CN114993629B - Method for detecting external field optical performance of visible light low-light night vision instrument - Google Patents
Method for detecting external field optical performance of visible light low-light night vision instrument Download PDFInfo
- Publication number
- CN114993629B CN114993629B CN202210732314.5A CN202210732314A CN114993629B CN 114993629 B CN114993629 B CN 114993629B CN 202210732314 A CN202210732314 A CN 202210732314A CN 114993629 B CN114993629 B CN 114993629B
- Authority
- CN
- China
- Prior art keywords
- target plate
- light
- instrument
- micro
- visible light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000004297 night vision Effects 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 93
- 230000008569 process Effects 0.000 claims description 16
- 239000005304 optical glass Substances 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- 230000000007 visual effect Effects 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 102000016726 Coat Protein Complex I Human genes 0.000 description 1
- 108010092897 Coat Protein Complex I Proteins 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- AGGKEGLBGGJEBZ-UHFFFAOYSA-N tetramethylenedisulfotetramine Chemical compound C1N(S2(=O)=O)CN3S(=O)(=O)N1CN2C3 AGGKEGLBGGJEBZ-UHFFFAOYSA-N 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Telescopes (AREA)
Abstract
The invention discloses a method for detecting the external field optical performance of a visible light low-light night vision instrument, which specifically comprises the following steps: firstly, an optical performance detection system is constructed, and then optical performance detection is carried out; the detection system comprises a photoelectric instrument to be detected and a target plate adjusting module, wherein the target plate adjusting module is fixed right in front of the photoelectric instrument to be detected; the visible light target plate is detachably arranged at the top of the target plate adjusting module; the micro-light target plate is detachably arranged at the top of the target plate adjusting module; the laser ranging module is movably arranged at the position of the photoelectric instrument to be measured; the light reducing cover is fixed on the objective lens of the photoelectric instrument to be tested; the method for detecting the external field optical performance of the visible light low-light night vision instrument, disclosed by the invention, abandons the traditional collimator tube detection method, combines a target plate on a limited long distance to finish the detection of the photoelectric instrument to be detected, and has important significance in improving the detection efficiency of the photoelectric instrument and reducing the cost of a detection device.
Description
Technical Field
The invention relates to an optical performance detection method, in particular to a method for detecting the external optical performance of a visible light low-light night vision instrument, and belongs to the technical field of optical performance detection methods.
Background
The photoelectric instrument is an instrument, equipment or system which comprehensively utilizes optical technology, photoelectric technology, optoelectronic technology, electronic technology, computer technology and precision mechanical technology as a whole to realize a certain specific function, takes charge of the tasks of reconnaissance, tracking, detection, night vision, fire control, early warning, navigation, guidance, photoelectric countermeasure, optical communication, photoelectric information processing and the like, has the advantages of high precision, high resolution, large information capacity, strong electromagnetic energy resistance, good confidentiality and the like, has important value and great development prospect in military, and is an important means for implementing accurate striking and integrated information combat; the photoelectric instrument is operated and used in a long-time field environment, is affected by factors such as vibration impact, environmental shock and the like, and inevitably causes problems such as mechanism clamping stagnation, resolution capability degradation, part faults, shafting imbalance and other main performance indexes to be reduced, so that the normal exertion of the performance of the photoelectric instrument is affected, and therefore, the development of a detection device of the photoelectric instrument is very important for guaranteeing the main performance indexes and performance exertion of the photoelectric instrument; the existing photoelectric instrument detection devices are generally divided into a base level optical performance detection device and a base level photoelectric detection device; the base-level Optical performance detection device is generally arranged in a rear production workshop, a repair worker or an Optical laboratory, can meet the detection of Optical performance indexes of various types of photoelectric instruments, such as a universal photoelectric instrument Test and maintenance System (COPI) developed by HGH infrared systems, a modularized photoelectric Test System (METS) developed by CI longitudinal frame systems, and the like; if the METS comprises a highly integrated optical collimation module, data processing software and a power supply control system, the optical collimation module organically integrates an off-axis parabolic main mirror, a plane source blackbody, an integrating sphere and the like through an electric target wheel, and the detection indexes comprise MRTD and NETD of a thermal infrared imager, resolution of a visible light/low-light night vision instrument, MTF, laser emission energy of a laser ranging instrument, beam quality and the like; the base-level optical performance detection device has small volume and light weight, generally bears an on-line detection task, realizes the accompanying guarantee of the photoelectric instrument under the external field condition, develops various types of base-level photoelectric detection devices by the external army, such as SBIR and Lockheed longitudinal frame Martin corporation, provides a Third generation test device (Third longitudinal frame echelon longitudinal frame test longitudinal frame set, TETS) Portable multispectral detection equipment (Portable longitudinal frame multi-spectral longitudinal frame test longitudinal frame system) for the United states navy, PMTS) of the formula (i); PMTS adopts a modularized design, comprises an optical collimation module, a power supply module and a target light source, is quickly assembled during use, is quickly disassembled after detection is finished, is convenient to transport, and covers photoelectric equipment of various wave bands of the American navy; in addition, SBIR has developed the general photoelectric Test equipment (Common longitudinal frame E-O longitudinal frame Test longitudinal frame Set, CEOTS), CEOTS adopts off-axis paraboloid as the main reflector, the general runner switches over the blackbody or visible light source, has realized the detection of main performance indexes such as MRTD and AN/PVS series glimmer sight resolution of the army AN/PAS series thermal imaging sight; the base level optical performance detection device has high detection precision, more detectable optical performance indexes, larger equipment volume, inapplicability to carrying operation and certain requirements on the use environment, and if rapid deployment or concomitant guarantee is to be realized under the external field environment condition, the detection device is required to have small volume, light weight and good environmental adaptability; the base level optical performance detection device has small volume, light weight and good environmental adaptability, can meet the detection of main optical performance indexes of the photoelectric instrument under the external field condition, but adopts a collimator to simulate an infinite target to realize the detection of main performance indexes no matter the base level optical performance detection device or the base level optical performance detection device, and applies the collimator to the optical performance detection under the external field condition, so that the price of the detection device is higher on one hand, and the environmental adaptability problem of the detection device is also required to be considered on the other hand, such as athermalization design of the collimator, filling of dry and clean nitrogen into the collimator to improve the mildew and fog prevention performance of the collimator, and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a method for detecting the external optical performance of a visible light low-light night vision instrument, which abandons the traditional collimator tube detection method, combines a target plate on a limited long distance to finish the detection of a tested photoelectric instrument, and has important significance in improving the detection efficiency of the photoelectric instrument and reducing the cost of a detection device.
The invention discloses a method for detecting the external field optical performance of a visible light low-light night vision instrument, which specifically comprises the following steps: firstly, an optical performance detection system is constructed, and then optical performance detection is carried out; the detection system comprises
The photoelectric instrument to be tested is used for testing,
The target plate adjusting module is fixed right in front of the photoelectric instrument to be tested;
The visible light target plate is detachably arranged at the top of the target plate adjusting module;
the micro-light target plate is detachably arranged at the top of the target plate adjusting module;
The laser ranging module is movably arranged at the position of the photoelectric instrument to be measured;
the light reducing cover is fixed on the objective lens of the photoelectric instrument to be tested;
The optical performance detection comprises visible light instrument detection and micro light instrument detection, wherein in the detection process, a corresponding target plate is selected according to a detected photoelectric instrument, namely a visible light target plate for the visible light instrument detection; the low-light target plate for low-light night vision instrument detection is as follows:
When the photoelectric instrument to be detected is a visible light instrument, the detection process is as follows:
(1) Under the condition of sufficient external field illumination, the photoelectric instrument to be tested is in a working state;
(2) Checking a resolution index value of the tested photoelectric instrument, and determining the relative distance between the tested photoelectric instrument and the visible light target plate according to the resolution index value;
(3) Measuring the relative distance between the photoelectric instrument to be measured and the visible light target plate by using the laser ranging module until reaching the distance value required by detection, and completing the positioning of the installation position of the target plate adjusting module;
(4) Installing a target plate adjusting module at the positioning position of the previous step, then installing a visible light target plate on the target plate adjusting module, and aligning the visible light target plate to the tested photoelectric instrument, wherein the target plate is parallel to the visual axis of the tested photoelectric instrument;
(5) When the operator observes the visible light target plate through the ocular of the photoelectric instrument to be measured, the operator looks up the corresponding resolution angle value according to the visible light resolution lookup table, namely observes the visible light target plate and looks up the visible light minimum unit pattern, so as to determine the resolution value of the visible light instrument to be measured.
When the photoelectric instrument to be detected is a micro-light instrument, the detection process is as follows:
(1) A light reducing cover is arranged on an objective lens of a micro-light instrument to be measured;
(2) The polarizer in the light reducing cover is adjusted to have an angle of 90 degrees with the polarization analyzer, and the illuminance in the light reducing cover is minimum at the moment;
(3) Ensuring that the micro-optical instrument to be tested is in a working state;
(4) Checking a resolution index value of the tested photoelectric instrument, and determining the relative distance between the tested photoelectric instrument and the target plate according to the index value;
(5) Measuring the relative distance between the photoelectric instrument to be measured and the micro-light target plate by using a laser ranging module until reaching the distance value required by detection; positioning of the target plate adjusting module mounting position is completed;
(6) Installing a target plate adjusting module at the positioning position of the previous step, then installing a micro-optical target plate on the target plate adjusting module, aligning the micro-optical target plate to a tested photoelectric instrument, and enabling the target plate to be parallel to the visual axis of the tested photoelectric instrument;
(7) An operator observes the division pattern on the micro-light target plate through an eyepiece of the micro-light night vision instrument to be measured, the relative angle between a polarizing plate in the light-reducing cover and the polarization-detecting plate is slowly adjusted, the illuminance value in the light-reducing cover is slowly increased at the moment, and when a human eye can normally observe the division pattern on the micro-light target plate, the rotation of the polarizing plate is stopped;
(8) When the visible reticle pattern is observed, the corresponding resolution angle value is found by comparing with the micro-optical resolution look-up table, namely, the reticle pattern on the micro-optical target plate is observed, and the visible minimum unit pattern is found, so that the resolution value of the micro-optical night vision instrument to be measured is determined.
Further, the dimming cover comprises a cover body, wherein an objective lens connecting assembly, a light measuring and displaying assembly and a gradual dimming assembly are sequentially arranged on the cover body; the objective lens connecting component is arranged with the objective lens of the photoelectric instrument to be tested; the light measuring and displaying component is a detecting module for detecting and displaying the ambient illuminance in the light reducing cover in real time; the gradual change light reduction component consists of two polarized optical lenses of polarizing optical glass and polarizing optical glass.
Further, the target plate adjusting module is a tripod; the tripod is provided with level bubbles, and the visible light target plate or the low-light target plate is connected with the tripod through a connecting rod; the laser ranging module is a laser ranging machine; the target plate adjusting module is used for adjusting the following steps: the connecting rod is reliably arranged on the tripod, and the tripod and the ground are vertical in the use process by adjusting the telescopic rod of the tripod and observing and centering the level bubble.
Further, the visible light target plate is composed of a thin aluminum plate, the surface of the visible light target plate is coated with a white diffuse reflection coating, and the dividing patterns are four stripes with different line widths and accord with JB/T9328-1999 resolution target plate standards; the micro-light target plate is composed of a homogeneous thin aluminum plate, the front surface and the back surface of the micro-light target plate are respectively provided with 85% and 35% of white diffuse reflection coatings, and the dividing patterns are four stripes with different line widths and accord with the USAF-1951 resolution target plate standard.
Compared with the prior art, the method for detecting the external optical performance of the visible light low-light night vision instrument, disclosed by the invention, has the advantages that the traditional collimator detection method is abandoned, the detection is carried out by combining a target plate on a limited long distance, the size is small, the weight is light, the installation and the withdrawal are convenient, the operation is simple and convenient, the carrying is convenient, the power supply is not needed, the detection of the low-light night vision instrument is particularly realized, the detection can be carried out under the condition of strong light in daytime through the design of the dimming cover, the detection time is greatly expanded, the detection efficiency is greatly improved, and the method has important significance in improving the detection efficiency of the photoelectric instrument and reducing the cost of a detection device.
Drawings
Fig. 1 is a schematic overall structure of embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a visible light target plate pattern according to the present invention.
FIG. 3 is a schematic diagram of a micro-optic target plate pattern according to the present invention.
Detailed Description
Example 1
The method for detecting the external optical performance of the visible light low-light night vision instrument shown in fig. 1 to 3 specifically comprises the following steps: firstly, an optical performance detection system is constructed, and then optical performance detection is carried out; the detection system comprises
The photoelectric instrument 1 to be tested is provided with a measuring device,
The target plate adjusting module 2 is fixed right in front of the photoelectric instrument to be tested;
The visible light target plate 3 is detachably arranged at the top of the target plate adjusting module;
The micro-light target plate 4 is detachably arranged at the top of the target plate adjusting module;
the laser ranging module 5 is movably arranged at the photoelectric instrument to be measured;
A light reducing cover 6, wherein the light reducing cover 6 is fixed on an objective lens 7 of the photoelectric instrument 1 to be tested;
The optical performance detection comprises visible light instrument detection and micro light instrument detection, wherein in the detection process, a corresponding target plate is selected according to a detected photoelectric instrument, namely a visible light target plate for the visible light instrument detection; the low-light target plate for low-light night vision instrument detection is as follows:
When the photoelectric instrument to be detected is a visible light instrument, the detection process is as follows:
(1) Under the condition of sufficient external field illumination, the photoelectric instrument to be tested is in a working state;
(2) Checking a resolution index value of the tested photoelectric instrument, and determining the relative distance between the tested photoelectric instrument and the visible light target plate according to the resolution index value;
(3) Measuring the relative distance between the photoelectric instrument to be measured and the visible light target plate by using the laser ranging module until reaching the distance value required by detection, and completing the positioning of the installation position of the target plate adjusting module;
(4) Installing a target plate adjusting module at the positioning position of the previous step, then installing a visible light target plate on the target plate adjusting module, and aligning the visible light target plate to the tested photoelectric instrument, wherein the target plate is parallel to the visual axis of the tested photoelectric instrument;
(5) When the operator observes the visible light target plate through the ocular of the photoelectric instrument to be measured, the operator looks up the corresponding resolution angle value according to the visible light resolution lookup table, namely observes the visible light target plate and looks up the visible light minimum unit pattern, so as to determine the resolution value of the visible light instrument to be measured.
When the photoelectric instrument to be detected is a micro-light instrument, the detection process is as follows:
(1) A light reducing cover is arranged on an objective lens of a micro-light instrument to be measured;
(2) The polarizer in the light reducing cover is adjusted to have an angle of 90 degrees with the polarization analyzer, and the illuminance in the light reducing cover is minimum at the moment;
(3) Ensuring that the micro-optical instrument to be tested is in a working state;
(4) Checking a resolution index value of the tested photoelectric instrument, and determining the relative distance between the tested photoelectric instrument and the target plate according to the index value;
(5) Measuring the relative distance between the photoelectric instrument to be measured and the micro-light target plate by using a laser ranging module until reaching the distance value required by detection; positioning of the target plate adjusting module mounting position is completed;
(6) Installing a target plate adjusting module at the positioning position of the previous step, then installing a micro-optical target plate on the target plate adjusting module, aligning the micro-optical target plate to a tested photoelectric instrument, and enabling the target plate to be parallel to the visual axis of the tested photoelectric instrument;
(7) An operator observes the division pattern on the micro-light target plate through an eyepiece of the micro-light night vision instrument to be measured, the relative angle between a polarizing plate in the light-reducing cover and the polarization-detecting plate is slowly adjusted, the illuminance value in the light-reducing cover is slowly increased at the moment, and when a human eye can normally observe the division pattern on the micro-light target plate, the rotation of the polarizing plate is stopped;
(8) When the visible reticle pattern is observed, the corresponding resolution angle value is found by comparing with the micro-optical resolution look-up table, namely, the reticle pattern on the micro-optical target plate is observed, and the visible minimum unit pattern is found, so that the resolution value of the micro-optical night vision instrument to be measured is determined.
The dimming cover 6 comprises a cover body, and an objective lens connecting assembly, a light measuring and displaying assembly and a gradual dimming assembly are sequentially arranged on the cover body; the objective lens connecting component is arranged with the objective lens of the photoelectric instrument to be tested; the light measuring and displaying component is a detecting module for detecting and displaying the ambient illuminance in the light reducing cover in real time; the gradual change light reduction component consists of two polarized optical lenses of polarizing optical glass and polarizing optical glass.
The target plate adjusting module 2 is a tripod; the tripod is provided with a level bubble 8, and the visible light target plate or the low-light target plate is connected with the tripod through a connecting rod; the laser ranging module is a laser ranging machine; the target plate adjusting module is used for adjusting the following steps: the connecting rod is reliably arranged on the tripod, and the tripod and the ground are vertical in the use process by adjusting the telescopic rod of the tripod and observing and centering the level bubble.
The visible light target plate is composed of a thin aluminum plate, the surface of the visible light target plate is coated with a white diffuse reflection coating, and the dividing patterns are four stripes with different line widths and accord with JB/T9328-1999 resolution target plate standards; the micro-light target plate is composed of a homogeneous thin aluminum plate, the front surface and the back surface of the micro-light target plate are respectively provided with 85% and 35% of white diffuse reflection coatings, and the dividing patterns 9 are four stripes with different line widths and accord with the USAF-1951 resolution target plate standard.
The visible light target plate, the low-light target plate and the dimming cover are arranged as follows:
1. determination of target plate size: the visual field of the visible light/low-light night vision instrument is generally about 8 degrees, the relative distance between the target plate and the instrument to be measured is not less than 30 meters due to the limitation of the nearest observation distance of the photoelectric instrument, if the size of the target plate is too large, the operation is not easy to be unfolded, the target plate is easy to shake due to wind force, and even the safety accident is caused by dumping, so that the target plate with the visual field not more than 1 degree is suitable, and the size of the target plate can be obtained by the following formula:
2×30×tan (1 °/2) =0.52 meters;
2. Determination of visible light target plate division patterns: the visible light target board refers to JB/T9328-1999 to manufacture a resolution board pattern; the resolution of the visible light optical instrument is higher; thus, when the resolution is detected; the method has the advantages that the patterns are required to be etched on the visible light target plate, and the patterns are smaller, the line width is narrower and the patterns are more fine; the method has the advantages that more division patterns are etched on a target plate with fixed size, higher requirements are provided for an etching process, and based on the processing process, the difficulty of processing such dense lines on a metal sheet is higher, so that the lines can be used as a low-resolution reference of the division patterns at a longer distance, namely, when a high-resolution visible light optical instrument is detected, the resolution detection of the high-resolution optical instrument can be realized by increasing the relative distance between the target plate and the detected instrument, and the method comprises the following steps: assuming that the width of the target line on the visible light target plate is P (m), the relative distance between the centers of the two line widths is 2P, and the observation distance is S (m), the resolution opening angle is obtained The method comprises the following steps:
the resolution angle values at different distances can be calculated according to the formula to obtain table 1,
Table 1 table for resolution selection of visible light target plate
The width of the division pattern in Table 1 is selected according to the relative distance between the target plate and the measured instrument of 30m, and the lines of the adjacent target plates are according toThe geometric progression calculation is carried out, the relative range distance between the target plate and the optical instrument to be measured is expanded from 30m to 100m, and the range of the resolution angle value which can be detected is expanded to/>。
3. Determination of micro-optical target plate division patterns: the micro-light target plate refers to the USAF-1951 resolution target standard to manufacture a resolution plate pattern; the resolution of the low-light night vision instrument is lower than that of a visible light instrument, so that the single division pattern area is larger, etching is more convenient, and the division line width of the target plate is 8-18 mm according to the calculation of the relative distance between the micro-light target plate and the instrument to be measured by 20 meters; the target plate positions (10-80 meters) are respectively moved according to the nearest observation distance of the low-light night vision instrument, so that the resolution detection of 0.2-3.6 mrad can be realized; similarly, assuming that the target line width on the micro-optical target plate is P (mm), the relative distance between the two line width centers is 2P, and the observation distance is S (m), the resolution opening angle a (mrad) is:
the resolution angle values at different distances can be calculated according to the formula to obtain table 2,
Table 2 micro-optical target plate resolution selecting table
The width of the division pattern in Table 2 is selected according to the relative distance between the target plate and the measured instrument of 10m, and the lines of the adjacent target plates are according toThe geometric progression calculation, namely expanding the relative range distance between the target plate and the optical instrument to be measured from 5m to 80m, and expanding the range of the resolution angle value which can be detected to 0.2-5.71 mrad; different from a visible light target plate, the surface of the low-light target plate is coated with a white diffuse reflection coating, the target plate is a transparent pattern 9, the front surface of the target plate adopts a black lining plate with 0.85 contrast, and the back surface of the target plate adopts a black lining plate with 0.35 contrast; in the process of detecting different low-light night vision instruments, the front detection of the target plate or the back detection of the target plate is selected according to detection requirements.
4. A light reducing cover: the light reducing cover is mainly internally provided with adjustable light reducing lenses which are two pieces of high-quality ultra-high-finish optical polarized glass, before a measured micro-light night vision instrument is opened, the polarization angle of the two pieces of polarized glass is firstly adjusted to 90 degrees, then an image is output through an eyepiece of the micro-light night vision instrument, the included angle between the polarized optical glass and the polarization detection optical glass is slowly rotated, and when the human eye can see the division pattern on a micro-light target plate clearly through the eyepiece of the micro-light night vision instrument and the brightness is moderate, the rotation of the polarized optical glass is stopped;
5. Detection environment: under the condition of natural light, the surrounding illuminance of the target plate is close to the target plate, and the detection process is not obviously influenced; is arranged in a clear atmosphere environment and avoids the influence of direct sunlight or surrounding reflectors.
The above embodiments are merely preferred embodiments of the present invention, and all changes and modifications that come within the meaning and range of equivalency of the structures, features and principles of the invention are therefore intended to be embraced therein.
Claims (3)
1. The method for detecting the external field optical performance of the visible light low-light night vision instrument is characterized by comprising the following steps of: firstly, an optical performance detection system is constructed, and then optical performance detection is carried out; the detection system comprises
The photoelectric instrument to be tested is used for testing,
The target plate adjusting module is fixed right in front of the photoelectric instrument to be tested;
The visible light target plate is detachably arranged at the top of the target plate adjusting module;
the micro-light target plate is detachably arranged at the top of the target plate adjusting module;
The laser ranging module is movably arranged at the position of the photoelectric instrument to be measured;
the light reducing cover is fixed on the objective lens of the photoelectric instrument to be tested;
The optical performance detection comprises visible light instrument detection and micro light instrument detection, wherein in the detection process, a corresponding target plate is selected according to a detected photoelectric instrument, namely a visible light target plate for the visible light instrument detection; the low-light target plate for low-light night vision instrument detection is as follows:
When the photoelectric instrument to be detected is a visible light instrument, the detection process is as follows:
(1) Under the condition of sufficient external field illumination, the photoelectric instrument to be tested is in a working state;
(2) Checking a resolution index value of the tested photoelectric instrument, and determining the relative distance between the tested photoelectric instrument and the visible light target plate according to the resolution index value;
(3) Measuring the relative distance between the photoelectric instrument to be measured and the visible light target plate by using the laser ranging module until reaching the distance value required by detection, and completing the positioning of the installation position of the target plate adjusting module;
(4) Installing a target plate adjusting module at the positioning position of the previous step, then installing a visible light target plate on the target plate adjusting module, and aligning the visible light target plate to the tested photoelectric instrument, wherein the target plate is parallel to the visual axis of the tested photoelectric instrument;
(5) An operator observes the division pattern on the visible light target plate through an eyepiece of the tested photoelectric instrument, when the visible division pattern is observed, the operator looks up the corresponding resolution angle value according to the visible light resolution lookup table, namely, observes the division pattern of the visible light target plate, and looks up the visible minimum unit pattern, so that the resolution value of the tested visible light instrument is determined;
wherein, the target line width on the visible light target plate is Pm, the relative distance between the centers of the two line widths is 2P, and the observation distance is Sm, the resolution opening angle The method comprises the following steps: /(I)；
When the photoelectric instrument to be detected is a micro-light instrument, the detection process is as follows:
(1) A light reducing cover is arranged on an objective lens of a micro-light instrument to be measured;
(2) The polarizer in the light reducing cover is adjusted to have an angle of 90 degrees with the polarization analyzer, and the illuminance in the light reducing cover is minimum at the moment;
(3) Ensuring that the micro-optical instrument to be tested is in a working state;
(4) Checking a resolution index value of the tested photoelectric instrument, and determining the relative distance between the tested photoelectric instrument and the target plate according to the index value;
(5) Measuring the relative distance between the photoelectric instrument to be measured and the micro-light target plate by using a laser ranging module until reaching the distance value required by detection; positioning of the target plate adjusting module mounting position is completed;
(6) Installing a target plate adjusting module at the positioning position of the previous step, then installing a micro-optical target plate on the target plate adjusting module, aligning the micro-optical target plate to a tested photoelectric instrument, and enabling the target plate to be parallel to the visual axis of the tested photoelectric instrument;
(7) An operator observes the division pattern on the micro-light target plate through an eyepiece of the micro-light night vision instrument to be measured, the relative angle between a polarizing plate in the light-reducing cover and the polarization-detecting plate is slowly adjusted, the illuminance value in the light-reducing cover is slowly increased at the moment, and when a human eye can normally observe the division pattern on the micro-light target plate, the rotation of the polarizing plate is stopped;
(8) When the visible reticle pattern is observed, the corresponding resolution angle value is found by comparing with a micro-optical resolution look-up table, namely, the reticle pattern on the micro-optical target plate is observed, and the visible minimum unit pattern is found, so that the resolution value of the micro-optical night vision instrument to be measured is determined;
The target line width on the micro-light target plate is set to be P mm, the relative distance between the centers of two line widths is set to be 2P, the observation distance is set to be Sm, and then the resolution opening angle amrad is set as follows: ；
The visible light target plate is composed of a thin aluminum plate, the surface of the visible light target plate is coated with a white diffuse reflection coating, and the dividing patterns are four stripes with different line widths and accord with JB/T9328-1999 resolution target plate standards; the micro-light target plate is composed of a homogeneous thin aluminum plate, the front surface and the back surface of the micro-light target plate are respectively provided with 85% and 35% of white diffuse reflection coatings, and the dividing patterns are four stripes with different line widths and accord with the USAF-1951 resolution target plate standard.
2. The method for detecting the external optical performance of the visible low-light night vision instrument according to claim 1, wherein the method comprises the following steps: the light reducing cover comprises a cover body, and an objective lens connecting component, a light measuring and displaying component and a gradual change light reducing component are sequentially arranged on the cover body; the objective lens connecting component is arranged with the objective lens of the photoelectric instrument to be tested; the light measuring and displaying component is a detecting module for detecting and displaying the ambient illuminance in the light reducing cover in real time; the gradual change light reduction component consists of two polarized optical lenses of polarizing optical glass and polarizing optical glass.
3. The method for detecting the external optical performance of the visible low-light night vision instrument according to claim 1, wherein the method comprises the following steps: the target plate adjusting module is a tripod; the tripod is provided with level bubbles, and the visible light target plate or the low-light target plate is connected with the tripod through a connecting rod; the laser ranging module is a laser ranging machine; the target plate adjusting module is used for adjusting the following steps: the connecting rod is reliably arranged on the tripod, and the tripod and the ground are vertical in the use process by adjusting the telescopic rod of the tripod and observing and centering the level bubble.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210732314.5A CN114993629B (en) | 2022-06-23 | 2022-06-23 | Method for detecting external field optical performance of visible light low-light night vision instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210732314.5A CN114993629B (en) | 2022-06-23 | 2022-06-23 | Method for detecting external field optical performance of visible light low-light night vision instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114993629A CN114993629A (en) | 2022-09-02 |
| CN114993629B true CN114993629B (en) | 2024-06-07 |
Family
ID=83037898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210732314.5A Active CN114993629B (en) | 2022-06-23 | 2022-06-23 | Method for detecting external field optical performance of visible light low-light night vision instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114993629B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7391504B1 (en) * | 2005-12-14 | 2008-06-24 | The United States Of America As Represented By The Secretary Of The Air Force | Low cost night vision apparatus and cockpit lighting compatibility evaluation via visual acuity |
| CN103398837A (en) * | 2013-07-17 | 2013-11-20 | 中国人民解放军济南军区72465部队 | Reflected light path-based low-light level night vision device resolution detection method and device |
| CN204924617U (en) * | 2015-09-14 | 2015-12-30 | 中国人民解放军武汉军械士官学校 | Integration low -light level night vision device performance detects leading optical system |
| CN211717753U (en) * | 2019-10-22 | 2020-10-20 | 长春军晟科技有限公司 | External field performance testing device for photoelectric instrument |
| CN112731665A (en) * | 2020-12-31 | 2021-04-30 | 中国人民解放军32181部队 | Self-adaptive binocular stereoscopic vision low-light night vision head-mounted system |
| CN113686551A (en) * | 2021-08-20 | 2021-11-23 | 北方夜视技术股份有限公司 | Portable image intensifier resolution measuring device and measuring method |
| CN217878282U (en) * | 2022-06-23 | 2022-11-22 | 中国人民解放军32181部队 | External field optical performance detection device of visible light shimmer night vision instrument |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004055472A2 (en) * | 2002-12-13 | 2004-07-01 | Smith Bruce W | Method for aberration detection and measurement |
| DE102007055062A1 (en) * | 2007-11-16 | 2009-05-28 | Carl Zeiss Smt Ag | Optical system, and method for characterizing an optical system |
| US9347742B2 (en) * | 2013-12-24 | 2016-05-24 | Deepak Varshneya | Electro-optic system for crosswind measurement |
-
2022
- 2022-06-23 CN CN202210732314.5A patent/CN114993629B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7391504B1 (en) * | 2005-12-14 | 2008-06-24 | The United States Of America As Represented By The Secretary Of The Air Force | Low cost night vision apparatus and cockpit lighting compatibility evaluation via visual acuity |
| CN103398837A (en) * | 2013-07-17 | 2013-11-20 | 中国人民解放军济南军区72465部队 | Reflected light path-based low-light level night vision device resolution detection method and device |
| CN204924617U (en) * | 2015-09-14 | 2015-12-30 | 中国人民解放军武汉军械士官学校 | Integration low -light level night vision device performance detects leading optical system |
| CN211717753U (en) * | 2019-10-22 | 2020-10-20 | 长春军晟科技有限公司 | External field performance testing device for photoelectric instrument |
| CN112731665A (en) * | 2020-12-31 | 2021-04-30 | 中国人民解放军32181部队 | Self-adaptive binocular stereoscopic vision low-light night vision head-mounted system |
| CN113686551A (en) * | 2021-08-20 | 2021-11-23 | 北方夜视技术股份有限公司 | Portable image intensifier resolution measuring device and measuring method |
| CN217878282U (en) * | 2022-06-23 | 2022-11-22 | 中国人民解放军32181部队 | External field optical performance detection device of visible light shimmer night vision instrument |
Non-Patent Citations (3)
| Title |
|---|
| 军用光学性能检测设备设计与分析;张勇 等;激光与红外;20221120;第1695-1700页 * |
| 基于机器视觉的微光夜视仪整机检测系统设计;江恒;王小兵;张晶;祝宝辉;;应用光学;20160515(第03期);第23-27页 * |
| 检测光学装备性能的装置;杨欣;;电子质量;20200520(第05期);第19-22页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114993629A (en) | 2022-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101907773B (en) | High-collimation solar simulator optical system with auto-collimation aiming system | |
| US8692995B2 (en) | Optical system for projecting an IR or UV test signal with optical alignment of the projection axis in the visible spectral region | |
| US7365838B2 (en) | System and method for the measurement of optical distortions | |
| US11650151B2 (en) | Compact, self-aligned projection focusing schlieren method and system | |
| CN103398837A (en) | Reflected light path-based low-light level night vision device resolution detection method and device | |
| CN113959469A (en) | Electronic internal focusing collimator | |
| CN217878282U (en) | External field optical performance detection device of visible light shimmer night vision instrument | |
| CN114993629B (en) | Method for detecting external field optical performance of visible light low-light night vision instrument | |
| CN113325390B (en) | Three-light axis adjusting method and system in fixed structure | |
| CN106247998A (en) | A kind of laser axis and the calibration method of reflecting mirror normal parallel | |
| CN108267114B (en) | Auto-collimation total station and working method thereof | |
| CN102749188B (en) | Detection device applied to optical system | |
| CN215296620U (en) | A Wide Range Distortion Measurement Device | |
| RU162917U1 (en) | TWO-MIRROR OPTICAL SYSTEM ADJUSTMENT DEVICE | |
| CN215218016U (en) | Off-axis target simulator for multi-spectral band composite photoelectric equipment focusing and axis adjustment | |
| CN114413683A (en) | A portable multi-condition universal axle alignment device | |
| Parks | Alignment using axicon plane gratings | |
| RU63054U1 (en) | LASER RANGEFINDER | |
| CN205121068U (en) | Big visual field collimator | |
| CN113847844B (en) | Optical axis consistency adjustment method and device for wide-spectrum multi-optical-path sighting platform | |
| CN216668747U (en) | Double-star simulator | |
| CN214843650U (en) | Multi-view-field wavefront measuring device | |
| CN221224167U (en) | Beam quality test and system optical axis calibration and adjustment system | |
| Jingbo et al. | Design of optical system for wide-area space-based detection camera for space debris | |
| RU2030773C1 (en) | Gear to test binocular devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |