CN113432839B - System and method for comprehensively testing image quality of low-light-level image intensifier - Google Patents
System and method for comprehensively testing image quality of low-light-level image intensifier Download PDFInfo
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- CN113432839B CN113432839B CN202110641391.5A CN202110641391A CN113432839B CN 113432839 B CN113432839 B CN 113432839B CN 202110641391 A CN202110641391 A CN 202110641391A CN 113432839 B CN113432839 B CN 113432839B
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Abstract
The invention relates to a system and a method for comprehensively testing the image quality of a low-light-level image intensifier. The method comprises the following steps: detecting defects and multifilaments in an image intensifier, detecting the cathode effective diameter, resolution and snake distortion of the image intensifier, detecting the shearing distortion of the image intensifier, detecting the anode effective diameter of the image intensifier, detecting the anode uniformity and background of the image intensifier and calibrating. The invention changes the horizontal light path into the vertical light path, can automatically test the image quality comprehensive performance parameters, is beneficial to automatically mounting and taking off the image intensifier by using the robot gas finger, improves the testing efficiency of the image intensifier, and has the characteristics of convenient operation, reduced manual load, high reliability and the like.
Description
Technical Field
The invention relates to the field of image intensifier testing, in particular to a system and a method for comprehensively testing the image quality of a low-light-level image intensifier.
Background
The image intensifier is a core device of low-light night vision equipment and can intensify weak light to enough brightness so as to be convenient for human eyes to observe. The image quality of the image intensifier is an important index for measuring the imaging definition of the image intensifier in a normal use environment, and the method is used for judging and evaluating performance parameters such as image defects, output image uniformity, output resolution, effective diameter, image distortion and the like of the image intensifier at one time, so that the real quality of the output image of the low-light-level image intensifier can be quickly and accurately evaluated.
In the current image quality test of an image intensifier, various test items are separated on different test equipment, the test equipment mainly comprises a resolution tester, a uniformity tester, a visual tester and the like, and the content of the test on the visual tester comprises items such as defect detection, multifilament detection, distortion detection, effective diameter detection, background detection, damage detection and the like. During testing, the image intensifier is required to work under a radiation pattern with specified precision in a darkroom environment, and generally, an optical system of each testing station is horizontally arranged and mainly comprises a light source, an optical projection system, a darkroom system, a detection and metering system and the like. The test stations are operated manually, mainly because the test system cannot meet the design requirements of automatic control.
In the traditional manual detection method, the definition of manual focusing has subjective difference, certain subjective error also exists during human eye observation and measurement, and a large amount of estimation error exists; because manual operation is carried out in a darkroom, operation, test, record and the like are inconvenient, the operation time is long, the test efficiency is low, quality problems are easy to cause, and the like.
In order to improve the quality control level and the production management level of the image intensifier, automatic upgrading is necessary to be implemented in the testing process, the continuity, standardization, automation, digitization, informatization and intellectualization of the testing process are gradually realized, and the aims of improving the product quality, reducing the labor intensity, improving the production efficiency and increasing the economic benefit are fulfilled.
Because of few research and development units for testing equipment of the low-light-level image intensifier in China, some research institutions in colleges and universities are willing to develop or even only make one part of the testing equipment based on the prior art, and image intensifier test equipment providers in foreign countries including America, Poland and the like are portable test equipment for testing comprehensive performance parameters on the basis of single tests of the low-light-level image intensifier, and multi-parameter tests are integrated on one test equipment, so that the centralized operation and system maintenance are facilitated, but no automatic intelligent test equipment exists. Therefore, it is necessary to perform an automated and intelligent test research on the comprehensive test technology of image quality. And the image chip is used for collecting the output image during the image quality test of the image intensifier, so that the digital, automatic and intelligent test is easy to realize.
Disclosure of Invention
The invention aims to overcome the operation method in the prior art and provide a set of efficient, highly reliable and easily-operated automatic test system to meet the requirements of comprehensive test and calibration of the image quality of the low-light-level image intensifier.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a comprehensive image quality testing system for a low-light-level image intensifier comprises a light source module, an electric target plate switching wheel assembly, a 1:1 projection lens, a program-controlled camera bellows, an electric zoom lens, a detection module, a three-dimensional moving sliding table, a three-dimensional moving mechanism, a light source system camera bellows, an electric cabinet, a program-controlled high-light shadowless light source, an automatic code scanning gun, an electric baffle, an industrial personal computer, a power supply, a controller and the like. The light source module consists of a halogen tungsten lamp mounting seat, a centering diaphragm, a connecting cylinder, an electric shutter, an electric filter wheel assembly, an electric diaphragm, an integrating sphere with an illumination detector and an illumination indicator. The detection module consists of a CCD camera, an sCMOS camera and a semi-transparent semi-reflecting mirror mounting seat. The centers of a light source module, an electric target plate switching wheel assembly, a 1:1 projection lens, a program-controlled camera bellows with an image intensifier, a program-controlled high-illumination shadowless light source, an electric zoom lens, a semi-transparent semi-reflecting mirror mounting seat and an sCMOS camera are positioned on the same axis, the anode surface and the cathode surface of the image intensifier are adjusted and aligned through a three-dimensional moving sliding table and a three-dimensional moving mechanism and focused, and the CCD camera is coupled to an axis light path through a semi-transparent semi-reflecting mirror which is obliquely arranged at an angle of 45 degrees and simultaneously imaged.
The light source module is fixed on the light path mounting bracket, the halogen tungsten lamp is a standard A light source with the color temperature of 2856K, the center of the filament is calibrated through the centering diaphragm, the connecting cylinder and the electric diaphragm are combined to adjust the illumination under the color temperature of 2856K, and the electric shutter can cut off the light path; the electric filter wheel assembly consists of an optical filter electric switching wheel and an attenuation optical filter, the attenuation optical filter has five groups of attenuation multiplying power such as ND3, ND2, ND1.5, ND1, ND0.5 and the like, and the other position is no optical filter, namely empty, when in use, the switching optical filter can obtain the required illumination intensity; the integrating sphere with the illumination detector can uniformly output illumination, and the illumination indicator can display the output illumination value in real time and is mainly used for calibrating the illumination under the color temperature of 2856K.
The electric target plate switching wheel assembly comprises a target plate electric switching wheel and five target plates; the five target plates are respectively composite target plates, three target plates (other installation angles can be provided) are installed at shearing distortion of 0 degree, 60 degrees, 120 degrees and the like, and the target plates are calibrated.
The 1:1 projection lens is used to couple light through the target plate onto the entire cathode surface of the image intensifier.
The program control camera bellows is used for providing relatively independent illumination environment for the image intensifier to be measured, and the lifting of the camera bellows is controlled by a controller of a stepping motor arranged on the program control camera bellows.
The electric zoom lens is used for coupling the optical signal output by the image intensifier to the imaging photoelectric surface of the detection module, and zooming is performed to switch different image acquisition regions.
The detection module switches the CCD camera and the sCMOS camera according to different testing links, and the semi-transparent semi-reflecting mirror which is installed in an inclined mode at 45 degrees couples the two cameras together.
The three-dimensional moving sliding table and the XY axis of the three-dimensional moving mechanism are fixed after being manually adjusted, and the Z axis meets the focusing requirement through program control movement of servo motor controllers arranged on the three-dimensional moving sliding table and the three-dimensional moving mechanism.
The light source system camera bellows provides a camera bellows environment for the light source module and the 1:1 projection lens.
The electrical cabinet is used for mounting a power supply and a controller.
The power supply and controller are used to provide a reliable power supply for the system of the present invention.
The program-controlled high-illumination shadowless light source provides high illumination in the detection process of the image intensifier.
The automatic code scanning gun is used for scanning and identifying the tube number of the image intensifier, and is convenient for recording test data.
The electric baffle is used for preventing dust of the 1:1 projection lens.
The data acquisition module on the industrial personal computer provides a corresponding interface for transmitting and acquiring all data and control signals.
By utilizing the test system, the invention also provides a comprehensive test method for the image quality of the low-light-level image intensifier, which comprises the following steps:
(1) before the comprehensive test of image quality, preheating a halogen tungsten lamp for more than 30 minutes, opening an electric shutter, removing an electric baffle, switching a neutral attenuation filter to be a filter-free filter, detecting the illumination by using an illumination indicator, and adjusting the current value of a power supply of the halogen tungsten lamp to enable the illumination to be a preset calibration value;
(2) adjusting the lamp current of the program-controlled high-illumination shadowless light source, and calibrating the illuminance of the program-controlled high-illumination shadowless light source to be about 2000 lx; after the test shell with the image intensifier is placed at a detection station through a robot finger or a human, the image intensifier is automatically switched on, and a program control camera bellows is operated to a closed state under the control of a program;
(3) the target plate electric switching wheel is switched to a target plate-free position on six hole sites of the target plate electric switching wheel, an electric shutter is opened, an electric baffle is removed, the electric zoom lens is switched to 1 x, and the CCD camera is opened;
(4) and (4) normally outputting image acquisition: monitoring an output image of a CCD camera, checking whether an image intensifier outputs an image or not, moving a Z-direction program control drive three-dimensional moving sliding table and a three-dimensional moving mechanism to focus a clear image on a motor on the three-dimensional moving sliding table and the three-dimensional moving mechanism, checking whether the output image of the image intensifier flickers or not, monitoring whether the current of the image intensifier changes or not, and acquiring a flicker-free image A;
(5) strong light scintillation detection: opening the program-controlled high-illumination shadowless light source, checking whether the output image of the image intensifier flickers or not, monitoring whether the current of the image intensifier changes or not, and collecting an image B without flickers;
(5) and (3) acquiring the anode surface image: at the moment, the power supply of the image intensifier is turned off, and an image C is collected;
(6) processing the image A, B, C to obtain an image D, wherein the image D is processed on the basis of the image A, wherein the image D is the image A n image B n image C (wherein n represents the AND or difference processing of the image pixels), and the image intensifier internal defect and multifilament detection is performed;
(7) turning off the program-controlled high-illumination shadowless light source, turning on a power supply of the image intensifier, switching the target plate electric switching wheel to a composite target plate position on six hole sites of the target plate electric switching wheel, collecting an image E, and detecting the effective cathode diameter, resolution and snake-shaped distortion of the image intensifier;
(8) the target plate electric switching wheel is switched to the positions of 0 degrees, 60 degrees and 120 degrees of the shear distortion target plate arranged on six hole sites of the target plate electric switching wheel, and an image F, an image G and an image H are collected for shear distortion detection;
(9) the electric zoom lens is switched to a small magnification, the three-dimensional moving sliding table and the three-dimensional moving mechanism are moved in the Z direction until the focus is clear by driving a program-controlled driving motor contained in the electric zoom lens, a program-controlled high-illumination shadowless light source is turned on, an image I is collected, an image D and the image I are analyzed, and the effective diameter of the anode is tested;
(10) the target plate electric switching wheel is switched to a target plate-free position on six hole sites of the target plate electric switching wheel, an electric shutter is opened, an electric baffle is removed, an electric zoom lens is switched to 1 x, a CCD camera is closed, an sCMOS camera is opened, a three-dimensional moving sliding table and a three-dimensional moving mechanism are moved by driving a program-controlled driving motor contained in the electric zoom lens, the electric zoom lens moves in the Z direction until a clear output image is formed by focusing, an image J is collected, and the uniformity of an image intensifier anode is detected; closing the electric shutter, moving back the electric baffle, collecting a background image K, and carrying out emission point, discharge and background non-uniformity tests;
(11) and (5) closing the sCMOS camera after the test is finished.
Further, when the dimension needs to be measured, the target plate electric switching wheel is switched to the position of the calibration target plate on six hole sites of the target plate electric switching wheel, the electric shutter is opened, the electric baffle is moved away, the electric zoom lens is switched to 1 x, and the CCD camera is opened; the three-dimensional moving sliding table and the three-dimensional moving mechanism are moved in the Z direction until the focusing is clear by driving a program control driving motor contained in the three-dimensional moving sliding table and the three-dimensional moving mechanism, and an image L is collected to perform calibration operation.
Compared with the prior art, the invention has the beneficial effects that:
1. the automatic testing requirement of the image quality comprehensive performance parameters of the image intensifier is solved;
2. the horizontal light path is changed into the vertical light path, so that the automatic installation and removal of the image intensifier by using a robot pneumatic finger are facilitated, and the testing efficiency of the image intensifier is improved;
3. a plurality of performance parameter tests are integrated on one test system, so that the operation is convenient, the cost is saved, and the reliability is high.
Drawings
FIG. 1: the invention relates to a structural schematic diagram of a comprehensive testing system for image quality of a low-light-level image intensifier.
FIG. 2: the invention relates to a wiring diagram of a dim light image intensifier image quality comprehensive test system.
FIG. 3: the invention relates to an optical path diagram of a low-light-level image intensifier image quality comprehensive test system.
FIG. 4: the image quality comprehensive test composite target plate of the image intensifier is disclosed.
FIG. 5: the image quality of the image intensifier of the invention comprehensively tests the shearing distortion target plate (30 mu m or 50 mu m black-white line width).
FIG. 6: the comprehensive image quality testing system for the low-light-level image intensifier calibrates a target plate (1mm black and white square).
In the figure: 1-an electric cabinet, 2-an industrial personal computer with a high-performance data acquisition card, 3-a program-controlled camera box, 4-a program-controlled high-illumination shadowless light source, 5-an electric zoom lens, 6-a CCD camera, 7-an sCMOS camera, 8-a half-transmitting half-reflecting mirror mounting seat, 9-a three-dimensional moving sliding table, 10-an automatic code scanning gun, 11-a test shell with an image intensifier, 12-an electric baffle, 13-1:1 projection lens, 14-an electric target plate switching wheel component, 141-a target plate electric switching wheel, 142-a target plate, 15-a three-dimensional moving mechanism, 16-an integrating sphere with an illumination detector, 17-an electric diaphragm, 18-an electric optical filter wheel component, 181-an optical filter electric switching wheel, 182-a neutral attenuation optical filter and 19-an electric shutter, 20-connecting cylinder, 21-halogen tungsten lamp mounting seat, 22-optical path mounting bracket, 23-light source module, 24-light source system dark box, 25-power supply and controller, 26-data acquisition module, 27-stepping motor controller, 28-servo motor controller, 29-illumination indicator, 30-CCD image chip, 31-half-transparent half-reflecting mirror, 32-sCMOS image chip, 33-cathode diaphragm, 34-centering diaphragm and 35-halogen tungsten lamp.
Detailed Description
As shown in fig. 1 and fig. 2, the comprehensive image quality testing system for the low-light-level image intensifier of the present invention can adopt the technical solution described in the above disclosure when being implemented, and details are not repeated here.
As shown in FIG. 1, all the non-optical glass materials in all the optical paths of the system are processed by non-reflective black materials or black matte, so that the influence of ambient light on the test result is reduced as much as possible. The color temperature calibration of the halogen tungsten lamp 35 is carried out before the calibration, and the color temperature calibration needs to be carried out on a corresponding color temperature testing instrument, so as to obtain the current value A of the halogen tungsten lamp with the color temperature of 2856K. Preheating the halogen tungsten lamp 35 for more than 30 minutes under the current value A of the color temperature 2856K before the test, opening the electric shutter 19, removing the electric baffle 12, switching the neutral attenuation filter 182 to be without the filter, detecting the illumination by using the illumination indicator 29, adjusting the electric diaphragm 17 or the manual adjustable diaphragm to enable the illumination to be at 5 multiplied by 10 -2 lx～5×10 -3 E between lx, record the position of the electric diaphragm 17 or fix the manual adjustable diaphragm; and regulating the current of the halogen tungsten lamp 35 within the range of A +/-30 mA to obtain a light source illuminance value E under 2856K. And adjusting the lamp current of the program-controlled high-illumination shadowless light source 4, and calibrating the illuminance of the program-controlled high-illumination shadowless light source 4 to be about 2000 lx. After the test shell 11 with the image intensifier is placed at a detection station through a robot finger or a human, the image intensifier is connected with a power supply, and the program control camera bellows is operated to a closed state under the control of a program.
As shown in FIG. 4, the image intensifier image quality integrated test composite target plate has four types of scribed lines. The first type is a vertical and horizontal scale reticle with a 1mm square at the center; the second type is a USAF1951 resolution test pattern, the patterns are arranged into a group at the center, and 4 groups are uniformly distributed on the circumference of r-7; the third type is a circle scribed line of a central area I, a middle area II and an edge area III, which is used for partitioning an output image of the image intensifier; the fourth type is a ray which starts from a circle line in the central I area and forms an included angle of 45 degrees with a scale line, and the ray is used for detecting snake-shaped distortion on an output image of the image intensifier.
As shown in FIG. 5, the shear distortion target plate for the image quality comprehensive test of the image intensifier of the invention has a width line of black and white of 30 μm or 50 μm, all the width lines are arranged in parallel, and can be installed at different angles according to the direction of the width lines.
As shown in FIG. 6, the system for testing the image quality of the low-light-level image intensifier calibrates the target plate to be a square with the side length of 1mm, and the positive direction is alternately arranged from black to white, thereby being beneficial to extracting the edge of the image during calibration.
The embodiment of the testing method using the micro-optical image intensifier image quality comprehensive testing system of the invention is now exemplified.
Example 1
The comprehensive test method for the image quality of the low-light-level image intensifier comprises the following steps:
1. image intensifier internal defect and multifilament detection
The target plate electric switching wheel 141 is switched to a target plate-free position on six hole positions of the target plate electric switching wheel, the electric shutter 19 is opened, the electric baffle 12 is moved away, the electric zoom lens 5 is switched to 1 x, and the CCD camera 6 is opened.
And (4) normally outputting image acquisition: monitoring an output image of the CCD camera 6, checking whether an image intensifier outputs an image or not, moving the Z-direction program control servo motor of the three-dimensional moving sliding table 9 and the three-dimensional moving mechanism 15 to focus a clear image, checking whether the output image of the image intensifier flickers or not, monitoring whether the current of the image intensifier changes or not, and collecting an output image A without flickers.
Strong light scintillation detection: and opening the program-controlled high-illumination shadowless light source 4, checking whether the output image of the image intensifier flickers or not, monitoring whether the current of the image intensifier changes or not, and collecting a flicker-free image B.
And (3) acquiring the anode surface image: and when the program-controlled high-illumination shadowless light source 4 is turned on, the power supply of the image intensifier is turned off, and an image C is acquired.
Processing the three images to obtain an image D, wherein the image D is processed on the basis of the image A by taking the image A as a base image, the image D is processed on the basis of the image A, the image D is an image A and image B and image C (here, the image B and the image C represent AND or difference set processing of image pixels), and then the image intensifier internal defects and multifilaments are detected.
Internal defects (excluding scratches, pocks, breaks, edges, etc. of the cathode and anode outer surfaces) include: moving points, stains, bright points, feedback points, breakdown points, air leakage points, structure points and scratches.
Judging defects: the pattern of the irregular boundary is converted by circular points with equal area; when the distance between two points is smaller than the size of a maximum of one point, the two points are regarded as one point, the size of which is equal to the sum of the sizes of the two points and the distance between them; defects are defects that differ in brightness from the surrounding area by more than 30%, including light defects and dark/black defects.
The multifilament detection includes a multifilament boundary and a multifilament pattern, the detection threshold of the multifilament noise is a difference in luminance between multifilaments of 10% or more, and an average value is calculated from three multifilaments in calculation.
2. Image intensifier cathode effective diameter, resolution and snake distortion detection
And (3) turning off the program-controlled high-illumination shadowless light source 4, turning on the power supply of the image intensifier, switching the target plate electric switching wheel 141 to the position of the composite target plate on six hole sites of the target plate electric switching wheel 141, collecting an image E, and detecting the effective cathode diameter, resolution and snake-shaped distortion of the image intensifier.
The position and size of the internal defect and multifilament detection are marked, when in marking, the center of a composite target plate reticle arranged on a projected target plate electric switching wheel 141 is taken as a coordinate origin, the coordinate of any point on an image surface can be determined, a region I, a region II and a region III are divided into a region I, a region II and a region III according to the radius in the circumferential direction, the diameter phi of the defect and the distance r from the center are marked, the pattern of the irregular boundary is marked as the outer diameter phi + the distance r from the center or the length a multiplied by the width b + the distance r from the center or the area (mm and mm) according to the outline 2 ) + distance from center rAnd the determination is made according to the acceptance rules (the number of allowable defects in each area) of the various tube types.
Effective cathode diameter measurement: the minimum size of the output image of the graduated scale on the composite target plate on the image intensifier, which is arranged on the target plate electric switching wheel 141 for reading projection, is the cathode effective diameter, and the diameter in the two reading directions is the smaller value.
And (3) detecting the resolution: after the projected USAF1951 patterns (the patterns are one group at the center, and 4 groups are uniformly distributed on the circumference of r ═ 7) on the composite target plate mounted on the target plate electric switching wheel 141 are imaged on the output surface of the image intensifier, the maximum group number of the optimal output target plate images on the center and r ═ 7 is identified as the resolution of the image intensifier.
S-shaped distortion detection: after the projected cross target plate on the composite target plate mounted on the target plate electric switching wheel 141 is imaged on the output surface of the image intensifier, the maximum bending offset of the cross line on the output image is detected as the snake-shaped distortion of the image intensifier.
3. Image intensifier shear distortion detection
The target plate is provided with shear distortion target plates in three directions of 0 degree, 60 degrees and 120 degrees on the electric switching wheel 141. After the target plate electric cutting wheel 141 respectively switches the 0 degree, 60 degree and 120 degree positions of three cutting distortion target plates arranged on six hole positions of the target plate electric cutting wheel 141, respectively collecting an image F, an image G and an image H, and carrying out cutting distortion detection. The measurement of the shear distortion is the maximum distance value of the straight line on the shear distortion target plate deviating from the normal straight line.
4. Image intensifier anode effective diameter detection
And the electric zoom lens 5 is switched to a small magnification, a Z-direction installed program control servo motor of the three-dimensional moving sliding table 9 and the three-dimensional moving mechanism 15 is moved until a focus is clear, a program control high-illumination shadowless light source is turned on, an image I is acquired, an image D and an image I are analyzed, and an anode effective diameter test is carried out. The anode effective diameter is measured as the diameter of the largest concentric circle on the anode output image that is coaxial with the image intensifier housing.
5. Image intensifier anode uniformity and background detection
Optical filterThe movable switching wheel 181 is switched to the ND3 filter, and there are 5 × 10- 5 lx +/-25% of uniform light irradiates the cathode surface of the image intensifier, an electric shutter 19 is opened, an electric baffle 12 is moved away, an electric zoom lens 5 is switched to 1 x, a CCD camera 6 is closed, an sCMOS camera 7 is opened, a program-controlled servo motor arranged in the Z direction of a three-dimensional moving sliding table 9 and a three-dimensional moving mechanism 15 is moved until focusing presents a clear image, an image J is collected, and anode uniformity detection of the image intensifier is carried out; and closing the electric shutter 19, moving the electric baffle 12 back, collecting a background image K, and carrying out emission point, discharge and background non-uniformity detection.
The anode uniformity test of the image intensifier is the ratio of the maximum value and the minimum value of the output brightness in the specified effective diameter of the whole fluorescent screen, and the diameter calculated by brightness measurement is phi 0.1 mm-phi 3.2mm and is adjustable.
Emission point, discharge and background non-uniformity test: checking the discharge and emission points higher than or equal to background flicker noise on the anode output fluorescent screen with thermal electron fluctuation, wherein the discharge and emission points are points and blocks which continuously emit light; the area on the output phosphor screen of the anode with a local brightness 30% higher than the average brightness was examined.
The test is ended and the sCMOS camera 7 is turned off.
6. Calibration
The calibration process comprises the following steps: when the dimension needs to be measured, the target plate electric switching wheel 141 is switched to the position of the calibration target plate arranged on six hole positions of the target plate electric switching wheel 141, the electric shutter 19 is opened, the electric baffle 141 is moved away, the electric zoom lens 5 is switched to 1 x, and the CCD camera 6 is opened; and moving the three-dimensional moving sliding table 9 and the Z-direction-mounted program-controlled servo motors of the three-dimensional moving mechanism 15 until the focusing is clear, acquiring an image L, and calibrating the measurement of the black and white square with the thickness of 1 mm.
Example 2
As in the system shown in fig. 1-3, the motorized zoom lens 5 may be replaced with a microscope; the XY axis of the three-dimensional moving sliding table 9 is manually adjusted and fixed, and the Z axis is adjusted by a program-controlled driving motor; the XY axis of the three-dimensional moving mechanism 15 is manually adjusted and fixed, and the Z axis is adjusted by a program-controlled driving motor; the motorized diaphragm 17 may be replaced by a manually adjustable diaphragm.
Claims (10)
1. A comprehensive image quality testing system of a low-light-level image intensifier is characterized by comprising a light source module, an electric target plate switching wheel assembly, a 1:1 projection lens, a program-controlled camera bellows, an electric zoom lens, a detection module, a three-dimensional moving sliding table, a three-dimensional moving mechanism, a light source system camera bellows, a program-controlled high-light shadowless light source, an automatic code scanning gun, a power supply and a controller;
the light source module consists of a halogen tungsten lamp mounting seat, a centering diaphragm, a connecting cylinder, an electric shutter, an electric optical filter wheel assembly, an electric diaphragm, an integrating sphere with an illumination detector and an illumination indicator;
the detection module consists of a CCD camera, an sCMOS camera and a semi-transparent semi-reflecting mirror mounting seat;
the centers of the light source module, the electric target plate switching wheel assembly, the 1:1 projection lens, the program-controlled camera bellows with the image intensifier, the program-controlled high-illumination shadowless light source, the electric zoom lens, the semi-transparent semi-reflecting mirror mounting seat and the sCMOS camera are positioned on the same axis, the alignment and the focusing are adjusted through the three-dimensional moving sliding table and the three-dimensional moving mechanism, and the CCD camera is coupled to an axis light path through the semi-transparent semi-reflecting mirror which is obliquely arranged at an angle of 45 degrees and simultaneously images;
the light source module is fixed on the light path mounting bracket, the halogen tungsten lamp is a standard A light source, the center of the filament is calibrated through the centering diaphragm, the connecting cylinder and the electric diaphragm are combined to adjust the illumination, and the electric shutter cuts off the light path; the electric optical filter wheel component consists of an optical filter electric switching wheel and an attenuation optical filter; the integrating sphere with the illumination detector uniformly outputs illumination, and the illumination indicator can display the output illumination value;
the electric target plate switching wheel assembly comprises a target plate electric switching wheel and a target plate; the target plate specifically includes: the composite target plate, the shear distortion target plate is 0 degree, 60 degrees and 120 degrees, and the calibration target plate;
the 1:1 projection lens is used for coupling the light passing through the target plate to the whole cathode surface of the image intensifier;
the program control camera bellows is used for providing a relatively independent illumination environment for the image intensifier to be measured, and the controller of the stepping motor arranged on the program control camera bellows is used for controlling the camera bellows to lift;
the electric zoom lens is used for coupling the optical signal output by the image intensifier to an imaging photoelectric surface of the detection module and switching different image acquisition regions;
the detection module switches the CCD camera and the sCMOS camera according to different testing links, and the semi-transparent semi-reflecting mirror which is installed in an inclined mode at an angle of 45 degrees couples the two cameras together;
the three-dimensional moving sliding table and the XY axis of the three-dimensional moving mechanism are fixed after being manually adjusted, and the Z axis meets the focusing requirement through program control movement of servo motor controllers arranged on the three-dimensional moving sliding table and the three-dimensional moving mechanism;
the light source system camera bellows provides a camera bellows environment for the light source module and the 1:1 projection lens.
2. The system for integrated testing of image quality of a low-light level image intensifier as claimed in claim 1, wherein:
the attenuation filter has five groups of attenuation multiplying power of ND3, ND2, ND1.5, ND1 and ND0.5, and the filter is switched to obtain the required illumination.
3. The system for integrated testing of image quality of a micro optical image intensifier as claimed in claim 2, wherein:
an electrical cabinet for mounting a power supply and a controller is also included.
4. The system for integrated testing of image quality of a micro optical image intensifier as claimed in claim 3, wherein:
the program-controlled high-illumination shadowless light source provides illumination in the detection process of the image intensifier.
5. The system for comprehensive testing of image quality of a low-light level image intensifier as claimed in claim 4, wherein:
the dustproof electric baffle plate for the 1:1 projection lens is further included.
6. The system for comprehensive testing of image quality of a low-light level image intensifier as claimed in claim 5, wherein:
the industrial personal computer is provided with a data acquisition module for acquiring data and transmitting control signals.
7. A comprehensive testing method for the image quality of a low-light-level image intensifier, which adopts the comprehensive testing system for the image quality of the low-light-level image intensifier as claimed in claim 6, and comprises the following steps:
(1) before the comprehensive test of image quality, preheating a halogen tungsten lamp, opening an electric shutter, removing an electric baffle, switching a neutral attenuation filter to be without the filter, detecting the illumination by using an illumination indicator, and adjusting the current value of a power supply of the halogen tungsten lamp to enable the illumination to be a preset calibration value;
(2) adjusting the lamp current of the program-controlled high-illumination shadowless light source, and calibrating the illuminance of the program-controlled high-illumination shadowless light source to 2000 lx; after the test shell with the image intensifier is placed at a detection station, the image intensifier is connected with a power supply, and the program control camera bellows is operated to a closed state under program control;
(3) the target plate electric switching wheel is switched to a target plate-free position on six hole sites of the target plate electric switching wheel, an electric shutter is opened, an electric baffle is removed, the electric zoom lens is switched to 1 x, and the CCD camera is opened;
(4) and (4) normally outputting image acquisition: monitoring an output image of a CCD camera, checking whether an image intensifier outputs an image or not, moving a three-dimensional moving sliding table and a three-dimensional moving mechanism by driving a program-controlled driving motor contained in the image intensifier, moving in a Z direction until the image is focused to form a clear image, checking whether the image intensifier outputs an image or not and monitoring whether the current of the image intensifier changes or not, and acquiring an image A without flicker;
(5) strong light scintillation detection: opening the program-controlled high-illumination shadowless light source, checking whether the output image of the image intensifier flickers or not, monitoring whether the current of the image intensifier changes or not, and collecting an image B;
(6) and (3) acquiring the anode surface image: at the moment, the power supply of the image intensifier is turned off, and an image C is collected;
(7) processing the images A to C, detecting defects and multifilaments in the image intensifier, and processing to obtain an image D;
(8) turning off the program-controlled high-illumination shadowless light source, turning on a power supply of the image intensifier, switching the target plate electric switching wheel to a composite target plate position on six hole sites of the target plate electric switching wheel, collecting an image E, and detecting the effective cathode diameter, resolution and snake-shaped distortion of the image intensifier;
(9) the target plate electric switching wheel is respectively switched to the positions of 0 degrees, 60 degrees and 120 degrees of the shear distortion target plate arranged on six hole sites of the target plate electric switching wheel, and an image F, an image G and an image H are collected for shear distortion detection;
(10) the electric zoom lens is switched to a small magnification, the three-dimensional moving sliding table and the three-dimensional moving mechanism are moved in the Z direction until the focus is clear by driving a program-controlled driving motor contained in the electric zoom lens, a program-controlled high-illumination shadowless light source is turned on, an image I is collected, an image D and the image I are analyzed, and the effective diameter of the anode is tested;
(11) switching a target plate electric switching wheel to a target plate-free position on six hole sites of the target plate electric switching wheel, opening an electric shutter, removing an electric baffle, switching an electric zoom lens to 1 x, closing a CCD camera, opening an sCMOS camera, moving a three-dimensional moving sliding table and a three-dimensional moving mechanism, focusing clear images by using motors arranged on the three-dimensional moving sliding table and the three-dimensional moving mechanism in a Z-direction program control driving manner, collecting an image J, and performing image intensifier anode uniformity detection; closing the electric shutter, moving back the electric baffle, collecting a background image K, and carrying out emission point, discharge and background non-uniformity tests; monitoring a background image to detect whether the image flickers;
(12) and (5) closing the sCMOS camera after the test is finished.
8. The method for comprehensively testing the image quality of the micro-optical image intensifier as claimed in claim 7, wherein:
the processing results in an image D, which is based on the image a, and is equal to the image a, the image B, and the image C.
9. The comprehensive testing method for the image quality of the micro-light image intensifier as claimed in claim 7 or 8, further comprising the steps of calibrating the measurement size, specifically comprising:
the target plate electric switching wheel is switched to the position of a calibration target plate arranged on six hole sites of the target plate electric switching wheel, an electric shutter is opened, an electric baffle is removed, the electric zoom lens is switched to 1 x, and the CCD camera is opened; the three-dimensional moving sliding table and the three-dimensional moving mechanism are moved by driving a program-controlled driving motor contained in the three-dimensional moving sliding table and the three-dimensional moving mechanism, the three-dimensional moving sliding table moves in the Z direction until the three-dimensional moving sliding table is focused to form a clear image, and an image L is collected to perform calibration operation.
10. The method for comprehensively testing the image quality of the micro-optical image intensifier as claimed in claim 9, wherein:
the test housing with the image intensifier is placed at the inspection station by robotic fingers or manually.
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