CN114935446A - Miniaturized low-light-level night vision device resolution and field-of-view test system - Google Patents
Miniaturized low-light-level night vision device resolution and field-of-view test system Download PDFInfo
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Abstract
The invention discloses a system for testing the resolution and the field of view of a miniaturized low-light level night vision device, which comprises: the device comprises a light source system, a test target group, a low-light illuminometer, a radiance meter, an imaging objective lens assembly and a measured micro-light night vision device; the light source system is arranged in front of the test target group and provides uniform illumination for the test target group; the test target group comprises a resolution target and a field of view target; the weak light illuminometers and the radiance meters are arranged in parallel at corresponding positions on the rear side of the vacant positions of the test target group and are used for measuring and monitoring radiance and illuminance values at the target surface; the imaging objective assembly and the tested micro-light night vision device are sequentially arranged behind the testing target set, the testing target set is imaged and projected on the tested micro-light night vision device, and a tester observes the image of the resolution target or the view field target and gives a final resolution value or a view field value. The invention solves the problem of evaluating the resolution and the field of view parameters of the night vision device working in the visible wave band and the near-infrared wave band novel night vision device under the field condition, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of optical metering, relates to a parameter testing system of a low-light-level night vision device, and particularly relates to a resolution and field-of-view testing system of a miniaturized low-light-level night vision device.
Background
The role of low-light night vision technology in future high and new technology local wars and night wars becomes more prominent and important. The night war has become the main mode of the conventional local war of the high and new technology, and plays an extremely important role. The low-light level night vision device is produced in large quantities in the world, has clear imaging and convenient carrying, becomes an instrument necessary for the night battle of the informationized wars, and is widely applied to the field of night vision individual soldier reconnaissance, gun aiming, vehicle-mounted, airborne and other battles.
In the service of the low-light level night vision device, the small-sized low-light level night vision device measuring system is required to carry out on-site measurement and performance evaluation on parameters of the low-light level night vision devices of different types and different purposes in all links of the whole life cycle, such as on-site use, maintenance and repair, and the like, so that rapid and accurate measurement data are provided for the use, maintenance and repair of the low-light level night vision device.
The invention discloses a method and a device (ZL201510988632.8) for automatically detecting the resolution of a low-light-level night vision device, and relates to an automatic detecting device for the resolution of the low-light-level night vision device. In addition, a plurality of low-light level night vision device measuring devices for laboratories are developed domestically, generally comprise an integrating sphere light source, a reflective resolution target, a collimator objective lens and the like, and the test is completed in a laboratory with darkroom conditions.
In the field test of the low-light night vision device, the currently used test system has the following problems: 1) most of the prior low-light level night vision device resolution testing systems are laboratory measuring devices, all make the requirement that the laboratory environment is a darkroom, adopt a long-focus large-caliber collimator objective lens, and have no problem of interface with the measured low-light level night vision device; however, the low-light level night vision device is a device very sensitive to light radiation, and can be exposed to a more complicated test environment in field test, so that the shielding problem of environmental stray radiation, the interface problem of different types of night vision devices and the like need to be considered so as to meet the accurate measurement problem of field resolution parameters; 2) most of the existing parameter measurement systems for low-light level night vision devices aim at the test of night vision devices working in visible light wave bands, and aim at novel night vision devices working in near infrared wave bands, and a test device for evaluating the resolution isoparametric indexes of the night vision devices is not developed.
Disclosure of Invention
Objects of the invention
The purpose of the invention is: the system solves the problem of accuracy in field measurement and the problem of evaluation of parameters such as resolution of a night vision device working in a visible light band and a near-infrared band novel night vision device.
(II) technical scheme
In order to solve the above technical problem, the present invention provides a resolution and field test system for a miniaturized low-light level night vision device, comprising: the device comprises a light source system, a test target group, a low-light illuminometer, a radiance meter, an imaging objective lens assembly and a measured micro-light night vision device; the light source system is arranged in front of the test target group and provides uniform illumination for the test target group; the test target group comprises a resolution target and a field of view target; the weak light illuminometers and the radiance meters are arranged in parallel at corresponding positions on the rear side of the vacant positions of the test target group and are used for measuring and monitoring radiance and illuminance values at the target surface; the imaging objective assembly and the tested micro-light night vision device are sequentially arranged behind the testing target set, the testing target set is imaged and projected on the tested micro-light night vision device, and a tester observes the image of the resolution target or the view field target and gives a final resolution value or a view field value.
The light source system comprises an integrating sphere, a visible light source and a visible attenuation sheetThe system comprises a near-infrared light source, a near-infrared attenuation sheet, an adjustable power supply and an integrating sphere outlet; the integrating sphere outlet is arranged on one side of the integrating sphere facing the test target group; the visible light source and the near-infrared light source are arranged outside the integrating sphere; the visible light source generates visible light through the visible attenuation sheet and attenuates the visible light to ensure that the illumination of the target surface meets the requirement of GJB851-1990, i.e. the illumination of the target surface is (1 +/-10%) multiplied by 10 when the visible attenuation sheet does not exist -1 lx, the attenuation factor of the visible attenuation sheet is 100 times, and the illumination of the target surface is (1 + -10%) multiplied by 10 when the attenuation sheet is inserted -3 lx; the near-infrared light source and the near-infrared attenuation sheet are used for generating near-infrared light and attenuating the near-infrared light, i.e. the radiance of the target surface is 8.3 multiplied by 10 when the near-infrared attenuation sheet is not used -9 W/sr·cm 2 The attenuation multiple of the near infrared attenuation sheet is 243 times, and the radiance of the target surface is 3.41 multiplied by 10 when the target surface is inserted -11 W/sr·cm 2 (ii) a The adjustable power supply supplies power to the visible light source and the near infrared light source, and the target surface illumination and the radiance meet the requirement of no attenuation sheet by adjusting the voltage.
The test target group comprises two resolution targets, a view field target and an electric control rotating wheel, and is positioned at the outlet of the integrating sphere; the resolution target is a transmission type, comprises two types of contrast of 85-90% and 35-40%, and adopts a USAF1951 resolution test target; when the target surface illumination is (1 +/-10%). times.10 -1 lx or target surface radiance of 8.3X 10 -9 W/sr·cm 2 In the process, a resolution target with the contrast of 85-90% is adopted; when the target surface illumination is (1 +/-10%). times.10 -3 lx or target surface radiance of 3.41 × 10 -9 W/sr·cm 2 In the process, a resolution target with the contrast ratio of 35-40% is adopted; the visual field target adopts a glass-net plate, line groups which are different in interval and symmetrically distributed are etched on the visual field target, and two symmetrically distributed lines form a group and are provided with numbers; the resolution target and the field of view target are arranged on the electric control rotating wheel, the electric control rotating wheel is provided with 4 hole sites, and all the hole sites are positioned at the focus of the imaging objective lens assembly when rotating to the light path; 3 of the three targets are used for installing two resolution targets and field targets, and the remaining 1 is a vacancy which is used for monitoring radiance and a low-light illuminometer; in the test, the electric control rotating wheel is controlled to rotate the required resolution target or view field target to the outlet of the integrating sphere; the rotation of the electric control rotating wheel is realized by a motor driving circuit and corresponding software.
Detectors of the weak illuminometer and the radiance meter are arranged at the vacancy of the electric control rotating wheel in parallel and used for measuring and monitoring radiance and illuminance values at the target surface; the weak illuminometers and the radiance meters need to trace the source regularly or trace the source when the indication value is not correct.
The imaging objective lens assembly comprises an imaging objective lens and a mounting structure, the testing target group is imaged and projected on the tested micro-light night vision device, and a tester observes the image of the resolution target or the view field target and gives a final resolution value or a view field value; the mounting structure is threaded for mating with different types of adapters.
The whole machine shell comprises a measuring system shell, an adapter, a touchable display screen and a system circuit; the adapter can be matched with an installation mechanism of an imaging objective lens assembly so as to meet the requirements of night vision device measurement of different eye lens calibers and pupil distances; the inner wall of the shell of the measuring system is black so as to reduce the influence of stray light; the touchable display screen is embedded on the measuring system shell; the system circuit comprises a main control circuit, an electric control runner motor driving circuit, a radiance meter circuit and a low-light illuminometer circuit, and the mounting position of the system circuit is positioned on the inner wall of a measuring system shell; the light source system, the test target group, the radiance meter, the low-light illuminometer and the imaging objective lens assembly are arranged inside the measuring system shell.
The touchable display screen has the following functions: the tester selects a resolution or view field measurement interface according to the measured parameters; the resolution measurement interface has the functions of displaying illumination and radiance and selecting the group number and the unit number of the target line, and a tester can select the corresponding group number and the corresponding unit number according to the self observation result, so that the corresponding resolution value can be displayed; the field measurement interface has a line number selection function, and a tester selects a corresponding line according to the own observation result and can display a corresponding field value; and the display screen displays the radiance value or the illumination value of the target surface position in the current test state in real time.
The center of the exit of the integrating sphere, the optical axis of the imaging objective lens and the center of the adapter form a main optical axis of the testing system; when any hole position of the electric control rotating wheel rotates into the light path, the center of the electric control rotating wheel is positioned on the main optical axis; during measurement, when the measured micro-light night vision device is binocular, the geometric center of the binocular is positioned on the main optical axis; when the measured micro-light night vision device is monocular, the geometric center of the objective lens is positioned on the main optical axis.
The test steps of the resolution and field of view test system of the miniaturized low-light level night vision device are as follows:
step 1: for the low-light night vision device working in the visible light wave band, the visible light source is started, the electric control rotating wheel is rotated to enable the center of the vacant position to rotate to the main optical axis, the adjustable power supply is adjusted, the indication value of the touch display screen is observed, and the illumination of the target surface reaches (1 +/-10%) multiplied by 10 -1 lx；
Step 2: adjusting an electric control rotating wheel, and rotating the 85% -90% contrast resolution target to a main optical axis;
and 3, step 3: selecting a corresponding adapter according to the caliber and the interpupillary distance of an eyepiece of the measured micro-light night vision device, and aligning the measured micro-light night vision device to a main optical axis of the test system;
and 4, step 4: opening the measured micro-light night vision device, observing by a tester aiming at an eyepiece of the tester, observing black and white lines arranged at equal intervals on a resolution target through the measured micro-light night vision device, observing from a unit with low resolution to a unit with high resolution, finding out a unit number which can be distinguished by all lines in two directions, and representing the resolution of the measured micro-light night vision device at the moment;
and 5: after the group number and the unit number corresponding to the seen target line are selected by the touch display screen resolution module, the corresponding resolution value can be read by the tester, and the resolution value is calculated according to the formula (1):
in the formula: the resolution of the alpha-measured micro-light night vision device is mrad;
a-resolution target line width in mm;
f c -imaging objective lens assembly focal length in m.
And 6: adjusting an electric control rotating wheel, rotating a field target into a light path, observing symmetrically distributed lines at different intervals on the field target by a tester through a tested micro-light night vision device, and observing from a unit with a small interval to a unit with a large interval to find out the group of lines with the longest interval to represent the field of view of the tested micro-light night vision device;
and 7: after the number corresponding to the seen line is selected by the visual field module of the touch display screen, a tester can read the corresponding visual field value, and the visual field value is calculated according to a formula (2):
in the formula: 2 omega-field of view of the measured micro-optic night vision device in mrad;
l-field target line spacing in mm;
f c -imaging objective lens assembly focal length in m.
And step 8: inserting the visible attenuation sheet to make the target surface illumination reach (1 + -10%). times.10 -3 lx, adjusting the electric control rotating wheel, and rotating the 35% -40% contrast resolution target into the light path; repeating the step 4 and the step 5 to obtain a resolution value under the illumination condition;
and step 9: for low-light night vision device working in near-infrared band, the near-infrared light source is turned on, the adjustable power supply is regulated and the indication value of the display screen is observed, so that the target surface radiance reaches 8.3X 10 -9 W/sr·cm 2 Turning a 85% -90% contrast resolution target into a light path; repeating the step 3 to the step 5 to obtain a resolution value under the condition;
step 10: inserting the near infrared attenuation sheet to make the target surface radiance reach 3.41 × 10 -11 W/sr·cm 2 Adjusting an electric control rotating wheel, and rotating a 35% -40% contrast resolution target into a light path; and (5) repeating the step (4) and the step (5) to obtain the resolution value under the condition.
Further preferred embodiments: the number of target line sets etched by the resolution target can be determined according to the USAF1951 standard in combination with the resolution test specification.
Further preferred embodiments: the length and the interval of the etched lines of the visual field target can be determined by combining the specific requirements of the visual field test.
Further preferred embodiments: the sizes of the resolution target and the view field target can be determined according to specific test requirements, and then the size of the electric control rotating wheel is determined.
Further preferred embodiments: under the condition that the illumination or radiance of the target surface has other requirements, the illumination or radiance value of the position of the target surface is changed by adjusting the adjustable power supply, and the indication value is observed on the touch display screen to judge whether the test condition is met.
(III) advantageous effects
The system and the method for testing the resolution and the field of view of the miniaturized low-light-level night vision device have the following advantages that:
1) when the whole shell is designed, adapters for different types of night-vision devices are designed, so that the problems of interfaces with the measured micro-light night-vision device, the shielding problem of stray radiation and the accuracy problem in field measurement are solved;
2) the test system adopts visible and near-infrared light sources, and simultaneously solves the problem of evaluating parameters such as resolution of a night vision device working in a visible light wave band and a novel near-infrared wave band night vision device.
Drawings
Fig. 1 is a schematic view of a resolution and field test system of a miniaturized low-light level night vision device according to the present invention.
FIG. 2 is a resolution target design.
FIG. 3 is a view of a field target design.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
As shown in fig. 1 to 3, the system for testing the resolution and the field of view of the miniaturized low-light night vision device comprises a light source system, a test target set, a low-light illuminometer 3, a radiance meter 4, an imaging objective lens assembly, a complete machine shell and a tested low-light night vision device 7.
The light source system comprises1-1 integrating sphere, 1-2 visible light sources, 1-3 visible attenuation pieces, 1-4 near infrared light sources, 1-5 near infrared attenuation pieces, 1-6 adjustable power supplies and 1-7 integrating sphere outlets, and provides uniform illumination for the test target set; the visible light source 1-2 adopts a halogen tungsten lamp, the visible attenuation sheet 1-3 adopts a neutral attenuation sheet with the attenuation multiple of 100 times, namely, the illumination of the target surface is (1 +/-10%) multiplied by 10 when the visible attenuation sheet 1-2 is not provided -1 lx, target surface illuminance at insertion (1 + -10%) × 10 -3 lx; the near-infrared light source 1-3 adopts an LED light source with the center wavelength of 800nm, the attenuation multiple of the near-infrared attenuation sheet 1-4 is 243 times, namely the radiance of the target surface is 8.3 multiplied by 10 when the near-infrared attenuation sheet 1-4 is not provided -9 W/sr·cm 2 The radiance of the target surface at the time of insertion is 3.41 × 10 -11 W/sr·cm 2 (ii) a The adjustable power supply 1-6 supplies power to the visible light source 1-2 and the near infrared light source 1-4, and the target surface illumination and the radiance meet the requirement of no attenuation sheet by adjusting the voltage.
The test target group comprises a resolution target 2-1 with the contrast of 85% -90%, a resolution target 2-2 with the contrast of 35% -40%, a field-of-view target 2-3, a vacancy 2-4 and an electric control rotating wheel 2-5, and is positioned at an outlet 1-7 of the integrating sphere; resolution targets 2-1 and 2-2 were transmissive, using a USAF1951 resolution test target, circular in shape and 36mm in diameter; comprises 0 group to 5 groups, each group comprises 7 units; when the target surface illumination is (1 +/-10%). times.10 -1 lx or target surface radiance of 8.3 × 10 -9 W/sr·cm 2 Then, a resolution target 2-1 is adopted; when the target surface illumination is (1 +/-10%). times.10 -3 lx or target surface radiance of 3.41 × 10 -9 W/sr·cm 2 Then, adopting a resolution target 2-2; the viewing field target 2-3 adopts a glass-compass plate, 7 groups of symmetrically distributed lines are etched on the viewing field target, the innermost line is the 1 st group, the outermost line is the 7 th group, the intervals of the same group of lines from inside to outside are respectively 4mm, 7mm, 11mm, 14mm, 18mm, 21mm and 26mm, and the line lengths are sequentially 2.5mm, 4.5mm, 7mm, 8.5mm, 11mm, 13mm and 16 mm; the resolution targets 2-1 and 2-2 and the field of view target 2-3 are arranged on the electric control rotating wheel 2-5, the electric control rotating wheel 2-5 is provided with 4 hole sites, and all the hole sites are positioned at the focus of the imaging objective lens assembly when rotating to the light path; 3 of them are used for mounting two kinds of resolution targets and field-of-view targets, and the rest 1 is vacant 2-4 for radiance and weak light illuminationMonitoring by a meter; in the test, the electric control rotating wheel 2-5 is controlled to rotate the required resolution target or view field target to the outlet 1-7 of the integrating sphere; the rotation of the electric control rotating wheels 2-5 is realized by a motor driving circuit and corresponding software.
Detectors of the weak illuminometer 3 and the radiance meter 4 are arranged at vacant positions of the electrically controlled rotating wheels 2-5 in parallel and used for measuring and monitoring radiance and illuminance values at a target surface; the dim light illuminometer 3 and the radiance meter 4 need to trace back the source periodically or trace back the source when the indication value is not correct.
The imaging objective lens assembly comprises an imaging objective lens 5-1 and a mounting structure 5-2, a test target group is imaged and projected on a tested micro-light night vision device 7, a tester observes an image of a resolution target or a view field target and gives a final resolution value or a view field value; the aperture of the imaging objective lens is 5-1 mm, and the focal length is 200 mm; the mounting structure 5-2 is threaded for mating with different types of adapters.
The whole machine shell-1 comprises a measurement system shell 6-1, an adapter 6-2, a touchable display screen 6-3 and a system circuit 6-4; the adapter 6-2 can be matched with the imaging objective lens assembly mounting mechanism 5-2 so as to meet the requirements of night vision device measurement of different ocular apertures and pupil distances; the inner wall 6-1 of the shell of the measuring system is black to reduce the influence of stray light, and is provided with a main control circuit, an electric control runner motor driving circuit, a radiance meter and a low-light illuminometer circuit mounting position; the touchable display screen 6-3 is embedded on the measurement system shell 6-1; the light source system, the test target group, the low-light illuminometer 3, the radiance meter 4 and the imaging objective lens assembly are arranged inside the measuring system shell 6-1; the touchable display screen 6-3 has the following functions: the tester selects a resolution or a view field measurement interface according to the measured parameters; the resolution measurement interface has the functions of displaying illumination and radiance and selecting the group number and the unit number of the target line, and a tester can select the corresponding group number and the corresponding unit number according to the self observation result, so that the corresponding resolution value can be displayed; the field measurement interface has a line number selection function, and a tester selects a corresponding line according to an observation result of the tester and can display a corresponding field value; and the display screen displays the radiance value or the illumination value of the target surface position in the current test state in real time.
The measured micro-optic night vision device 7 operates in the visible or near infrared band or is responsive to both bands.
The center 1-7 of the exit of the integrating sphere, the optical axis of the imaging objective lens 5-1 and the center of the adapter 6-2 form a main optical axis of the testing system; when any hole position of the electric control rotating wheel 2-5 rotates into the light path, the center of the electric control rotating wheel is positioned on the main optical axis; during measurement, when the measured micro-light night vision device is binocular, the geometric center of the binocular is positioned on the main optical axis; when the measured micro-light night vision device is monocular, the geometric center of the objective lens is positioned on the main optical axis.
The test steps of the resolution and field of view test system of the miniaturized low-light level night vision device are as follows:
step 1: for the low-light night vision device working in the visible light wave band, the visible light source 1-2 is started, the electric control rotating wheel 2-5 is rotated to enable the center of the vacant position to rotate to the main optical axis, the adjustable power supply 1-6 is adjusted and the indication value of the touch display screen 6-3 is observed, so that the illumination of the target surface reaches (1 +/-10 percent) multiplied by 10 -1 lx；
Step 2: adjusting the electric control rotating wheel 2-5, and rotating the resolution target 2-1 to the main optical axis;
and step 3: selecting a corresponding adapter 6-2 according to the caliber and the interpupillary distance of an eyepiece 7 of the measured micro-light night vision device, and aligning the measured micro-light night vision device 7 to a main optical axis of the test system;
and 4, step 4: opening the measured micro-light night vision device 7, observing by a tester aiming at an eyepiece of the tester, observing black and white lines which are arranged at equal intervals on a resolution target through the measured micro-light night vision device 7, observing from a unit with low resolution to a unit with high resolution, finding out a unit number which can be distinguished by all lines in two directions, and representing the resolution of the measured micro-light night vision device 7 at the moment;
and 5: after the tester selects the group number and the unit number corresponding to the seen target line in the resolution module of the touchable display screen 6-3, the corresponding resolution value can be read, and the resolution value is calculated according to the formula (1):
in the formula: the resolution of the alpha-measured micro-light night vision device is mrad;
a-resolution target line width in mm;
f c -imaging objective lens assembly focal length in m.
Step 6: adjusting the electric control rotating wheel 2-5, rotating the view field target 2-3 into a light path, observing the symmetrically distributed lines at different intervals on the view field target 2-3 by a tester through the tested micro-light night vision device 7, and observing from the unit with small interval to the unit with large interval to find out the pair of lines with the longest interval which can be seen to represent the view field of the tested micro-light night vision device 7;
and 7: after the tester selects the number corresponding to the line to be seen in the field-of-view module of the touchable display screen 6-3, the tester can read the corresponding field-of-view value, and the field-of-view value is calculated according to the formula (2):
in the formula: 2 omega-field of view of the measured micro-optic night vision device in mrad;
l-field target line spacing in mm;
f c -imaging objective lens assembly focal length in m.
And 8: inserting the visible attenuation sheet 1-3 to make the target surface illumination reach (1 + -10%) x 10 -3 lx, adjusting the electrically controlled rotating wheel 2-5, and rotating the resolution target 2-2 into the light path; repeating the step 4 and the step 5 to obtain a resolution value under the illumination condition;
and step 9: for the tested micro-light night vision device 7 working in the near-infrared band, the visible light source 1-2 is turned off, the near-infrared light source 1-4 is turned on, the adjustable power supply 1-6 is adjusted, and the indication value of the touchable display screen 6-3 is observed, so that the target surface radiance reaches 8.3 multiplied by 10 - 9 W/sr·cm 2 Turning the resolution target 2-1 into the light path; repeating the step 3 to the step 5 to obtain a resolution value under the condition;
step 10: inserting the near infrared attenuation sheet 1-5 to make the target surface radiance reach 3.41 × 10 -11 W/sr·cm 2 Adjusting the electric control rotating wheel 2-5, and rotating the resolution target 2-2 into the light path; and (5) repeating the step (4) and the step (5) to obtain the resolution value under the condition.
According to the technical scheme, the invention solves the problem of evaluating the resolution and the field of view parameters of the night vision device working in the visible wave band and the near-infrared wave band novel night vision device under the field condition, and has wide application prospect.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A miniaturized low-light level night vision device resolution and field of view testing system, comprising: the device comprises a light source system, a test target group, a low-light illuminometer, a radiance meter, an imaging objective lens assembly and a measured micro-light night vision device; the light source system is arranged in front of the test target group and provides uniform illumination for the test target group; the test target group comprises a resolution target and a field of view target; the weak light illuminometers and the radiance meters are arranged in parallel at corresponding positions on the rear side of the vacant positions of the test target group and are used for measuring and monitoring radiance and illuminance values at the target surface; the imaging objective assembly and the tested micro-light night vision device are sequentially arranged behind the testing target set, the testing target set is imaged and projected on the tested micro-light night vision device, and a tester observes an image of the resolution target or the view field target and gives a final resolution value or a view field value.
2. The miniaturized low-light night vision device resolution and field of view testing system of claim 1, wherein the light source system comprises an integrating sphere, a visible light source, a visible attenuator, a near infrared light source, a near infrared attenuator, an adjustable power supply, and an integrating sphere outlet; the integrating sphere outlet is arranged on one side of the integrating sphere facing the test target group; the visible light source and the near-infrared light source are arranged outside the integrating sphere; the visible light source generates visible light through the visible attenuation sheet and attenuates the visible light, and the near-infrared light source generates near-infrared light through the near-infrared attenuation sheet and attenuates the near-infrared light; the adjustable power supply supplies power to the visible light source and the near infrared light source, and the target surface illumination and the radiance meet the requirement of no attenuation sheet by adjusting the voltage.
3. The miniaturized low-light night vision device resolution and field of view testing system of claim 2, wherein the set of test targets is located at an exit of the integrating sphere, the set of test targets comprising two resolution targets and one field of view target; the resolution target is a transmission type, comprises two types of contrast of 85% -90% and 35% -40%, and adopts a USAF1951 resolution test target; when the target surface illumination is (1 +/-10%) × 10 -1 lx or target surface radiance of 8.3 × 10 -9 W/sr·cm 2 In the process, a resolution target with the contrast ratio of 85-90% is adopted; when the target surface illumination is (1 +/-10%). times.10 -3 lx or target surface radiance of 3.41 × 10 -9 W/sr·cm 2 In the process, a resolution target with the contrast ratio of 35-40% is adopted; the visual field target adopts a glass-net plate, line groups which are different in interval and symmetrically distributed are etched on the visual field target, and two symmetrically distributed lines form a group and are provided with numbers.
4. The system of claim 3, wherein the set of test targets further comprises an electrically controlled wheel having 4 holes, 3 of which are used to mount two resolution targets and a field of view target, and the remaining 1 is a vacant position, and all holes are located at the focus of the imaging objective lens assembly when rotated into the optical path; in the test, the electric control rotating wheel is controlled to rotate the required resolution target or the required view field target to the outlet of the integrating sphere.
5. The system of claim 4 wherein the imaging objective assembly comprises an imaging objective and a mounting structure with threads for mating with different types of adapters to meet night vision measurement of different eye piece diameters and interpupillary distances.
6. The miniaturized low-light level night vision device resolution and field of view testing system of claim 5, further comprising: the whole machine shell comprises a test system shell, an adapter and a touchable display screen; the adapter is matched with a mounting mechanism of the imaging objective lens assembly; the inner wall of the shell of the test system is black, and a light source system, a test target group, a low-light illuminometer, a radiance meter and an imaging objective lens assembly are arranged in the shell of the test system; the touchable display screen is embedded on the measurement system shell.
7. The system for testing the resolution and the field of view of a miniaturized low-light level night vision device of claim 6, wherein the center of the exit of the integrating sphere, the optical axis of the imaging objective lens and the center of the adapter form a main optical axis of the testing system; when any hole position of the electric control rotating wheel rotates into the light path, the center of the electric control rotating wheel is positioned on the main optical axis; during measurement, when the measured micro-light night vision device is binocular, the geometric center of the binocular is positioned on the main optical axis; when the measured micro-light night vision device is monocular, the geometric center of the objective lens is positioned on the main optical axis.
8. A method for testing the resolution and field of view of a miniaturized low-light night vision device, based on the system for testing the resolution and field of view of a miniaturized low-light night vision device of claim 7, the method comprising the steps of:
step 1: for the low-light night vision device working in the visible light wave band, the visible light source is started, the electric control rotating wheel is rotated to enable the center of the vacant position to rotate to the main optical axis, the adjustable power supply is adjusted, the indication value of the touch display screen is observed, and the illumination of the target surface reaches (1 +/-10%) multiplied by 10 -1 lx；
Step 2: adjusting an electric control rotating wheel, and rotating the 85% -90% contrast resolution target to a main optical axis;
and step 3: selecting a corresponding adapter according to the caliber and the interpupillary distance of an eyepiece of the measured micro-light night vision device, and aligning the measured micro-light night vision device to a main optical axis of the test system;
and 4, step 4: opening the measured micro-light night vision device, observing by a tester aiming at an eyepiece of the tester, observing black and white lines arranged at equal intervals on a resolution target through the measured micro-light night vision device, observing from a unit with low resolution to a unit with high resolution, finding out a unit number which can be distinguished by all lines in two directions, and representing the resolution of the measured micro-light night vision device at the moment;
and 5: after a tester selects the group number and the unit number corresponding to the seen target line in the resolution module of the touch display screen, reading the corresponding resolution value, and calculating the resolution value according to the formula (1):
in the formula: α -resolution of the measured micro-optic night vision device in mrad;
a-resolution target line width in mm;
f c -the focal length of the imaging objective lens assembly in m;
step 6: adjusting an electric control rotating wheel, rotating a field target into a light path, observing symmetrically distributed lines at different intervals on the field target by a tester through a tested micro-light night vision device, and observing from a unit with a small interval to a unit with a large interval to find out the group of lines with the longest interval to represent the field of view of the tested micro-light night vision device;
and 7: after the tester selects the number corresponding to the line to be seen by the field-of-view module of the touch display screen, the tester can read the corresponding field-of-view value, and the field-of-view value is calculated according to the formula (2):
in the formula: 2 omega-field of view of the measured micro-optic night vision device in mrad;
l-field target line spacing in mm;
f c -the focal length of the imaging objective lens assembly in m;
and 8: inserting the visible attenuation sheet to make the target surface illumination reach (1 + -10%). times.10 -3 lx, adjusting the electric control rotating wheel to divide 35% -40% of contrastThe force-distinguishing target is rotated into the light path; repeating the step 4 and the step 5 to obtain a resolution value under the illumination condition;
and step 9: for low-light night vision device working in near-infrared band, the near-infrared light source is turned on, the adjustable power supply is regulated and the indication value of the display screen is observed, so that the target surface radiance reaches 8.3X 10 -9 W/sr·cm 2 Turning a 85% -90% contrast resolution target into a light path; repeating the step 3 to the step 5 to obtain a resolution value under the condition;
step 10: inserting the near infrared attenuation sheet to make the target surface radiance reach 3.41 × 10 -11 W/sr·cm 2 Adjusting an electric control rotating wheel, and rotating a 35% -40% contrast resolution target into a light path; and (5) repeating the step 4 and the step 5 to obtain the resolution value under the condition.
9. The method for testing the resolution and the field of view of the miniaturized low-light level night vision device as claimed in claim 8, wherein the number of target line groups etched by the resolution target is determined according to the resolution test requirement on the resolution target according to the USAF1951 standard; and on the visual field target, determining the length and the interval of the etching lines of the visual field target according to the visual field test requirement.
10. The method of claim 9 wherein the dimensions of the resolution target and the field of view target, and hence the electrically controlled wheel, are determined based on the test requirements.
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