measurement, a plane formed by a plurality of prisms of the prism group replaces a small plane of a single prism, three orthogonal planes formed by the prism group are measured by using a laser tracker, a quasi-optical frame coordinate system and a calibration frame coordinate system are respectively established, and assembly errors are judged according to the position relation between the quasi-optical frame coordinate system and the calibration frame coordinate system.
The prism group is composed of at least four prisms, and all the prisms are arranged in the same plane, namely the theoretical height values of the prisms are consistent. Meanwhile, the corresponding side surface normal directions of all prisms forming the prism group are consistent. Meanwhile, at least three prism center positions in the prism group are connected to form a right triangle. In an exemplary embodiment, the prism group of the collimating frame 2 is composed of five prisms, the theoretical heights of the five prisms are consistent, the normal directions of the corresponding surfaces are consistent, four prisms are distributed according to a rectangle, the prism body centers are positioned at the top points of the rectangle, and one prism is positioned inside the rectangle. The prism group of the scaling frame 3 comprises four prisms with the same theoretical height and the same corresponding surface normal direction, wherein three prisms form two sides of a rectangle, and the fourth prism is positioned on the third side of the rectangle.
The common reference frame provided by the application is used as an assembly positioning reference of the quasi-optical feed network subsystem and the calibration subsystem. The quasi-optical feed network subsystem is integrated in the quasi-optical frame and assembled with the common reference frame through the quasi-optical frame. All the quasi-optical devices are installed on the quasi-optical frame installation bottom plate, and the position relations among the quasi-optical devices and the quasi-optical frame measurement reference are calibrated and calibrated. The calibration subsystem is integrated in the calibration frame, and the relative position relationship between each calibration component and the measurement reference of the calibration frame is calibrated and calibrated. The scaling subsystem is assembled with the common reference frame by the scaling frame. Therefore, the assembling precision between the quasi-optical feed network system and the calibration system is the assembling precision between the quasi-optical frame and the calibration frame and the common reference frame. Because the quasi-optical feed network subsystem and the calibration subsystem are integrated by taking the common reference frame as an assembly reference, on one hand, the assembly flexibility of the subsystems and the independent test of the systems can be improved, and the assembly difficulty is reduced. In addition, when the satellite is assembled with the whole satellite, the common reference frame is used as a carrier, the assembling and adjusting efficiency can be improved, and the problems of shielding of a measuring instrument test field and the like are effectively avoided.
The present application further provides an error testing method for a quasi-optical feed network system, and with reference to fig. 3, fig. 3 shows a flowchart of the error testing method for the quasi-optical feed network system according to an exemplary embodiment of the present application, and based on the above embodiment, the method specifically includes the following steps:
s101, selecting three orthogonal reference surfaces A, B, C on a common reference frame as measurement objects, collecting measurement points on the three surfaces respectively by using a laser tracker, and establishing a reference coordinate system;
s102, selecting a prism group on a quasi-optical frame as a measurement object, and establishing a quasi-optical frame coordinate system;
s103, selecting a prism group on a calibration frame as a measurement object, and establishing a calibration frame coordinate system;
and step S104, superposing a reference coordinate system established by actual measurement with a theoretical reference coordinate system, and comparing a standard light frame and a calibration frame standard system obtained by actual measurement with the corresponding theoretical coordinate systems respectively to obtain an assembly error and the rotation angle and displacement deviation of the coordinate axes.
Specifically, the steps include the following:
(1) establishing a reference coordinate system
Three orthogonal reference surfaces A, B, C on the common reference frame 1 are selected as measuring objects, a laser tracker is used for collecting 8-10 measuring points on the three surfaces respectively, and the least square method is adopted to respectively fit the planes A ', B ' and C '. Establishing a reference coordinate system O by taking the intersection point of the three planes as the origin of coordinates and the normal directions of the planes A 'and B' as Z, X axes0-X0Y0Z0。
(2) Establishing a quasi-optical frame coordinate system
The prism group on the collimating optical frame 2 is selected as a measuring object. Measuring points are respectively collected on the top surfaces of five prisms of the prism group by using a laser tracker, each prism surface collects at least four measuring points, the top surface of the whole prism group collects at least 20 measuring points, and a least square method is adopted to fit a plane Az. Selecting the left side surfaces of a prism 7 and a prism 8 in the prism group to respectively collect at least four measuring points, collecting at least eight measuring points on the side surface of the whole prism group, and fitting a plane B by adopting a least square methodz. Selecting the upper sides of the prisms 7 and 10 in the prism group to respectively collect at least four measuring points, collecting at least eight measuring points on the side of the whole prism group, and fitting a plane C by adopting a least square methodz. In a plane Az、Bz、CzThe intersection point of (A) is the origin of coordinates, respectively Bz、CzNormal direction of (A) is XzAxis and YzAxis, establishing a quasi-optical frame coordinate system Oz-XzYzCz。
(3) Establishing a calibration frame coordinate system
And selecting the prism group on the calibration frame 3 as a measurement object. Measuring points are collected on the top surfaces of four prisms of a prism group by using a laser tracker, at least four measuring points are collected on each prism surface, at least 16 measuring points are collected on the top surface of the whole prism group, and a least square method is adopted to fit a plane Ad. Selecting the left side surfaces of a prism 12 and a prism 13 in the prism group to respectively collect at least four measuring points, collecting at least eight measuring points on the side surface of the whole prism group, and fitting a plane B by adopting a least square methodd. Selecting the upper sides of the prisms 12 and 15 in the prism group to respectively collect at least four measuring points, collecting at least eight measuring points on the side of the whole prism group, and fitting a plane C by adopting a least square methodd. In a plane Ad、Bd、CdThe intersection point of (A) is the origin of coordinates, respectively Bd、CdNormal direction of (A) is XdAxis and YdAxis, establishing a calibration frame 3 coordinate system Od-XdYdCd。
(4) Assembly error analysis
A reference coordinate system O established by actual measurement0-X0Y0Z0Coinciding with the theoretical reference coordinate system, and actually measuring the obtained quasi-optical frame Oz-XzYzCzAnd scaling frame mark system Od-XdYdZdAnd respectively obtaining the deviation of the rotation angle and the displacement of each coordinate axis through the coordinate system rotation matrix, wherein the deviation between the theoretical coordinate system and the corresponding coordinate system is the assembly error.
Take a quasi-optical frame as an example. Actual measured quasi-optical frame coordinate system Oz-XzYzCzThe coordinates (X, Y, Z) in its theoretical coordinate system are the translation errors. While the corner error between the coordinate axes can be obtained by a transformation matrix M of the Euler transform, i.e.
Wherein, alpha, beta and gamma are included angles between corresponding coordinate axes respectively.
In summary, the advantages of the assembly accuracy detection method at least include:
1. the method is simple and efficient. The method only needs one laser tracker to be matched with the prism for use, and the assembly precision detection is realized. In the measuring process, the laser tracker respectively collects points of three orthogonal surfaces of the prism, and then a coordinate system is established by taking the intersection point of the orthogonal fitting planes as a coordinate origin and the normal direction of the fitting planes as a coordinate axis through a multi-point fitting plane. The method does not need to measure the face center position of the prism. In the traditional measuring method, a prism is usually matched with a plurality of theodolites for use, the surface center of two adjacent orthogonal surfaces of the prism is measured by the principle of intersection of the front parts of the two theodolites, and then the measured value is retracted into the prism by a specific value according to the specification of the prism to confirm the body center position of the prism and establish a coordinate system. Therefore, the traditional measuring method is complicated in process and low in measuring efficiency.
2. The method uses the prism group to replace a single prism, and the measuring structure is more real and reliable. In the conventional measurement method, a single prism is usually used to establish a measurement coordinate system, or the surface normal direction of a measured product is replaced by the surface normal direction of the single prism. This method is liable to cause a large measurement error corresponding to a large-sized measurement object. In the measuring method, the prism groups are formed on the measured object through the reasonable layout of the prisms, and the prism groups are respectively arranged on the surface of the measured object to the maximum extent. The top surfaces of all prisms in the prism group have the same theoretical height, and the side surfaces of the prisms are coplanar respectively. Taking the quasi-optical frame mounting base plate prism group as an example, the prisms a-d are close to four vertexes of the rectangular mounting base plate, and the prism e is positioned inside the rectangular mounting base plate. The plane fitted by the five prism top surface measuring points can reflect the normal direction of the standard light frame mounting base plate more truly. And the measuring plane fitted by the left side surfaces of the prism a and the prism b and the measuring plane fitted by the upper side surfaces of the prism a and the prism d are equivalent to the original single prism side surface, so that the actual size magnitude of a measured product is expanded, and the method is more real and reliable.
3. The measuring method has high measuring precision. First, the accuracy of the measuring device itself is higher. Compared with the traditional method of using the theodolite to measure the prism, the laser tracker has better measurement precision and can realize the measurement precision of less than 1 mu m/m. Secondly, the man-made interference factor in the measuring process is smaller. In the traditional measuring method, a plurality of theodolites are operated by different personnel, aiming points are observed by visual observation, and measuring errors are easily introduced by different operation modes and measuring habits. The laser tracker automatically tracks and collects the center position of the handle ball by the laser beam in the measuring process, thereby reducing the human interference factor to the maximum extent.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
It should be understood that reference to "a plurality" herein means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (11)
1. A quasi-optical feed network system is characterized by comprising a common reference frame, a quasi-optical feed network subsystem and a scaling subsystem, wherein the common reference frame is an assembly reference of the quasi-optical feed network subsystem and the scaling subsystem;
the quasi-optical feed network subsystem is integrated in a quasi-optical frame, and the quasi-optical frame is fixedly connected with the common reference frame;
the calibration subsystem is integrated in a calibration frame, and the calibration frame is fixedly connected with the common reference frame;
the assembly precision detection of the quasi-optical feed network system uses a laser tracker for measuring three orthogonal reference planes on the common reference frame to establish a measurement coordinate system, sequentially establishes a quasi-optical frame coordinate system and a calibration frame coordinate system by measuring three orthogonal reference planes formed by a prism group on the quasi-optical frame and the calibration frame respectively, and judges assembly errors according to the position relation between the quasi-optical frame coordinate system and the measurement coordinate system.
2. The system of claim 1, wherein said collimating frame and said scaling frame each have a prism group, each of said prism groups comprising a plurality of prisms.
3. The system of claim 2, wherein the prism group comprises at least four prisms, the prisms are mounted in the same plane, and the side normal directions of the prisms corresponding to the prisms constituting the prism group are the same.
4. The system of claim 3, wherein at least three prism center positions of the prism group are connected to form a right triangle.
5. The system according to any one of claims 1 to 4, wherein the prism group on the collimating frame is composed of five prisms, the theoretical heights of the five prisms are consistent, the normal directions of the corresponding surfaces are consistent, four prisms are distributed according to a rectangle, the centers of the prisms are located at the top points of the rectangle, and one prism is located inside the rectangle.
6. The system of any of claims 1 to 4, wherein the scaled frame prism assembly comprises four prisms of uniform theoretical height and uniform corresponding to a surface normal orientation, three of which form two sides of a rectangle, and a fourth prism located on a third side of the rectangle.
7. The error testing method of the quasi-optical feed network system is characterized in that the system comprises a common reference frame, a quasi-optical feed network subsystem and a calibration subsystem, wherein the common reference frame is an assembly reference of the quasi-optical feed network subsystem and the calibration subsystem; the collimating frame and the calibration frame are respectively provided with a prism group, and each prism group consists of a plurality of prisms;
the method comprises at least the following steps:
s101, selecting three orthogonal reference surfaces A, B, C on a common reference frame as measurement objects, collecting measurement points on the three surfaces respectively by using a laser tracker, and establishing a reference coordinate system;
s102, selecting a prism group on a quasi-optical frame as a measurement object, and establishing a quasi-optical frame coordinate system;
s103, selecting a prism group on a calibration frame as a measurement object, and establishing a calibration frame coordinate system;
and step S104, superposing a reference coordinate system established by actual measurement with a theoretical reference coordinate system, and comparing a standard light frame and a calibration frame standard system obtained by actual measurement with the corresponding theoretical coordinate systems respectively to obtain an assembly error and the rotation angle and displacement deviation of the coordinate axes.
8. The method according to claim 7, wherein in step S101, three orthogonal reference planes A, B, C on the common reference frame are selected as measuring objects, the laser tracker collects 8-10 measuring points on the three planes respectively, and the least square method is used to fit the planes a ', B ', C ' respectively, and a reference coordinate system O is established with the intersection point of the three planes as the origin of coordinates and the normal direction of the planes a ', B ' as Z, X axes0-X0Y0Z0。
9. The method of claim 7, wherein in step S102, the laser tracker is used to collect the measuring points on the top surfaces of five prisms in the prism group, and the least square method is used to fit the plane AzPlane BzAnd plane CzIn the plane Az、Bz、CzThe intersection point of (A) is the origin of coordinates OzThe normal directions of Bz and Cz are taken as XzAxis and YzShaft, constructionVertical collimating optical frame coordinate system Oz-XzYzCz。
10. The method of claim 7, wherein in step S103, measuring points are collected on the top surfaces of four prisms of the prism group respectively by using a laser tracker, not less than four measuring points are collected on each prism surface, and the least square method is adopted to fit the plane AdPlane BdAnd plane CdIn the plane Ad、Bd、CdThe intersection point of (A) is the origin of coordinates, respectively Bd、CdNormal direction of (A) is XdAxis and YdAxis, establishing a calibration frame 3 coordinate system Od-XdYdCd。
11. The method of claim 7, wherein in step S104, the actual measured quasi-optical frame coordinate system Oz-XzYzCzThe coordinates (X, Y, Z) in its theoretical coordinate system are the displacement deviations, while the corner deviations between coordinate axes can be obtained by a transformation matrix M of the euler transform, i.e.
Wherein, alpha, beta and gamma are included angles between corresponding coordinate axes respectively.
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