CN110068445B - Infrared visual simulation system and radiation field joint regulation and control method thereof - Google Patents

Infrared visual simulation system and radiation field joint regulation and control method thereof Download PDF

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CN110068445B
CN110068445B CN201910331694.XA CN201910331694A CN110068445B CN 110068445 B CN110068445 B CN 110068445B CN 201910331694 A CN201910331694 A CN 201910331694A CN 110068445 B CN110068445 B CN 110068445B
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black body
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王晓蕊
赵贞顺
张超
卢帅
王胜
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Xidian University
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Abstract

The invention discloses an infrared visual simulation system and a radiation field joint regulation and control method thereof, which solve the joint regulation and control problem of an infrared digital scene and an infrared target simulator. The DMD control and drive circuit in the simulation system controls the image frame synchronization between the imaging device and the infrared digital scene unit. And adjusting the image radiation brightness and the black body light source temperature of the infrared digital scene unit to realize the joint regulation and control of the simulation system. The combined regulation and control method of the radiation field is that on the basis of a simulation system, the relation between the radiation brightness of an infrared digital scene unit and the black body light source temperature of a DMD infrared target simulator and the transmittance of a spatial light modulator is established item by item, a radiation illumination transfer model at the exit pupil of the target simulator is established, the quantization range of the image radiation brightness and the range of the black body light source temperature are determined, a system full-link radiation regulation and control model is established, a black body radiation brightness and temperature comparison table is made and searched, the parameters of the regulation and control model are determined, and the combined regulation and control of the radiation field. The method is used for infrared scene image simulation.

Description

Infrared visual simulation system and radiation field joint regulation and control method thereof
Technical Field
The invention belongs to the technical field of semi-physical simulation, mainly relates to infrared visual simulation, and particularly relates to an infrared visual simulation system and a radiation field joint regulation and control method thereof, which are used for performing high-fidelity simulation on an infrared image.
Background
With the increasing maturity of semi-physical simulation technology and computer software and hardware conditions, the infrared visual simulation system draws more and more attention, is widely applied to the performance identification test of military photoelectric reconnaissance equipment, and has the advantages of low cost, convenient application and the like compared with the traditional outfield test. However, the success of such application test of the semi-physical simulation system depends largely on the simulation fidelity of the infrared vision simulation system, i.e. the true degree of the infrared vision simulation system reproducing the complex real natural environment.
Most domestic researches are limited to the fidelity research on infrared digital scene simulation or the fidelity research on an infrared target simulator, and the system-level research on an infrared visual simulation system is lacked.
The invention searches for new information in a certain range, relates to research and report of an infrared digital scene, and researches on infrared radiation modeling, infrared texture design and atmosphere transmission modeling in the infrared digital scene by Zhang Qin, Huangxi and other people so that the infrared digital scene can reflect a real natural environment, but the problem that the image brightness quantization range in the infrared digital scene is matched with the dynamic range of an infrared imaging device when the infrared digital scene is applied to an infrared visual simulation system is not considered. For example, the fidelity of an infrared digital scene is improved by establishing a global radiation model, a three-dimensional geometric scale conversion model and a position and posture conversion model, but the problems caused by the application of the infrared digital scene to an infrared visual simulation system are not considered, such as the fidelity of radiation, geometry and position and posture of targets in an infrared image after an image signal of an infrared digital scene unit is projected and transmitted by an infrared target simulator, and the problems of response dynamic ranges of the infrared digital scene unit and an infrared imaging and display device.
Also, regarding research and report on DMD infrared target simulator, people of Yong Qiang, Gunn, Hanqing, etc. have studied the diffraction characteristics, energy conversion efficiency, display frame frequency, etc. of the micro-lens in the DMD infrared target simulator, and have improved the uniformity of light source illumination, light energy utilization rate, display frame frequency, etc. in the DMD infrared target simulator, but do not consider the parameter coupling of the DMD infrared target simulator to the infrared scene simulation system and the infrared digital scene and the infrared imaging device. The research on the infrared target simulator is to simply improve the fidelity of the target simulator by changing an illumination light source, a projection optical system, a control circuit and the like of the target simulator from the self structure of the infrared target simulator.
In the existing research, one part of research is focused on improving the fidelity of an infrared digital scene, the other part of research is focused on improving the fidelity of an infrared target simulator, and the research of combining the infrared digital scene and the infrared target simulator is not available.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an infrared visual simulation system with higher fidelity and combined regulation and control of a radiation field, which is sequentially connected with an infrared digital scene module, an infrared target simulator and infrared imaging and display equipment based on a computer according to the signal transmission direction of the simulation system, wherein the infrared digital scene generation module is sequentially connected with an infrared image input unit to be simulated, a simulation scene generation unit and an infrared digital scene unit according to the signal transmission direction. The black body light source irradiates on the micro-reflector array, and the DMD control and driving circuit simultaneously performs data bidirectional interaction with the infrared imaging and display equipment and the infrared digital scene unit, and controls image signal frame synchronization. The radiation field joint regulation and control of the infrared visual simulation are realized by adjusting the image radiation brightness of the infrared digital scene unit and the temperature of a black body light source in the DMD infrared target simulator.
The invention also relates to a radiation field joint regulation and control method of an infrared vision simulation system, which is characterized by comprising the following steps:
(1) constructing an infrared visual simulation system; the infrared visual simulation system is an infrared visual simulation system with combined regulation and control of a radiation field, and is sequentially connected with a computer-based infrared digital scene generation module, a DMD infrared target simulator and an infrared imaging and display device according to the signal transmission direction of the simulation system; the infrared digital scene generation module is sequentially connected with an infrared image input unit to be simulated, a simulation scene generation unit and an infrared digital scene unit according to a signal transmission direction, a DMD control and drive circuit, a micro-mirror array and a collimation projection optical system are sequentially connected in the DMD infrared target simulator according to an infrared image signal processing direction, a black body light source capable of adjusting temperature is irradiated on the micro-mirror array, the DMD control and drive circuit simultaneously performs data bidirectional interaction with the infrared imaging and display equipment and the infrared digital scene unit, and controls image signal frame synchronization, and radiation field joint regulation and control of infrared visual scene simulation are realized by adjusting the image radiation brightness of the infrared digital scene unit and the black body light source temperature in the DMD infrared target simulator;
(2) constructing a relation g (x, y) between the transmittance of the spatial light modulator and the radiance of an infrared digital scene unit: defining the transmittance of the spatial light modulator as a normalization result of gray level modulation on image radiation brightness at different positions in the infrared digital scene unit, carrying out gray level modulation on images at different positions in the infrared digital scene unit within an image radiation brightness quantization range of the infrared digital scene unit to obtain image radiation brightness values at different positions, and establishing a relationship between the transmittance of the spatial light modulator and the radiation brightness of the infrared digital scene unit as a basis for regulating and controlling the transmittance of the spatial light modulator by the radiation brightness of the infrared digital scene unit;
(3) constructing a relation between the radiance of the infrared digital scene unit and the temperature of the black body light source of the DMD infrared target simulator: establishing a relation between the temperature of the black body light source and the image radiation brightness of the infrared digital scene unit to obtain the temperature of the black body light source corresponding to the maximum radiation brightness of the image in the infrared digital scene unit, wherein the temperature of the black body light source is used as a basis for regulating and controlling the temperature of the black body light source by the radiation brightness of the infrared digital scene unit;
(4) building a radiation illumination transfer model E at the exit pupil of the DMD infrared target simulatorExit pupil: establishing an irradiance transfer model at the exit pupil of the collimating projection optical system of the DMD infrared target simulator, and obtaining a transfer model of the radiation brightness of the black body light source, the radiation brightness of the infrared digital scene unit and the irradiance at the exit pupil by utilizing the relation between the radiation brightness of the infrared digital scene unit and the black body light source temperature and the transmittance of the spatial light modulator of the DMD infrared target simulator;
(5) determining the image radiation brightness quantization range and the black body light source temperature range of the infrared digital scene unit participating in the joint regulation: setting a temperature range of a black body light source and a range of an image radiation brightness quantization scale of an infrared digital scene unit according to a signal transfer function of a static performance test of the infrared imaging equipment and a corresponding response dynamic range (S-shaped curve), wherein in the setting, the image radiation brightness quantization range of the infrared digital scene unit, the dynamic response range of the infrared imaging equipment and the image brightness quantization scale thereof are all kept consistent;
(6) constructing a full-link radiation regulation and control model of the infrared visual simulation system: enabling the distribution of the radiation field at the exit pupil of the infrared visual simulation system to be consistent with that of the real scene at the entrance pupil of the infrared imaging equipment, so as to establish a full-link radiation regulation and control model of the infrared visual simulation system;
(7) preparing a comparison table of radiation brightness and temperature of the black body light source: the blackbody radiation exitance M is a function related to the temperature T, and a comparison table of the blackbody light source radiation brightness and the blackbody light source temperature is established through multiple times of calculation by utilizing the relation between the blackbody radiation exitance and the radiation brightness in a formula M-pi L;
(8) determining parameters of a regulation model: according to the quantization range of the image radiation brightness of the set infrared digital scene unit, calculating by using a full-link radiation regulation and control model of the infrared visual simulation system to obtain a black body light source radiation brightness value, searching a comparison table of the black body radiation brightness and the temperature to obtain a theoretical calculation result of the black body light source temperature;
(9) jointly regulating and controlling the radiation field of the infrared visual simulation system: and setting the quantization range of the image radiation brightness of the infrared digital scene unit and the temperature of the black body light source by using the determined regulation and control model parameters, and vividly reproducing the infrared radiation scene on the infrared imaging and display equipment.
The energy transfer process of the DMD infrared target simulator is comprehensively considered, and a radiation illumination transfer model at the exit pupil of the DMD infrared target simulator is established; and (3) integrating the energy transfer efficiency of the DMD infrared target simulator and the influence of substrate radiation, establishing a full-link radiation regulation and control model of the infrared visual simulation system, determining the theoretical relationship between the image radiation brightness quantization range of the infrared digital scene unit and the black body light source temperature of the DMD infrared target simulator, and realizing combined regulation and control.
Compared with the prior art, the invention has the following advantages:
firstly, the fidelity of the infrared visual simulation is improved: different from the previous research, the invention integrally considers the infrared visual simulation system, analyzes the whole link energy transfer process of the infrared visual simulation system and the adjustable factors in the system, and jointly adjusts and controls the infrared digital scene unit and the DMD infrared target simulator, thereby improving the fidelity of the infrared visual simulation system, enabling the infrared visual simulation system to project infrared radiation with higher fidelity, and being capable of reproducing the infrared radiation distribution of a real natural environment.
Secondly, the operation is simple, and the regulation and control are easy: the invention establishes the full-link radiation regulation and control model of the infrared visual simulation system, only needs to regulate and control the radiation brightness quantization range of the infrared digital scene unit and the black body light source temperature of the DMD infrared target simulator, has simple operation and easy regulation and control, and realizes the combined regulation and control of the infrared visual simulation system.
Drawings
FIG. 1 is a schematic diagram of an infrared scene simulation system according to the present invention;
FIG. 2 is a flow chart of a combined control method for radiation field of the infrared vision simulation system according to the present invention;
FIG. 3 is a responsivity curve of DC-coupled imaging in an infrared imaging device;
FIG. 4 is a graph of responsivity of AC-coupled imaging in an infrared imaging device.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The infrared visual simulation system belongs to a semi-physical simulation system, and is widely applied to performance identification tests of military photoelectric reconnaissance equipment, such as detection, identification and tracking performances of targets of infrared photoelectric equipment. The semi-physical simulation system can complete a test experiment under indoor conditions, and has the advantages of low cost, convenience in application and the like compared with the traditional outfield experiment. However, the success of the application test of such a semi-physical simulation system depends largely on the simulation fidelity of the infrared visual simulation system, i.e. the true degree of the infrared visual simulation system reproducing a complex real natural environment.
In the prior art, the method is dedicated to the fidelity research of the infrared digital scene, or the fidelity is improved through the improvement in the infrared target simulator, but research and report for combining the infrared digital scene and the infrared target simulator are not available, and the analysis of the full link of the infrared visual simulation system is not available.
The invention also provides an infrared visual simulation system with combined regulation and control of radiation fields, which is called a simulation system for short, through deep research and continuous discussion on the infrared visual simulation system. Referring to fig. 1, an infrared digital scene generation module, an infrared target simulator and an infrared imaging and display device based on a computer are sequentially connected according to a signal transmission direction of a simulation system, the infrared digital scene generation module is sequentially connected with an infrared image input unit to be simulated, a simulation scene generation unit and an infrared digital scene unit according to the signal transmission direction, the infrared target simulator is a DMD infrared target simulator, referring to fig. 1, a DMD control and drive circuit, a micro-mirror array and a collimation projection optical system are sequentially connected in the DMD infrared target simulator according to an infrared image signal processing direction, and an output of the collimation optical system is an exit pupil of the infrared visual simulation system; the black body light source capable of adjusting the temperature irradiates on the micro-reflector array, and the DMD control and driving circuit simultaneously performs data bidirectional interaction with the infrared imaging and display equipment and the infrared digital scene unit, and controls the frame synchronization of image signals. That is to say, the DMD control and driving circuit bidirectionally interacts data with the infrared imaging and display device and controls frame synchronization of image signals. The DMD control and drive circuit and the infrared digital scene unit are also in data bidirectional interaction, and control image signal frame synchronization.
The output image signal of the infrared digital scene unit is transmitted to the DMD control and drive circuit, the DMD control and drive circuit processes the output image signal and controls the opening and closing states of the micro-reflector, the micro-reflector reflects the infrared radiation emitted by the black body light source into the collimation projection optical system when in the opening state, the infrared radiation field projected by the collimation projection optical system is collected and imaged at the exit pupil by the infrared imaging device, and the projected imaging result is displayed in the display device. The DMD driving and control circuit participates in control, and the frame frequency of the infrared digital scene unit is ensured to be synchronous with the frame of an image output by the infrared imaging equipment. The radiation field joint regulation and control of the infrared visual simulation are realized by adjusting the image radiation brightness of the infrared digital scene unit and the temperature of a black body light source in the DMD infrared target simulator.
In order to improve the fidelity of an infrared visual simulation system, many researches are limited to the fidelity research of infrared digital scene simulation or the fidelity research of an infrared target simulator, and combined researches on the infrared digital scene and the infrared target simulator are lacked. The invention constructs an infrared visual simulation system with combined regulation and control of a radiation field on the whole, associates the adjustable parameters in the infrared digital scene unit and the DMD infrared target simulator, and realizes the control of the radiation brightness of the infrared digital scene unit on the blackbody light source temperature and the transmittance of the spatial light modulator in the DMD infrared target simulator. The image radiation brightness quantization range of the infrared digital scene unit is set to be consistent with the response dynamic range and the image brightness quantization scale of the infrared imaging and display equipment, and the corresponding range of the black body light source temperature is set at the same time, so that the coupling of the image brightness quantization range of the infrared digital scene unit, the black body light source temperature of the DMD infrared target simulator, the dynamic response range of the infrared imaging equipment and the image brightness quantization scale is the key for effective combined regulation and control.
Example 2
The overall structure of the infrared visual simulation system with the combined regulation and control of the radiation field is the same as that of the embodiment 1, the infrared target simulator is a DMD infrared target simulator, a window for manually setting the radiation brightness of the scene image is arranged in an infrared digital scene unit, a black body light source in the DMD infrared target simulator is provided with a temperature parameter setting button, and the combined regulation and control of the radiation field of the infrared visual simulation is realized through a DMD driving and control circuit by utilizing the combined regulation and control relationship of the radiation field, in which the quantization range of the image radiation brightness of the infrared digital scene unit and the temperature of the black body light source correspond to each other one by one.
The infrared digital scene unit is internally provided with a window for manually setting the image brightness, the image radiation brightness quantization range of the infrared digital scene unit can be manually set in the window, the temperature of the black body light source can be manually set through a temperature parameter setting button of the black body light source in the DMD infrared target simulator, a certain radiation brightness range is manually set in the quantization range of the image radiation brightness of the infrared digital scene unit by utilizing the radiation field joint regulation relationship of the image radiation brightness quantization range of the infrared digital scene unit and the black body light source temperature in one-to-one correspondence, the corresponding temperature range is arranged on the black body light source corresponding to the radiation brightness quantization range, and the temperature is manually set to realize the radiation field joint regulation and control of the infrared visual scene simulation system.
Example 3
The invention is also a radiation field joint regulation and control method of an infrared vision simulation system, which is realized on the infrared vision simulation system with the radiation field joint regulation and control, the overall composition of the infrared vision simulation system with the radiation field joint regulation and control is the same as that of the embodiment 1-2, see fig. 2, and the method comprises the following steps:
(1) constructing an infrared visual simulation system; the infrared visual simulation system is an infrared visual simulation system with combined regulation and control of a radiation field, and is sequentially connected with a computer-based infrared digital scene generation module, a DMD infrared target simulator and an infrared imaging and display device according to the signal transmission direction of the simulation system. The infrared digital scene generation module is sequentially connected with an infrared image input unit to be simulated, a simulation scene generation unit and an infrared digital scene unit according to a signal transmission direction, a DMD control and drive circuit, a micro-mirror array and a collimation projection optical system are sequentially connected in the DMD infrared target simulator according to an infrared image signal processing direction, a black body light source capable of adjusting temperature is irradiated on the micro-mirror array, the DMD control and drive circuit is simultaneously in data bidirectional interaction with the infrared imaging and display equipment and the infrared digital scene unit, and image signal frame synchronization is controlled, and radiation field joint regulation and control of infrared visual scene simulation are achieved by adjusting image radiation brightness of the infrared digital scene unit and temperature of the black body light source in the DMD infrared target simulator.
In the existing research on infrared visual simulation systems, the system generally comprises an infrared digital scene, an infrared target simulator and an infrared imaging and display device, wherein the infrared target simulator mainly comprises a target simulator based on a MOS thermal resistance array, a laser diode, an IR-CRT, an IR liquid crystal light valve and a digital micromirror device. The invention selects an infrared target simulator based on a digital micromirror device, namely a DMD infrared target simulator, in the DMD infrared target simulator, a standard black body light source is selected as an illumination light source, and the key point is that the invention establishes the relation between the temperature of the black body light source and the radiation brightness of an infrared digital scene unit in an infrared digital scene generation module, combines the DMD infrared target simulator and the infrared digital scene unit, and realizes the joint regulation and control of an infrared visual simulation system.
(2) Constructing a relation g (x, y) between the transmittance of the spatial light modulator and the radiance of an infrared digital scene unit: defining the transmittance of the spatial light modulator as a normalization result of gray-scale modulation on image radiation brightness at different positions in the infrared digital scene unit, performing gray-scale modulation on images at different positions in the infrared digital scene unit within a quantization range of the image radiation brightness of the infrared digital scene unit to obtain image radiation brightness values at different positions, establishing a relationship between the transmittance of the spatial light modulator and the radiation brightness of the infrared digital scene unit, and using the relationship as a basis for regulating and controlling the transmittance of the spatial light modulator by the radiation brightness of the infrared digital scene unit, namely establishing a one-to-one correspondence relationship between the transmittance of the spatial light modulator and the radiation brightness of the infrared digital scene unit within the quantization range.
(3) Constructing a relation between the radiance of the infrared digital scene unit and the temperature of the black body light source of the DMD infrared target simulator: and establishing a relation between the temperature of the black body light source and the image radiation brightness of the infrared digital scene unit to obtain the temperature of the black body light source corresponding to the maximum image radiation brightness in the infrared digital scene unit, wherein the temperature of the black body light source is used as a basis for regulating and controlling the temperature of the black body light source by the radiation brightness of the infrared digital scene unit.
(4) Building DMD Infrared targetsRadiation illumination transfer model E at exit pupil of simulatorExit pupil: establishing an irradiance transfer model at the exit pupil of the collimating projection optical system of the DMD infrared target simulator, and obtaining the irradiance transfer model at the exit pupil of the DMD infrared target simulator by utilizing the relationship between the radiance of an infrared digital scene unit, the blackbody light source temperature of the DMD infrared target simulator and the transmittance of a spatial light modulator; referring to fig. 1, the exit pupil of the DMD infrared target simulator is the exit pupil of the infrared view simulation system, and the transfer model constructed by the present invention is related to the temperature of the black body light source and is also related to the radiation brightness of the infrared digital scene unit.
(5) Determining the image radiation brightness quantization range and the black body light source temperature range of the infrared digital scene unit participating in the joint regulation: and setting the quantization ranges of the black body light source temperature and the image radiation brightness of the infrared digital scene unit according to the signal transfer function of the static performance test of the infrared imaging equipment and the corresponding response dynamic range (S-shaped curve), wherein in the setting, the quantization ranges of the image radiation brightness of the infrared digital scene unit are consistent with the dynamic response range of the infrared imaging equipment and the image radiation brightness quantization scale of the infrared imaging equipment. Referring to fig. 3, fig. 3 is a responsivity curve of dc-coupled imaging of the infrared imaging device, where L in the abscissa of fig. 3 represents radiance and V in the ordinate represents output voltage. The saturation temperature of the DC-coupled imaging responsivity curve in the infrared imaging device is the maximum temperature which can be set by the temperature of the black body light source, the maximum linear input range of the responsivity curve is the maximum quantization range of the radiance of the infrared digital scene unit, and the quantization range of the radiance corresponding to the infrared digital scene unit in FIG. 3 is LminTo LmaxIn the meantime.
(6) Constructing a full-link radiation regulation and control model of the infrared visual simulation system: and enabling the radiation field distribution of the exit pupil of the infrared visual simulation system to be consistent with the radiation field distribution of the real scene at the entrance pupil of the infrared imaging equipment, so as to establish a full-link radiation regulation and control model of the infrared visual simulation system. Referring to fig. 1, the exit pupil of the collimating and projecting optical system in the DMD infrared target simulator of the present invention is the exit pupil of the infrared view simulation system. Under the ideal condition, the radiation field distribution at the exit pupil of the infrared vision simulation system is consistent with the radiation field distribution of a real scene at the entrance pupil of the infrared imaging equipment under the influence of the comprehensive energy transfer efficiency and the substrate radiation, and an equality relation is established to obtain a full-link radiation regulation and control model of the system.
(7) Preparing a comparison table of radiation brightness and temperature of the black body light source: the blackbody radiation exitance M is a function related to the temperature T, and a comparison table of the blackbody radiation brightness L and the blackbody light source temperature T is established through multiple times of test calculation by utilizing the relation between the blackbody radiation exitance and the radiation brightness in a formula M-pi L.
(8) Determining parameters of a regulation model: and setting a quantization range of the image radiation brightness of the infrared digital scene unit according to the radiation brightness range in the responsivity curve of the infrared imaging equipment, calculating by using a full-link radiation regulation and control model of the infrared vision simulation system to obtain a radiation brightness value of the black body light source, and searching in a comparison table of the radiation brightness of the black body light source and the temperature of the black body light source according to the radiation brightness value of the black body light source to obtain a theoretical calculation result of the temperature of the black body light source. The theoretical result corresponds to a set quantization range of the image radiation brightness of the infrared digital scene unit, that is, one quantization range of the image radiation brightness in the infrared digital scene unit corresponds to one blackbody light source temperature.
(9) Jointly regulating and controlling the radiation field of the infrared visual simulation system: and setting the quantization range of the image radiation brightness of the infrared digital scene unit and the temperature of the black body light source by using the determined regulation and control model parameters, and vividly reproducing the infrared radiation scene on the infrared imaging and display equipment. And manually setting the image radiation brightness quantization range in the infrared digital scene unit and the black body light source temperature in the target simulator, so as to realize the combined regulation and control of the infrared visual simulation system.
The infrared visual simulation system and the radiation field joint regulation and control method thereof enable the infrared visual simulation system to reproduce the infrared radiation field distribution more vividly. Firstly, an infrared visual simulation system is constructed, an infrared digital scene unit is combined with a DMD infrared target simulator, and the relation between the radiation brightness of the infrared digital scene unit and the black body light source temperature and the transmittance of a spatial light modulator of the DMD infrared target simulator is established; according to the radiation energy transfer process of the DMD infrared target simulator, a radiation illumination transfer model at the exit pupil of the DMD infrared target simulator is established, the irradiance field at the exit pupil of the DMD infrared target simulator is consistent with the irradiance field of a real scene at the entrance pupil of the infrared imaging equipment under the influence of the comprehensive energy transfer efficiency and the substrate radiation, and therefore a full-link radiation regulation and control model of the infrared visual simulation system is established, and a regulation and control model between the radiation brightness of the black body light source and the brightness quantization range in the infrared digital scene unit is obtained. The combined regulation and control of the infrared visual simulation system is realized by regulating and controlling the temperature of the black body light source and the brightness quantization range in the infrared digital scene unit, and the projection fidelity of the infrared visual simulation system is improved.
Example 4
The infrared visual simulation system and the radiation field joint regulation and control method thereof are the same as those in the embodiments 1-3, the relationship g (x, y) between the transmittance of the spatial light modulator and the radiation brightness of the infrared digital scene unit is constructed in the step (2),
(2.1) assume normalized Gray quantization Range of [0,1 ]]The quantization range of the image radiance in the corresponding infrared digital scene unit is [ Lmin,Lmax]Then, the transmittance g (x, y) of the spatial light modulator for gray scale modulation at different positions in the infrared digital scene unit is distributed as follows:
Figure BDA0002037898260000091
L(x,y,T,θi,φi,θr,φr) The position coordinates in the infrared digital scene unit are (x, y), and the incidence direction is (theta)i,φi) The reflection direction is (theta)r,φr) T is the absolute temperature (K) of the black body, wherein LmaxAnd LminThe upper limit and the lower limit of the radiation brightness quantization range of the infrared digital scene unit.
(2.2) image radiance quantization ranges [0, L ] for different infrared digital scene unitssmax]The spatial light modulator has a transmittance g (x, y) of
Figure BDA0002037898260000092
In the formula LsmaxAnd the maximum radiation brightness value of a certain area in the infrared digital scene unit is used for determining the accurate control of the radiation brightness value of the infrared digital scene unit on the transmittance of the spatial light modulator.
Example 5
The infrared visual simulation system and the combined regulation and control method of the radiation field thereof are the same as the embodiments 1-4, the relationship between the radiation brightness of the infrared digital scene unit and the temperature of the black body light source of the DMD infrared target simulator is constructed in the step (3), in order to realize the regulation and control of the radiation brightness of the infrared digital scene unit to the temperature of the black body light source,
(3.1) establishing the relation between the radiation brightness of the infrared digital scene unit and the radiation brightness of the black body light source, wherein the image radiation brightness quantization range of the infrared digital scene unit is [ L ]min,Lmax]Time, black body light source brightness LSourceCan be set as the maximum radiance L in the infrared digital scene unitsmaxDetermined blackbody light source brightness value, i.e.
Figure BDA0002037898260000093
In the formula LSourceIs the target simulator blackbody light source brightness, Lsmax、LsminThe maximum radiance value and the minimum radiance value of a certain area in the infrared digital scene unit.
The quantization range of the image radiation brightness in the infrared digital scene unit is [0, Lsmax]The brightness of the black body light source is set as
LSource＝Lsmax
(3.2) calculating the relation between the radiation brightness of the blackbody light source and the temperature of the blackbody light source, and establishing the relation between the temperature of the blackbody light source and the output radiation brightness according to the radiometry theory, wherein the specific calculation formula is as follows:
Figure BDA0002037898260000101
in the formula
Figure BDA0002037898260000102
Is the radiation emittance of the blackbody light source,
Figure BDA0002037898260000103
is the radiation brightness of the black-body light source,
Figure BDA0002037898260000104
c1is the first radiation constant, c2Is the second radiation constant, and T is the blackbody absolute temperature (K).
(3.3) establishing a relation between the radiance of the infrared digital scene unit and the temperature of the blackbody light source: radiation brightness generated after radiation emitted by black body light source is reflected by DMD
Figure BDA0002037898260000105
Is composed of
Figure BDA0002037898260000106
Where rho2Which is the product of the transmittance of the kohler illumination path and the DMD reflectance.
Radiance produced after DMD reflection
Figure BDA0002037898260000107
The maximum brightness value of the scene radiation in the visual field of the infrared digital scene unit is regulated and controlled, namely the blackbody light source brightness L determined by the maximum scene radiation brightnessSourceEqual to the radiance reflected by the micromirror on the DMD
Figure BDA0002037898260000108
Figure BDA0002037898260000109
The quantization range of the image radiance in the infrared digital scene unit is [ L ]min,Lmax]When the temperature of the water is higher than the set temperature,
Figure BDA00020378982600001010
the quantization range of the image radiation brightness in the infrared digital scene unit is [0, Lsmax]When the temperature of the water is higher than the set temperature,
Figure BDA00020378982600001011
therefore, the regulation and control of the radiation brightness in the infrared digital scene unit on the temperature of the blackbody light source are established.
Example 6
The infrared visual simulation system and the combined regulation and control method of the radiation field thereof are the same as those in the embodiments 1 to 5, and the step (4) of constructing the radiation illumination transfer model E at the exit pupil of the DMD infrared target simulatorExit pupilAccording to the radiation energy transfer process of the DMD infrared target simulator, an initial radiation illumination transfer model at the exit pupil of the DMD infrared target simulator is established as
Figure BDA0002037898260000111
g (x, y) is the spatial light modulator transmittance distribution determined by the gray scale distribution in the infrared digital scene unit, and is normalized to [0, 1%]Determined by the dynamic A/D quantization range and the number of bits, f0Is the total focal length, τ, of the projection optics0For the total transmittance of the infrared target simulator, S (x, y) is the effective size of the target covered on the spatial light modulator, i.e., DMD device
S(x,y)＝a·b·N
Where a and b are the horizontal and vertical dimensions of the DMD pixel, respectively, and N is the number of pixels covered by the target.
Mixing L withSourceSubstitution of the relationship with g (x, y) can be obtained
Figure BDA0002037898260000112
The final model of the luminance transfer at the exit pupil is further expressed as
Figure BDA0002037898260000113
A model of blackbody light source temperature, infrared digital scene unit radiance and irradiance transfer at the exit pupil of the DMD infrared target simulator is given by the above formula. The invention determines the blackbody light source brightness L determined by the maximum radiation brightness in the infrared digital scene unitSourceMultiplying by the transmittance g (x, y) of the spatial light modulator enables the radiation of the blackbody light source to accurately reflect the radiation brightness distribution at different positions in the infrared digital scene unit.
Example 7
The infrared visual simulation system and the combined regulation and control method of the radiation field thereof are the same as those in the embodiments 1-6, and the step (6) is used for constructing the full-link radiation regulation and control model of the infrared visual simulation system, in the invention, the radiation illumination field at the exit pupil of the infrared visual simulation system, namely the radiation illumination field at the exit pupil of the DMD infrared target simulator, is consistent with the irradiance field of the real scene at the entrance pupil of the infrared imaging device under the influence of the comprehensive energy transfer efficiency and the substrate radiation, so that the radiation illumination field at the exit pupil of the infrared visual simulation system is equal to the irradiance field of the real scene at the entrance pupil of the infrared imaging device, and the full-link radiation regulation and control model of the infrared visual simulation system is established, which specifically comprises the following steps:
(6.1) when the infrared imaging device is a DC-coupled imaging, the following relation is provided:
Figure BDA0002037898260000121
in the formula LVS(x, y) is the radiance distribution of the infrared digital scene element, LRS(x, y) real scene radiance distribution, dsDMDIs the DMD pixel area, RSubstrateFor the target simulator base emissivity, TatmIs the atmospheric transmittance, fsensorIs the focal length of the detector, AdIs the area of the photosensitive surface of the detector.
L intercepted by infrared digital scene unit in normalization modeminShould be equal to the target simulator substrate radiance, i.e. satisfy
Figure BDA0002037898260000122
Can be substituted to obtain
Figure BDA0002037898260000123
Suppose that
LVS(x,y)＝LRS(x,y)
Further obtain
Figure BDA0002037898260000124
(6.2) when the infrared imaging device is AC-coupled imaging, the background DC radiation component of the system response is removed, and the following relations exist:
Figure BDA0002037898260000125
can obtain the product
Figure BDA0002037898260000126
Thus, a regulation and control model between the radiation brightness of the black body light source and the radiation brightness quantization range in the infrared digital scene unit is obtained.
In the above regulation model, some system intrinsic parameters are included, such as the area A of the photosensitive surface of the detectordFocal length f of the detectorsensorD, DMD pixel areasDMDTotal focal length f of projection optical system0. Still other parameters are obtained by experimental tests, the atmospheric transmittance TatmTotal transmittance of infrared target simulator0These parameters were obtained by experimental tests. And further including adjustable parameters, e.g. radiance quantization range [ L ] of infrared digital scene elementmin,Lmax]Radiation brightness L of black body light source in DMD infrared target simulatorSource. Obtaining the one-to-one correspondence relationship between the radiation brightness quantization range of the infrared digital scene unit and the brightness of the black body light source through a regulation modelAnd performing combined regulation and control on the system.
A more detailed example is given below, which combines the infrared view simulation system and the radiation field joint regulation method, and further describes the present invention.
Example 8
The infrared visual simulation system and the radiation field joint regulation and control method thereof are the same as the embodiments 1-7, the invention provides a radiation field joint regulation and control method of the infrared visual simulation system, and the method refers to fig. 2, and comprises the following steps:
step 1, constructing an infrared visual simulation system; the infrared visual simulation system is an infrared visual simulation system with combined regulation and control of a radiation field, an infrared digital scene generation module, an infrared target simulator and an infrared imaging and display device based on a computer are sequentially connected according to the signal transmission direction of the simulation system, the infrared digital scene generation module is sequentially connected with an infrared image input unit, a simulation scene generation unit and an infrared digital scene unit to be simulated according to the signal transmission direction, the infrared target simulator is a DMD infrared target simulator, a DMD control and drive circuit, a micro-mirror array and a collimation projection optical system are sequentially connected in the DMD infrared target simulator according to the infrared image signal processing direction, a black body light source capable of adjusting the temperature is irradiated on the micro-mirror array, the DMD control and drive circuit simultaneously carries out data bidirectional interaction with the infrared imaging and display device and the infrared digital scene unit, and the image signal frame synchronization is controlled, and the radiation field joint regulation and control of the infrared visual simulation are realized by adjusting the image brightness of the infrared digital scene unit and the black body light source temperature in the DMD infrared target simulator.
Step 2, establishing a relation between the transmittance of the spatial light modulator and the radiance of the infrared digital scene unit, namely establishing a relation between the transmittance distribution of the spatial light modulator and the radiance of the infrared digital scene unit in order to realize the accurate control of the radiance value of the infrared digital scene unit to the image generator, and specifically comprising the following steps:
(2.1) assume normalized Gray quantization Range of [0,1 ]]The quantization range of the image radiance in the corresponding infrared digital scene unit is [ Lmin,Lmax]The transmittance g (x, y) of the spatial light modulator for gray scale modulation at different positions in the infrared digital scene unit is distributed as
Figure BDA0002037898260000131
L(x,y,T,θi,φi,θr,φr) The position coordinates in the infrared digital scene unit are (x, y), and the incidence direction is (theta)i,φi) The reflection direction is (theta)r,φr) T is the absolute temperature (K) of the black body, wherein LmaxAnd LminThe upper limit and the lower limit of the radiation brightness quantization range of the infrared digital scene unit.
(2.2) image radiance quantization ranges [0, L ] for different infrared digital scene unitssmax]The spatial light modulator has a transmittance g (x, y) of
Figure BDA0002037898260000141
In the formula LsmaxAnd the maximum radiation brightness value of a certain area in the infrared digital scene unit is used for determining the accurate control of the radiation brightness value of the infrared digital scene unit on the transmittance of the spatial light modulator.
Step 3, establishing a relation between the radiation brightness of the infrared digital scene unit and the black body light source temperature of the DMD infrared target simulator, and establishing a relation between the black body light source temperature and the radiation brightness of the infrared digital scene unit in order to realize the regulation and control of the radiation brightness of the infrared digital scene unit on the black body light source temperature, which specifically comprises the following steps:
(3.1) establishing the relation between the radiation brightness of the infrared digital scene unit and the radiation brightness of the black body light source, wherein the image radiation brightness quantization range of the infrared digital scene unit is [ L ]min,Lmax]Time, black body light source brightness LSourceCan be set as the maximum radiance L in the infrared digital scene unitsmaxDetermined blackbody light source brightness
Figure BDA0002037898260000142
In the formula LSourceIs the target simulator blackbody light source brightness, Lsmax、LsminThe maximum radiance value and the minimum radiance value of a certain area in the infrared digital scene unit.
The quantization range of the image radiation brightness in the infrared digital scene unit is [0, Lsmax]When the black body light source brightness is set to
LSource＝Lsmax
(3.2) calculating control parameters required by the blackbody light source to reach the radiation brightness value, and establishing a relation between the temperature of the blackbody light source and the output radiation brightness according to a radiometric theory, wherein the specific calculation formula is as follows:
blackbody radiation emittance:
Figure BDA0002037898260000143
black body radiation brightness:
Figure BDA0002037898260000151
in the formula
Figure BDA0002037898260000152
Is the radiation emittance of the blackbody light source,
Figure BDA0002037898260000153
is the radiation brightness of the black-body light source,
Figure BDA0002037898260000154
c1is the first radiation constant, c2Is the second radiation constant, and T is the blackbody absolute temperature (K).
(3.3) radiance generated by radiation from blackbody light source after being reflected by DMD
Figure BDA0002037898260000155
Is composed of
Figure BDA0002037898260000156
Where rho2Which is the product of the transmittance of the kohler illumination path and the DMD reflectance.
Radiance produced after DMD reflection
Figure BDA0002037898260000157
The maximum brightness value of the scene radiation in the visual field of the infrared digital scene unit is regulated and controlled, namely the blackbody light source brightness L determined by the maximum scene radiation brightnessSourceEqual to the radiance reflected by the micromirror on the DMD
Figure BDA0002037898260000158
Namely, it is
Figure BDA0002037898260000159
The quantization range of the image radiance in the infrared digital scene unit is [ L ]min,Lmax]When the temperature of the water is higher than the set temperature,
Figure BDA00020378982600001510
the quantization range of the image radiation brightness in the infrared digital scene unit is [0, Lsmax]When the temperature of the water is higher than the set temperature,
Figure BDA00020378982600001511
therefore, the regulation and control of the radiation brightness in the infrared digital scene unit on the temperature of the blackbody light source are established.
Step 4, constructing a radiation illumination transfer model at the exit pupil of the DMD infrared target simulator, and enabling the tau to be in accordance with the radiation energy transfer process of the DMD infrared target simulator0The total transmittance of the DMD infrared target simulator is uniformly considered by taking the energy loss and the benefit in the process that the infrared radiation emitted by the black body light source finally reaches the exit pupil of the DMD infrared target simulator into accountThe model of the transfer of the irradiance at the exit pupil of the simulator is:
Figure BDA00020378982600001512
the geometrical relationship shows that:
Figure BDA0002037898260000161
wherein L isSourceFor blackbody source radiance, g (x, y) is the spatial light modulator transmittance distribution determined by the gray scale distribution in the infrared digital scene unit, normalized to [0, 1%]And the dynamic quantization range and the number of bits are determined by the A/D dynamic quantization range. f. of0Is the total focal length of the projection optical system, r is the exit pupil radius of the projection optical system, theta is the object half-aperture angle corresponding to the DMD pixel, and S (x, y) is the effective size of the target covered on the spatial light modulator, i.e. the DMD device
S(x,y)＝a·b·N
Where a and b are horizontal and vertical dimensions of the DMD pixel, respectively, and N is the number of pixels covered by the target. Since θ is small, tan θ is considered to be sin θ, and the substitution can be given as:
Figure BDA0002037898260000162
mixing L withSourceSubstituting g (x, y) into the formula
Figure BDA0002037898260000163
The final model of the luminance transfer at the exit pupil is further expressed as
Figure BDA0002037898260000164
A model of blackbody light source temperature, infrared digital scene unit radiance and irradiance transfer at the exit pupil of the DMD infrared target simulator is given by the above formula. The invention determines the black body of the maximum radiation brightness in the infrared digital scene unitLight source brightness LSourceMultiplying by the transmittance g (x, y) of the spatial light modulator enables the radiation of the blackbody light source to accurately reflect the radiation brightness distribution at different positions in the infrared digital scene unit.
And 5, determining the image radiation brightness quantization range of the infrared digital scene unit participating in the joint regulation and control and the range of the black body light source temperature, taking a signal transfer function and a corresponding response dynamic range (S-shaped curve) of the infrared imaging system static performance test as standards, and taking the saturation temperature of the S-shaped curve as a basis for setting the black body temperature. Assuming a saturation temperature of TmaxThen the equivalent black body temperature at the exit pupil of the vision simulation system can be set to Tmax+2NETD, and determining the equivalent blackbody temperature K (T) according to the target simulator radiant energy transfer test calibrationmax+2NETD)。
The maximum value of the quantization range of the radiance in the infrared digital scene unit is TmaxThe maximum brightness and the minimum value of the quantization range corresponding to +2NETD are also responded by the infrared imaging equipment to the minimum value T of the transfer function curvemin-2NETD determined minimum brightness.
Step 6, constructing an infrared view simulation system full link radiation regulation model, wherein an irradiance field at an exit pupil of the infrared view simulation system, namely a radiation illuminance field at the exit pupil of the DMD infrared target simulator is consistent with an irradiance field of a real scene at an entrance pupil of the infrared imaging equipment, under the influence of the comprehensive energy transfer efficiency and the substrate radiation,
(6.1) when the infrared imaging device is a direct current coupling imaging device, the responsivity curve is as shown in FIG. 3, and the following relationship exists:
Figure BDA0002037898260000171
in the formula LVS(x, y) is the radiance distribution of the infrared digital scene element, LRS(x, y) real scene radiance distribution, dsDMDIs the DMD pixel area, RSubstrateFor the target simulator base emissivity, TatmIs the atmospheric transmittance, fsensorIs the focal length of the detector, AdIs the area of the photosensitive surface of the detector.
L intercepted by infrared digital scene unit in normalization modeminShould be equal to the target simulator substrate radiance, i.e. satisfy
Figure BDA0002037898260000172
Can be substituted to obtain
Figure BDA0002037898260000173
Suppose that
LVS(x,y)＝LRS(x,y)
Can further obtain
Figure BDA0002037898260000174
Figure BDA0002037898260000175
(6.2) when the infrared imaging device is AC-coupled imaging, the DC radiation component of the response is removed, and the responsivity curve of the AC-coupled imaging device is shown in FIG. 4 and has the following relationship:
Figure BDA0002037898260000181
suppose that
LVS(x,y)＝LRS(x,y)
Can further obtain
Figure BDA0002037898260000182
Therefore, a regulation model between the radiation brightness of the black body light source and the radiation brightness quantization range in the infrared digital scene unit can be determined.
And 7, making a comparison table of the radiation brightness of the black body light source and the temperature of the black body light source, wherein the blackbody radiation exitance M is a function related to the temperature T, establishing a relationship between the radiation brightness L of the black body light source and the temperature T by utilizing the relationship between the radiation exitance M of the black body and the radiation brightness L in the formula M-pi L, and establishing the comparison table of the radiation brightness of the black body light source and the temperature of the black body light source through multiple calculations.
Step 8, determining parameters of a regulation model: and setting a quantization range of the image radiation brightness of the infrared digital scene unit according to the radiation brightness range in the responsivity curve of the infrared imaging equipment, calculating by using a full-link radiation regulation and control model of the infrared vision simulation system to obtain a radiation brightness value of the black body light source, and searching in a comparison table of the radiation brightness of the black body light source and the temperature of the black body light source according to the radiation brightness value of the black body light source to obtain a theoretical calculation result of the temperature of the black body light source. The theoretical result corresponds to a set quantization range of the image radiation brightness of the infrared digital scene unit, that is, one quantization range of the image radiation brightness in the infrared digital scene unit corresponds to one blackbody light source temperature.
And 9, jointly regulating and controlling the radiation field of the infrared visual simulation system, arranging an image radiation brightness quantization range regulating window in the infrared digital scene unit, manually setting the image radiation brightness quantization range of the infrared digital scene unit, setting a temperature parameter setting button on a black body light source in the DMD infrared target simulator, determining the temperature of the black body light source corresponding to the image radiation brightness quantization range in the infrared digital scene unit according to the established infrared visual simulation system full-link radiation regulation and control model, setting the temperature of the black body light source, and acquiring and displaying a projection result at the exit pupil of the infrared visual simulation system by the infrared imaging equipment to vividly reproduce the infrared radiation field.
The invention considers the infrared visual simulation system as a whole, combines the infrared digital scene unit and the DMD infrared target simulator, and realizes the joint regulation and control of the infrared visual simulation system. The method is simple to operate and easy to regulate, and can reproduce the infrared radiation image with higher fidelity.
In summary, the infrared view simulation system and the radiation field joint regulation and control method thereof disclosed by the invention solve the joint regulation and control problem of the infrared digital scene unit and the DMD infrared target simulator. The DMD control and drive circuit in the infrared visual simulation system simultaneously performs data bidirectional interaction with the infrared imaging and display equipment and the infrared digital scene unit, and controls the frame synchronization of image signals. The combined regulation and control of the infrared visual simulation system are realized by adjusting the image radiation brightness of the infrared digital scene unit and the temperature of a black body light source in the DMD infrared target simulator. The invention relates to a radiation field joint regulation and control method, which is characterized in that on the basis of an infrared vision simulation system, the relation between the radiation brightness of an infrared digital scene unit and the blackbody light source temperature and the transmittance of a DMD infrared target simulator is established item by item, a radiation illumination transfer model at the exit pupil of the DMD infrared target simulator is established, the image radiation brightness quantization range and the blackbody light source temperature range of the infrared digital scene unit participating in joint regulation and control are determined, a full-link radiation regulation and control model of the infrared vision simulation system is established, a blackbody light source radiation brightness and temperature comparison table is manufactured and searched, and the parameters of the regulation and control model are determined, so that the joint regulation and control of the radiation field of the infrared vision simulation system is realized and the infrared vision.

Claims (5)

1. A radiation field joint regulation and control method of an infrared visual simulation system is characterized by comprising the following steps:
(1) constructing an infrared visual simulation system; the infrared visual simulation system is an infrared visual simulation system with combined regulation and control of a radiation field, and is sequentially connected with a computer-based infrared digital scene generation module, a DMD infrared target simulator and an infrared imaging and display device according to the signal transmission direction of the simulation system; the infrared digital scene generation module is sequentially connected with an infrared image input unit to be simulated, a simulation scene generation unit and an infrared digital scene unit according to a signal transmission direction, a DMD control and drive circuit, a micro-mirror array and a collimation projection optical system are sequentially connected in the DMD infrared target simulator according to an infrared image signal processing direction, a black body light source capable of adjusting temperature is irradiated on the micro-mirror array, the DMD control and drive circuit is simultaneously in data bidirectional interaction with the infrared imaging and display equipment and the infrared digital scene unit, and controls image signal frame synchronization, and combined regulation and control of a radiation field of the infrared visual scene simulation system are realized by adjusting the image radiation brightness of the infrared digital scene unit and the black body light source temperature in the DMD infrared target simulator;
(2) constructing a relation g (x, y) between the transmittance of the spatial light modulator and the radiance of an infrared digital scene unit: defining the transmittance of the spatial light modulator as a normalization result of gray level modulation on the radiation brightness at different positions in the infrared digital scene unit, carrying out gray level modulation on the images at different positions in the infrared digital scene unit within the image radiation brightness quantization range of the infrared digital scene unit to obtain image radiation brightness values at different positions, and establishing a relationship between the transmittance of the spatial light modulator and the radiation brightness of the infrared digital scene unit as a basis for regulating and controlling the transmittance of the spatial light modulator by the radiation brightness of the infrared digital scene unit;
(3) constructing a relation between the radiance of the infrared digital scene unit and the temperature of the black body light source of the DMD infrared target simulator: establishing a relation between the temperature of the black body light source and the image radiation brightness of the infrared digital scene unit to obtain the temperature of the black body light source corresponding to the maximum radiation brightness of the image in the infrared digital scene unit, wherein the temperature of the black body light source is used as a basis for regulating and controlling the temperature of the black body light source by the radiation brightness of the infrared digital scene unit;
(4) building a radiation illumination transfer model E at the exit pupil of the DMD infrared target simulatorExit pupil: establishing a radiation illumination transfer model at the exit pupil of a collimating and projecting optical system of the DMD infrared target simulator, and obtaining a transfer model of the radiation illumination of the black body light source temperature and the infrared digital scene unit and the radiation illumination at the exit pupil by utilizing the relation between the radiation brightness of the infrared digital scene unit, the black body light source temperature of the DMD infrared target simulator and the transmittance of the spatial light modulator;
(5) determining the image radiation brightness quantization range and the black body light source temperature range of the infrared digital scene unit participating in the joint regulation: setting the temperature of a black body light source and the image radiation brightness quantization range of an infrared digital scene unit according to a signal transfer function of the static performance test of the infrared imaging and display equipment and a corresponding response dynamic range, wherein in the setting, the image radiation brightness quantization range of the infrared digital scene unit is consistent with the dynamic response range of the infrared imaging and display equipment and the image radiation brightness quantization scale of the infrared imaging and display equipment;
(6) constructing a full-link radiation regulation and control model of the infrared visual simulation system: enabling the distribution of the radiation field at the exit pupil of the infrared visual simulation system to be consistent with that of a real scene at the entrance pupil of the infrared imaging and display equipment, and establishing a full-link radiation regulation and control model of the infrared visual simulation system;
(7) preparing a comparison table of radiation brightness and temperature of the black body light source: the radiation exitance M of the blackbody light source is a function related to the temperature T, a comparison table of the radiation brightness of the blackbody light source and the temperature of the blackbody light source is established through multiple times of calculation by utilizing the relation between the radiation exitance of the blackbody light source and the radiation brightness in a formula M-pi L, and L is the radiation brightness;
(8) determining parameters of a regulation model: according to the quantization range of the image radiation brightness of the set infrared digital scene unit, calculating by using a full-link radiation regulation and control model of the infrared vision simulation system to obtain a black body light source radiation brightness value, searching a comparison table of the black body light source radiation brightness and the black body light source temperature to obtain a theoretical calculation result of the black body light source temperature;
(9) jointly regulating and controlling the radiation field of the infrared visual simulation system: and setting the quantization range of the image radiation brightness of the infrared digital scene unit and the temperature of the black body light source by using the determined regulation and control model parameters, and vividly reproducing the infrared radiation scene on the infrared imaging and display equipment.
2. The method for jointly regulating and controlling the radiation field of an infrared vision simulation system according to claim 1, wherein the step (2) of constructing the relationship g (x, y) between the transmittance of the spatial light modulator and the radiation brightness of the infrared digital scene unit comprises the following steps:
(2.1) assume normalized Gray quantization Range of [0,1 ]]The quantization range of the image radiance in the corresponding infrared digital scene unit is [ Lmin,Lmax]Then, the transmittance g (x, y) of the spatial light modulator for gray scale modulation at different positions in the infrared digital scene unit is distributed as follows:
Figure FDA0002584073640000021
L(x,y,T,θi,φi,θr,φr) The position coordinates in the infrared digital scene unit are (x, y), and the incidence direction is (theta)i,φi) The reflection direction is (theta)r,φr) T is the absolute temperature of the black body, wherein LmaxAnd LminThe upper limit and the lower limit of the radiation brightness quantization range of the infrared digital scene unit are defined;
(2.2) image radiance quantization ranges [0, L ] for different infrared digital scene unitssmax]The spatial light modulator has a transmittance g (x, y) of
Figure FDA0002584073640000031
In the formula LsmaxAnd determining the maximum radiance value of a certain area in the infrared digital scene unit so as to accurately control the transmittance of the spatial light modulator by the radiance value of the infrared digital scene unit.
3. The combined regulation and control method for the radiation field of the infrared vision simulation system according to claim 2, characterized in that the establishment of the relationship between the radiation brightness of the infrared digital scene unit and the black body light source temperature of the DMD infrared target simulator in step (3) comprises the following steps:
(3.1) establishing the relation between the radiation brightness of the infrared digital scene unit and the radiation brightness of the black body light source, wherein the image radiation brightness quantization range of the infrared digital scene unit is [ L ]min,Lmax]The radiation brightness of the blackbody light source can be set to be determined by the maximum radiation brightness in the infrared digital scene unit
Figure FDA0002584073640000032
In the formula LSourceRadiation brightness L of black body light source of DMD infrared target simulatorsmax、LsminThe maximum radiance value and the minimum radiance value of a certain area in the infrared digital scene unit are obtained;
the quantization range of the image radiation brightness in the infrared digital scene unit is [0, Lsmax]At the same time, the radiation brightness of the black body light source is set to
LSource＝Lsmax
(3.2) calculating to obtain the relation between the radiation brightness value of the black body light source and the temperature of the black body light source, and establishing the relation between the temperature of the black body light source and the output radiation brightness according to the radiometry theory, wherein the specific calculation formula is as follows:
Figure FDA0002584073640000033
in the formula
Figure FDA0002584073640000034
Is a wavelength lambda1～λ2The radiation emittance of the black body light source in between,
Figure FDA0002584073640000035
is a wavelength lambda1～λ2Black body light source radiance between, F (λ)1T) is a wavelength of λ1Temperature is the black body radiation function of T, F (lambda)2T) is a wavelength of λ2The temperature is the blackbody radiation function of T,
Figure FDA0002584073640000041
c1is the first radiation constant, c2Is the second radiation constant, T is the blackbody absolute temperature;
(3.3) establishing a relation between the radiance of the infrared digital scene unit and the temperature of the blackbody light source: the radiant brightness generated after the radiant brightness emitted by the black body light source is reflected by the DMD infrared target simulator
Figure FDA0002584073640000042
Is composed of
Figure FDA0002584073640000043
Where rho2The product of the transmittance of the Kohler illumination light path and the reflectivity of the DMD infrared target simulator;
radiance reflected by a micromirror on a DMD infrared target simulator
Figure FDA0002584073640000044
The maximum brightness value of the scene radiation in the visual field of the infrared digital scene unit is regulated, namely the radiation brightness L of the blackbody light source determined by the maximum scene radiation brightnessSourceEqual to the radiance reflected by a micro-mirror on a DMD infrared target simulator
Figure FDA0002584073640000045
Namely, it is
Figure FDA0002584073640000046
The quantization range of the image radiance in the infrared digital scene unit is [ L ]min,Lmax]When the temperature of the water is higher than the set temperature,
Figure FDA0002584073640000047
the quantization range of the image radiation brightness in the infrared digital scene unit is [0, Lsmax]When the temperature of the water is higher than the set temperature,
Figure FDA0002584073640000048
therefore, the regulation and control of the radiation brightness in the infrared digital scene unit on the temperature of the blackbody light source are established.
4. The method for jointly regulating and controlling the radiation field of the infrared vision simulation system according to claim 3, wherein the step (4) is performed by constructing a radiation illumination transfer model E at the exit pupil of the DMD infrared target simulatorExit pupilAccording to the radiation energy transfer process of the DMD infrared target simulator, an initial radiation illumination transfer model at the exit pupil of the DMD infrared target simulator is established as
Figure FDA0002584073640000051
g (x, y) is the spatial light modulator transmittance distribution determined by the gray scale distribution in the infrared digital scene unit, and is normalized to [0, 1%]Determined by the dynamic A/D quantization range and the number of bits, f0Is the total focal length, τ, of the projection optics0For the total transmittance of the DMD infrared target simulator, S (x, y) is the effective size of the target covered on the spatial light modulator, i.e., the DMD infrared target simulator
S(x,y)＝a·b·N
In the formula, a and b are respectively the horizontal and vertical sizes of pixels of the DMD infrared target simulator, and N is the number of pixels covered by a target;
mixing L withSourceSubstituted with g (x, y) to give
Figure FDA0002584073640000052
The final exit pupil radiance transfer model is further expressed as
Figure FDA0002584073640000053
A model for transferring the radiation brightness of the black body light source temperature, the infrared digital scene unit and the radiation illumination at the exit pupil of the DMD infrared target simulator is given by the formula.
5. The method according to claim 4, wherein the step (6) is implemented by constructing a full-link radiation control model of the IR vision simulation system, wherein the radiation illumination field at the exit pupil of the IR vision simulation system, i.e. the radiation illumination field at the exit pupil of the DMD IR target simulator, is consistent with the radiation illumination field of the real scene at the entrance pupil of the IR imaging and display device under the influence of the integrated energy transfer efficiency and substrate radiation,
(6.1) when the infrared imaging and display device is DC-coupled imaging, the following relation is provided:
Figure FDA0002584073640000054
in the formula LVS(x, y) is the radiance distribution of the infrared digital scene element, LRS(x, y) real scene radiance distribution, dsDMDIs the pixel area, R, of the DMD infrared target simulatorSubstrateFor the target simulator base emissivity, TatmIs the atmospheric transmittance, fsensorIs the focal length of the detector, AdIs the area of the photosensitive surface of the detector;
l intercepted by infrared digital scene unit in normalization modeminShould equal the DMD target simulator substrate radiance, i.e. meet
Figure FDA0002584073640000061
Can be substituted to obtain
Figure FDA0002584073640000062
Suppose that
LVS(x,y)＝LRS(x,y)
Further obtain
Figure FDA0002584073640000063
(6.2) when the infrared imaging and display device is AC-coupled imaging, the background DC radiation component of the system response is removed, and the following relations exist:
Figure FDA0002584073640000064
can obtain the product
Figure FDA0002584073640000065
And obtaining a regulation and control model between the radiation brightness of the black body light source and the radiation brightness quantization range in the infrared digital scene unit.
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