CN202938985U

CN202938985U - Strip-shaped light source illuminance distribution detecting device based on linear array CCD camera

Info

Publication number: CN202938985U
Application number: CN 201220611340
Authority: CN
Inventors: 朱均超; 张宝峰; 刘娜
Original assignee: Tianjin University of Technology
Current assignee: Tianjin University of Technology
Priority date: 2012-11-19
Filing date: 2012-11-19
Publication date: 2013-05-15
Anticipated expiration: 2022-11-19

Abstract

The utility model relates to a strip-shaped light source illuminance distribution detecting device based on a linear array CCD camera. The device comprises a testboard 7, a rotating light source 1, a conveyor belt 2, a CCD camera 3, two stepping motors 4, a rotary drum 5 and a computer 6. A light source to be tested can rotate at 360 degrees, the CCD camera which can move leftwards and rightwards is mounted opposite to the light source to be tested and used for acquiring illuminance images and inputting acquired signals into the computer for processing, and finally an analysis result of the light source is shown in the form of a diagram, a curve, a three-dimensional diagram and the like. The device has the advantages of easy operation and low price. Processing is directly performed by the computer, and the test result is genuine and believable. Thus a standard test device is manufactured, realizing automation of a test.

Description

Strip source Illumination Distribution pick-up unit based on linear array CCD camera

Technical field

The utility model relates to machine vision and optical engineering technical field, for detection of the Illumination Distribution consistance of strip source.

Technical background

In Vision Builder for Automated Inspection, lighting source is one of part of system core, is directly connected to entire system performance index, or even the success or failure of system, in any case that its importance is emphasized is not at all.The lighting source of high-quality can improve the picture quality of collection, increases contrast and the signal to noise ratio (S/N ratio) of image, for image processing algorithm provides good precondition.Be typical Vision Builder for Automated Inspection as Fig. 1.

Strip source is a kind of Ordinary Light Sources Have in the line-scan digital camera detection system, generally adopts fluorescent light or LED array to combine, and has brightness and the characteristics such as concentrates, and is convenient to be used in conjunction with line-scan digital camera.But due to reasons such as manufacturing and processing technologys, there is certain difference in the illumination of strip source, if do not processed, can affect final image acquisition effect.So strip source illumination consistance is carried out necessary check, just seems particularly important.

Light illumination distributes to detect and mainly contains two kinds of methods at present, and a kind of is the method for integrating sphere, and its advantage is farthest to have received to diffuse, and eliminates the impact that some shakes cause.But there is following shortcoming in it: the one, to circuit require highly, need a plurality of power amplifiers, its complex structure, cost is high; The 2nd, the optical energy utilization efficiency of integrating sphere lighting system is lower, when reaching higher illuminance, usually need a plurality of high power light sources, the large heat of its generation, lamp, Lamp cup and lamp socket thermotolerance are had relatively high expectations, and the working time is unsuitable long, and low-light (level) realizes that difficulty is large, under hot conditions, lamp life is shorter; The 3rd, adapt to product optics heavy caliber illumination photometry, the window of integrating sphere also will correspondingly become greatly, and in order to reach the effect of Uniform Illumination, the volume of integrating sphere will become greatly, and the quantity of input window increases, and efficient can reduce; The 4th, along with integrating sphere increases service time, integrating sphere inside coating reflection efficiency can descend to some extent.Another kind is to adopt illuminometer to measure, and artificial point-to-point measurement and multi-spots way are arranged.Its advantage is low for equipment requirements, low price.But the point-to-point measurement method needs each reading, complicated operation, and efficient is very low.And its reading generally adopts manual type, and is easily tired, also introduced uncertain factor simultaneously.Multi-spots way has been accelerated speed with respect to point-to-point measurement, but when measured zone or face visual field, also needs repeatedly to measure the detection that just can complete a light source, inefficiency.

Summary of the invention

The purpose of this utility model is to solve the difficult problem that light illumination distributes and detects, and the strip source Illumination Distribution pick-up unit of a cover based on linear array CCD camera is provided.

The strip source Illumination Distribution pick-up unit based on linear array CCD camera that the utility model provides comprises test board, rotation light source, travelling belt, CCD camera, two stepper motors, rotary drum and computing machine; Travelling belt is arranged on test board by rotary drum, rotary drum is connected with step motor shaft on being arranged on test board, the CCD camera is fixed on travelling belt, and the rotation light source is connected with another step motor shaft and is arranged on test board, and the output of CCD camera is connected with computing machine.

Pick-up unit is controlled movement, the rotating acquisition light source multiposition of light source, the multi-angle illuminance information of camera as shown in Figure 2 by coordination.On computers the information that gathers is analyzed and processed, thereby detect the illumination consistance of this light source.The signal of light illumination detection architecture as shown in Figure 3.

Innovative point of the present utility model and advantage:

1, adopt machine vision that the illumination of light source is detected, overcome that the accuracy rate that traditional employing photometer detects is not high, the disadvantage of inefficiency, complicated operation.This device adopts the luminous energy distributed image of CCD camera picked-up measured light, and view data is converted into definite shading value after measuring system software is processed, obtain faster the luminous energy distribution situation on measured light, thereby realized fast detecting.

2, because this device is that the illumination in 360 ° of scopes of light source is detected, and whole process all completed by computing machine, and is easy to operate, realized test automation, and the real result that therefore detects is credible.

3, detect different from existing light illumination, this device is not only to detect a kind of single light source type, it can detect the light source of number of different types, different purposes, and the light illumination distribution results that detects can be represented with forms such as chart, curve, three-dimensional plot.

Description of drawings

Fig. 1 is Vision Builder for Automated Inspection figure.

Fig. 2 is based on the strip source Illumination Distribution pick-up unit of linear array CCD camera.

Fig. 3 light illumination detection system structural representation.

In figure, the 1st, rotation light source, the 2nd, travelling belt, the 3rd, CCD camera, the 4th, stepper motor, the 5th, rotary drum, the 6th, computing machine, the 7th, test board.

Embodiment

As shown in Figure 2, the strip source Illumination Distribution pick-up unit based on linear array CCD camera that the utility model provides comprises test board 7, rotation light source 1, travelling belt 2,3, two stepper motors 4 of CCD camera, rotary drum 5 and computing machine 6; Travelling belt is arranged on test board by rotary drum, rotary drum is connected with step motor shaft on being arranged on test board, the CCD camera is fixed on travelling belt, and the rotation light source is connected with another step motor shaft and is arranged on test board, and the output of CCD camera is connected with computing machine.

The utility model pick-up unit formant can be divided into:

(1) light illumination collecting unit: ccd video camera moves with stepper motor, gathers the monochrome information on light source, and after every collection once, light source turns an angle, and video camera continues to gather, until collect the illuminance information in 360 ° of scopes of light source.Adopt A/D converter to the CCD collected by camera to signal change, make the signal of simulation be transformed to digital signal, carry out data for processor and process.

(2) motion control unit: under computer control, at the uniform velocity move synchronous acquisition image in mobile by stepper motor A driven CCD camera along the strip source axial direction.After completing an angle scanning, Driving Stepping Motor B rotates fixed angle, and then control step motor A carries out scanning next time.Whole motion process is directly controlled by computing machine.

(3) illumination identification and analytic unit: this module operation after collecting the light source image of multi-angle, is analyzed and is processed it in computing machine on computers, analyzes the illuminance information of diverse location, different angles.Utilize the forms such as chart, curve, three-dimensional plot to represent the analysis result of this light source on screen.

Use procedure of the present utility model:

When carrying out the light illumination test experience, utilize the utility model device to detect the each point illuminance information, and show each point illuminance information oscillogram on display.Embodiment is:

1) stepper motor is installed on operating platform, light source, CCD camera are installed firmly, be connected with stepper motor, in order to it is controlled.Stepper motor is connected with computing machine, completes the installment work of package unit.

2) adjust CCD lens focus and field range, can be accurately complete collection illuminance information.

3) install after, by computing machine, modules is debugged and the initialization setting, guarantee to detect camera before beginning on the limit of travelling belt.

4) collection of image under computer control, is at the uniform velocity moved along the strip source axial direction by stepper motor A driven CCD camera, synchronous acquisition image in mobile.After completing an angle scanning, Driving Stepping Motor B rotates fixed angle, and then control step motor A carries out scanning next time, until 360 ° of scope internal informations of light source have been gathered.

5) the CCD camera under the driving of stepper motor, enters computing machine after the illuminance information of collection process A/D conversion and carries out identifying processing.

6) computing machine emission initialization command is to unit.After each unit receives orders, carry out the acquisition and processing of illumination image.Process illuminance information in computing machine, it is depicted as the forms such as chart, curve, three-dimensional plot, the homogeneity of observation illumination.

7) be according to Treatment Analysis, the graphical demonstration at last, show each point light illumination waveform on display.

Claims

1. the strip source Illumination Distribution pick-up unit based on linear array CCD camera, is characterized in that this device comprises test board, rotation light source, travelling belt, CCD camera, two stepper motors, rotary drum and computing machine; Travelling belt is arranged on test board by rotary drum, rotary drum is connected with step motor shaft on being arranged on test board, the CCD camera is fixed on travelling belt, and the rotation light source is connected with another step motor shaft and is arranged on test board, and the output of CCD camera is connected with computing machine.