Infrared projection simulator

Abstract

The invention discloses an infrared projection simulator. The infrared projection simulator comprises at least two dimming modules, a condensation module, a micro-radiation array and an infrared window. Wherein each dimming module comprises a spatial light modulator and an illumination unit, the illumination unit emits an illumination light beam to the spatial light modulator, the spatial light modulator is used for modulating the illumination light beam to obtain a structured light signal, and the structured light signals generated after modulation of the spatial light modulator in each dimming module have the same modulation information. The light gathering module is used for gathering the structured light signals generated by all the dimming modules and generating structured light gathering light beams. And the micro-radiation array receives the structured light convergence light beam and generates an infrared simulation image. The infrared simulation image is emitted through the infrared window. According to the infrared projection simulator, through cooperation of the at least two dimming modules and the condensation module, long-time stable and high-contrast infrared simulation is provided while the total system energy is improved.

Description

Technical Field

[0001] The present application relates to the field of infrared simulation testing technology, and in particular to an infrared projection simulator. Background Art

[0002] With the rapid development of infrared imaging detection systems, how to quickly and accurately evaluate the performance parameters of the system has become more important. With the infrared dynamic target simulator as the core, a semi-physical simulation system is built to simulate a real and controllable external environment. Testing the infrared system in the laboratory can reduce the test cycle and cost. Improving the performance of the simulator can improve the stability and accuracy of the test results, so the demand for infrared projection simulation technology is getting higher and higher.

[0003] At present, infrared projection simulation technology can be divided into three types according to different principles. The first is to study how to perform spatial modulation of light through the physical movement of the reflective surface. The second is to study how to generate thermal radiation and modulate the radiated infrared light by modulating the position of thermal radiation. The third is to study how to absorb the energy of visible light and convert it into thermal energy to radiate infrared light, and realize an infrared image consistent with the visible light projection image on the array. For the third infrared projection simulation method, the excitation source mainly emits a light beam to the modulator, and the modulator modulates the light beam and emits it to the micro-radiation array, so that the micro-radiation array heats up and radiates infrared light. Infrared light is mainly generated by the thermal radiation of an object. The higher the temperature, the greater the thermal radiation energy. The radiated infrared light is absorbed by the infrared detector after spatial propagation and converted into thermal energy. After signal processing, the infrared image is output.

[0004] In the related technology, the light energy absorbed by the micro-radiation array can be increased by increasing the light source energy of the excitation source, thereby increasing the pixel temperature and temperature difference range of the micro-radiation array, thereby improving the contrast of the infrared simulation image and improving the imaging quality of the infrared simulation technology. However, due to the increase in the light source energy of the excitation source, the energy irradiated on the modulator per unit time is too large, and the modulator heats up too quickly, causing the system to overheat, resulting in the inability to provide long-term simulation.

[0005] Therefore, it is necessary to provide a technical solution that provides long-term stable, high-contrast infrared simulation. Summary of the invention

[0006] The object of the present invention is to provide an infrared projection simulator which can provide long-term stable and high-contrast infrared simulation.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] Infrared projection simulator includes:

[0009] At least two dimming modules, the dimming modules include a spatial light modulator and an illumination unit, the illumination unit emits an illumination beam to the spatial light modulator, the spatial light modulator is used to modulate the illumination beam to obtain a structured light signal, and the structured light signals generated by the spatial light modulators in each dimming module after modulation have the same modulation information;

[0010] A focusing module, which is used to focus the structured light signals generated by each dimming module to generate a structured light focused beam;

[0011] A micro-radiation array receives a structured light convergence beam and generates an infrared simulation image;

[0012] Infrared window, the infrared simulation image is emitted through the infrared window.

[0013] Furthermore, in the dimming module, the lighting unit uses a laser, and the laser wavelengths emitted by each laser are different, and the difference in the laser wavelengths emitted by each laser is greater than 20 nm.

[0014] Furthermore, the dimming module also includes a light homogenizing unit, which is used for homogenizing light. The illumination light beam emitted by the illumination unit passes through the light homogenizing unit and then irradiates the spatial light modulator.

[0015] Furthermore, the dimming module further includes a collimating unit, which is disposed on an optical path between the spatial light modulator and the focusing module to collimate the structured light signal emitted by the spatial light modulator and then emit it to the focusing module.

[0016] Furthermore, the focusing module includes parallel plates corresponding to the number of dimming modules, and each parallel plate is used to respectively reflect the structured light signal emitted by one dimming module to adjust the optical path of the structured light signal emitted by each dimming module so that the adjusted optical paths of the structured light signals emitted by each dimming module are the same;

[0017] The reflective surface of each parallel plate is coated with a total reflective film to achieve maximum reflectivity of any parallel plate at the laser wavelength of the corresponding dimming module.

[0018] Furthermore, the parallel plates are arranged along the optical path direction of the structured light signal after adjustment, and the front structured light signal converges with the rear structured light signal into a concentric light beam after passing through the parallel plates;

[0019] The side of the parallel plate opposite to the reflective surface is coated with at least one layer of anti-reflection film to increase the transmittance of the front structured light signal.

[0020] Furthermore, the infrared projection simulator also includes a filter module, which is arranged on the optical path between the focusing module and the micro-radiation array, and is used to filter out stray light in the structured light convergence beam.

[0021] Furthermore, the infrared projection simulator also includes a temperature control module, and the temperature control module is used to adjust the temperature of the micro-radiation array.

[0022] Furthermore, the temperature control module adopts a Peltier cooling sheet.

[0023] Furthermore, the infrared projection simulator also includes a light trap module, and the light trap module is used to receive the light beam reflected by the spatial light modulator when the spatial light modulator is in a non-working state.

[0024] The infrared projection simulator of the present application cooperates with at least two dimming modules and a focusing module to increase the total system energy while reducing the energy irradiated on the dimming module per unit time, thereby providing long-term stable, high-contrast infrared simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of an infrared projection simulator provided in the first embodiment of the present application.

[0026] Figure 2 A schematic diagram of the structure of a dimming module provided in an embodiment of the present application.

[0027] Figure 3 A schematic diagram of the structure of an infrared projection simulator provided in the second embodiment of the present application.

[0028] Figure 4 A schematic diagram of the structure of an infrared projection simulator provided in the third embodiment of the present application.

[0029] Figure 5 This is a schematic diagram of the structure of a single-channel dimming module and a focusing module provided in an embodiment of the present application.

[0030] Figure 6 This is a schematic diagram of the structure of a dimming module and a focusing module for combining four laser beams provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The present application will be described in detail below in conjunction with the specific implementation modes shown in the accompanying drawings, but these implementation modes do not limit the present application. Structural, methodological, or functional changes made by ordinary technicians in the field based on these implementation modes are included in the protection scope of the present application.

[0032] like Figure 1As shown, an infrared projection simulator 100 includes at least two dimming modules 11, a focusing module 12, a micro-radiation array 13 and an infrared window 14. The dimming module 11 includes a spatial light modulator 111 and an illumination unit 112. The illumination unit 112 emits an illumination beam to the spatial light modulator 111. The spatial light modulator 111 is used to modulate the illumination beam to obtain a structured light signal. The structured light signals generated by the spatial light modulator 111 in each dimming module 11 have the same modulation information. The focusing module 12 is used to converge the structured light signals generated by each dimming module 11 to generate a structured light converged beam. The micro-radiation array 13 receives the structured light converged beam to generate an infrared simulation image. The infrared simulation image is emitted through the infrared window 14.

[0033] Specifically, the micro-radiation array 13 includes a substrate for receiving light beams and a plurality of micro-radiation elements. For a single micro-radiation element, the heat exchange mode of the environment is heat conduction and radiation. According to the two energy exchange modes, the energy exchange state of a single micro-radiation element can be calculated. Among them, heat conduction is the heat transfer between the micro-radiation element and the substrate through heat conduction, according to the following heat transfer formula:

[0034]

[0035] Where q″ is the heat conduction density, the unit is w / m 2 k is the thermal conductivity, the unit is w / mK. dT / dx is the temperature gradient, the unit is k / m.

[0036] The heat transfer between the micro-radiation element and the substrate can be expressed by the following formula (2):

[0037]

[0038] Where q' is the power transferred in w, and A is the conduction area in m 2 , k represents thermal conductivity, and dT / dx represents temperature gradient.

[0039] Since the temperature of the micro-radiation pixel itself is relatively high, the heat exchange between the micro-radiation pixel and the environment also includes radiation. The heat flux density of the heat exchange between the micro-radiation pixel and the environment can be expressed by the following formula (3):

[0040]

[0041] Where ε is the micro-radiation element emissivity, α is the micro-radiation pixel absorptivity, E b represents the radiation emittance, G is the irradiance projected from the environment to the micro-radiation element, T s With T h are the temperatures of the microradiation pixel and the environment, respectively, and σ is the Stefan-Boltzmann constant.

[0042] When the energy received by each micro-radiation element is greater than the energy lost by heat, the micro-radiation element can be heated up, thereby increasing the temperature of the micro-radiation array 113 and forming an infrared image.

[0043] At the same time, according to formula (4) and formula (5), the greater the radiation intensity received by the object, the higher the temperature.

[0044]

[0045] M b =εσT 4 (5)

[0046] Where: E is the irradiance, Φ is the radiation flux, s is the radiation area, M b is the radiation emittance, ε is the emissivity, σ is the Stefan-Boltzmann constant, and T is the thermodynamic temperature.

[0047] Since infrared light is mainly generated by the thermal radiation of objects, the higher the temperature, the greater the thermal radiation energy. The radiated infrared light propagates through space and is absorbed by the infrared detector, converted into heat energy or electrical energy, and outputs an infrared image after signal processing. Therefore, the key to achieving passive infrared projection is to make the material absorb as much visible light energy as possible to raise the temperature sufficiently. As an optional implementation method, the infrared projection simulator can be vacuum packaged as a whole to avoid the influence of air convection on the uniformity of the infrared projection simulator.

[0048] The infrared projection simulator 100 of the present application adopts multiple adjustment modules 11 including lighting units 112. The light energy emitted by the multiple adjustment modules 11 is converged through the focusing module 12 to illuminate the micro-radiation array 13, thereby improving the micro-radiation array 13 to absorb visible light energy, so that the micro-radiation array 13 absorbs as much visible light energy as possible to increase the temperature sufficiently, thereby improving the contrast of the infrared simulation image emitted by the micro-radiation array 13, thereby improving the imaging quality of the infrared projection simulator 100.

[0049] In addition, since multiple dimming modules 11 are used, while meeting the light source energy intensity required by the infrared projection simulator 100, the intensity of the illumination light beam emitted by a single dimming module 11 per unit time can be reduced, that is, the light intensity irradiated on the spatial light modulator 111 by the illumination unit 112 in a single dimming module 11 per unit time is reduced, thereby avoiding overheating of the single dimming module 11 due to rapid heating of the spatial light modulator 111, thereby extending the working time of the dimming module 11 and thereby improving the working time of the infrared projection simulator 100.

[0050] In summary, the infrared projection simulator 100 of the present application cooperates with at least two dimming modules 11 and a focusing module 12 to increase the total system energy while reducing the energy irradiated on the dimming module 11 per unit time, thereby providing long-term stable, high-contrast infrared simulation.

[0051] As an optional implementation, in the embodiment of the present application, the spatial light modulator 111 uses a DMD (digital micromirror array chip, Digital Micromirror Device, DMD). Based on the high resolution of the DMD, the accuracy of modulating the illumination beam can be improved to obtain a high-contrast structured light signal to improve the infrared projection simulation imaging effect. In addition, the use of DMD in the spatial light modulator 111 can also reduce the energy consumption of the spatial light modulator 111 and increase the service life of the spatial light modulator 111.

[0052] As an optional implementation, the lighting unit 112 in each dimming module 11 uses a laser.

[0053] Specifically, the use of a high-power semiconductor laser as the lighting unit 121 in the embodiment of the present application can get rid of the defect of low power of the traditional light source in the visible light range, can radiate high energy, and thus can improve the temperature difference of a single radiating pixel in the micro-radiation array, effectively improving the system contrast. In addition, the use of a laser in the lighting unit 112 can enable the lighting unit 112 to provide an illumination beam with a narrow wavelength range, avoid the influence and crosstalk of a beam with a wide wavelength range on the micro-radiation array 13, and improve the stability of the operation of the micro-radiation array 13.

[0054] like Figure 2 As shown, as an optional implementation, the dimming module 11 further includes a light homogenizing unit 113 , which is used for homogenizing light. The illumination light beam emitted by the illumination unit 112 passes through the light homogenizing unit 113 and then irradiates the spatial light modulator 111 .

[0055] Specifically, the light homogenizing unit 113 is arranged on the optical path between the lighting unit 112 and the spatial light modulator 111. The light homogenizing unit 113 can be a single lens or a plurality of lenses superimposed. In the present application, the light homogenizing unit 113 is composed of three lenses arranged in sequence and used as a whole. The three lenses are arranged on the same optical axis. Through the above arrangement, the illumination light beam emitted by the lighting unit 112 can be evenly projected onto the light modulator 111, so that the energy generated by the lighting unit 112 is more uniform.

[0056] As an optional implementation, the dimming module 11 also includes a collimating unit 114, which is arranged on the optical path between the spatial light modulator 111 and the focusing module 12 to collimate the structured light signal emitted by the spatial light modulator 111 and then emit it to the focusing module 12. The collimating unit 114 can be a group of collimating lenses, which are similar to convex lenses. In an embodiment of the present invention, the collimating unit 114 is composed of four lenses arranged in sequence and used as a whole, and the four lenses are arranged on the same optical axis. Through the above arrangement, the collimating unit 114 collimates the structured light signal emitted by the light modulator 111 and then emits it in parallel to the focusing module 12.

[0057] In the operation of the dimming module 11 of the present application, the lighting unit 112 uses a laser to emit an illumination beam, and the illumination beam is evenly projected onto the light modulator 111 through the light homogenization unit 113. The spatial light modulator 111 modulates the illumination beam to generate a structured light signal, and the structured light signal is projected to the focusing module 12 through the collimation unit 114, and the dimming module 11 completes its operation.

[0058] like Figure 3 As shown, the number of dimming modules 11 can be set according to actual conditions to improve the applicability of the infrared projection simulator 100. In the embodiment of the present application, four dimming modules 11 are used, namely, a first dimming module 11a, a second dimming module 11b, a third dimming module 11c and a fourth dimming module 11d. The first dimming module 11a includes a first lighting unit 112a, the second dimming module 11b includes a second lighting unit 112b, the third dimming module 11c includes a third lighting unit 112c, and the fourth dimming module 11d includes a fourth lighting unit 112d.

[0059] As an optional implementation, the focusing module 12 includes parallel plates 121 corresponding to the number of dimming modules 11, and each parallel plate 121 is used to reflect the structured light signal emitted by a dimming module 11, so as to adjust the optical path of the structured light signal emitted by each dimming module 11, so that the adjusted optical paths of the structured light signals emitted by each dimming module 11 are the same, and the reflective surface of each parallel plate 121 is coated with a total reflection film, so as to achieve the maximum reflectivity of any parallel plate 121 at the laser wavelength of the corresponding dimming module 11. Among them, the adjustment module that sends the incident structured light signal to the parallel plate 121 is the parallel plate 121 corresponding to the dimming module 11.

[0060] As an optional implementation method, the laser wavelengths emitted by each laser are different, and the difference in the laser wavelengths emitted by each laser is greater than 20nm, which can ensure that the laser will not be reflected by the total reflective coating on the reflective surface of the parallel plate when passing through the back of the parallel plate, thereby ensuring that the laser emitted by each laser can pass through the back of the parallel plate and converge into a concentric light beam with the other lasers.

[0061] As an optional implementation method, the wavelength of the laser emitted by the laser is within the visible light range. For the sake of convenience, the wavelength range of the laser in each dimming module is exemplarily shown in the embodiment of the present application, as follows: the first lighting unit 112a adopts a laser 1 with a wavelength of 450±5nm and an adjustable power range of 1mW~300W; the second lighting unit 112b adopts a laser 2 with a wavelength of 520±5nm and a power range of 1mW~300W; the third lighting unit 112c adopts a laser 3 with a wavelength of 690±5nm and a power range of 1mW~300W; the fourth lighting unit 112d adopts a laser 4 with a wavelength of 760±5nm and a power range of 1mW~300W. The four dimming modules 11 generate structured light signals, and the structured light convergence beam is obtained by the focusing module 12.

[0062] Correspondingly, each parallel plate is coated with a total reflection coating with different reflection parameters, so as to achieve the maximum reflectivity of the parallel plate at the laser wavelength of the corresponding dimming module. Specifically, the focusing module 12 in the embodiment of the present application includes a first parallel plate 121a, a second parallel plate 121b, a third parallel plate 121c and a fourth parallel plate 121d. Among them, the first parallel plate 121a corresponds to the first dimming module 11a to adjust the optical path of the structured light signal emitted by the first dimming module 11a, corresponding to the laser wavelength emitted by the first lighting unit. In the embodiment of the present application, the reflective surface of the first parallel plate 121a is coated with a total reflection film with a wavelength range of 450±5nm and a reflectivity greater than 99%, so as to improve the utilization rate of the structured light signal.

[0063] Similarly, the second parallel plate 121b corresponds to the second dimming module 11b, and the reflective surface of the second parallel plate 121b is coated with a total reflection film with a wavelength range of 520±5nm and a reflectivity greater than 99%. The third parallel plate 121c corresponds to the third dimming module 11c, and the reflective surface of the third parallel plate 121c is coated with a total reflection film with a wavelength range of 690±5nm and a reflectivity greater than 99%. The fourth parallel plate 121d corresponds to the fourth dimming module 11d, and the reflective surface of the fourth parallel plate 121b is coated with a total reflection film with a wavelength range of 760±5nm and a reflectivity greater than 99%. Through the above settings, the first parallel plate 121a, the second parallel plate 121b, the third parallel plate 121c and the fourth parallel plate 121d can reflect the structured light signal emitted by the corresponding adjustment module 11 with maximum efficiency to improve the utilization rate of the structured light signal. By adjusting the positions of the focusing module 12 and the dimming module 11, the structured light signals reflected by the first parallel plate 121a, the second parallel plate 121b, the third parallel plate 121c and the fourth parallel plate 121d have the same optical path, which facilitates the convergence of the structured light signals.

[0064] As an optional implementation method, the parallel plates 121 are arranged along the direction of the optical path 101 after the structured light signal is adjusted. After the front structured light signal passes through the parallel plates 121, it converges with the rear structured light signal into a concentric light beam; the side of the parallel plates 121 opposite to the reflective surface is coated with at least one layer of anti-reflection film to increase the transmittance of the front structured light signal.

[0065] It should be noted that, in the embodiment of the present application, the front structured light signal and the rear structured light signal are relative to the parallel plate. In the embodiment of the present application, the structured light signal reflected by the reflective surface of the parallel plate is called the rear structured light signal, and the structured light signal passing through the parallel plate is called the front structured light signal.

[0066] Specifically, in the embodiment of the present application, the first parallel plate 121a, the second parallel plate 121b, the third parallel plate 121c and the fourth parallel plate 121d are arranged in sequence along the direction of the adjusted optical path 101 and within the range of the adjusted optical path 101, wherein the structured light signal in front of the second parallel plate 121b includes the structured light signal with a wavelength of 450±5nm reflected by the first parallel plate 121a, and the side of the second parallel plate 121b opposite to the reflective surface is coated with an anti-reflection film with a wavelength range of 450±5nm and a transmittance greater than 95%, so as to increase the transmittance of the previous structured light signal and effectively improve the utilization rate of the structured light signal. The structured light signal in front of the third parallel plate 121c includes the structured light signal with a wavelength of 520±5nm reflected by the second parallel plate 121b and the structured light signal with a wavelength of 450±5nm transmitted through the second parallel plate 121b. By adjusting the positions of the first parallel plate 121a and the second parallel plate 121b, the structured light signal reflected by the second parallel plate 121b and the structured light signal transmitted through the second parallel plate 121b are converged into a concentric light beam. The side of the third parallel plate 121c opposite to the reflective surface is coated with an anti-reflection film with a wavelength range of 520±5nm and 450±5nm and a transmittance greater than 95%, so as to increase the transmittance of the structured light signal in front. The structured light signal in front of the fourth parallel plate 121d includes a structured light signal with a wavelength of 690±5nm reflected by the plate 121c and a structured light signal with wavelengths of 520±5nm and 450±5nm respectively transmitted through the parallel plate 121c. By adjusting the positions of the second parallel plate 121b and the third parallel plate 121c, the structured light signal reflected by the fourth plate 121d and the structured light signal transmitted through the fourth parallel plate 121d are converged into a concentric light beam, and the wavelength range of the concentric light beam is 520±5nm, 450±5nm, and 690±5nm. The side of the fourth parallel plate 121d opposite to the reflective surface is coated with an anti-reflection film with a wavelength range of 520±5nm, 450±5nm, and 690±5nm and a transmittance greater than 95%, so as to increase the transmittance of the structured light signal in front. Through the above arrangement, the utilization rate of the structured light signal can be improved, and the structured light signals generated by each dimming module 11 can be converged to generate a structured light convergence beam, so as to increase the light energy required by the micro-radiation array 13.

[0067] like Figure 4As shown, as an optional implementation, the infrared projection simulator 100 also includes a filter module 15, which is arranged on the optical path between the focusing module 12 and the micro-radiation array 13, and the filter module 15 is used to filter out stray light in the structured light convergence beam. Through the above arrangement, the influence of stray light in the structured light convergence beam on the infrared projection simulation can be reduced, and the signal-to-noise ratio of the infrared projection simulator 100 is improved, thereby improving the clarity of the infrared simulation image. In this embodiment, the infrared projection simulator 100 also includes a fifth parallel plate 121e, and the fifth parallel plate 121e is arranged on the optical path between the filter module 15 and the micro-radiation array 13, and the fifth parallel plate 121e is used to reflect the filtered structured light convergence beam to the micro-radiation array 13.

[0068] As an optional implementation, the infrared projection simulator 100 further includes a temperature control module 16, which is used to adjust the temperature of the micro-radiation array 13. By controlling the temperature of the micro-radiation array 13, the micro-radiation array 13 can switch between high and low temperatures at a faster speed, thereby generating an infrared simulation image with a higher frame rate. Specifically, the temperature control module 16 uses a Peltier cooling sheet, which facilitates the control of the temperature control module 16 and reduces the volume and weight of the temperature control module 16.

[0069] like Figure 5 As shown, it shows a schematic diagram of the structure of a single-channel dimming module and a focusing module provided in an embodiment of the present application. The laser emitted by the lighting unit 112 passes through the light homogenizing unit 113 and then irradiates the spatial light modulator 111. The spatial light modulator 111 reflects the laser and then passes through the collimating unit 114 and then irradiates the parallel plates of the focusing module 12. The parallel plates adjust the direction of the light path. After adjusting the light path once or multiple times, the laser irradiates the micro-radiation array 13, causing the micro-radiation array 13 to heat up and radiate infrared light. As an optional implementation method, the infrared projection simulator 100 also includes a light trap module 17, which is used to receive the light beam reflected by the spatial light modulator 111 when the spatial light modulator 111 is in a non-working state. Thereby reducing the crosstalk between the spatial light modulators 111 in different adjustment modules 11 and improving the working stability of the infrared projection simulator 100. The dimming module 11, the focusing module 12 and the light trap module 17 together constitute a single-channel excitation source component. The present application constructs the excitation source of the infrared projection simulator 100 by combining multiple single-channel excitation source components, thereby increasing the total system energy while reducing the energy irradiated on the spatial light modulator 111 per unit time, thereby increasing the continuous working time of the infrared projection simulator 100 and providing long-term stable infrared simulation.

[0070] Specifically, Figure 6As shown, it shows a schematic diagram of the dimming module and focusing module structure of the four-laser beam combination provided in the embodiment of the present application. In the present application, four single-channel excitation source components are combined to construct the excitation source of the infrared projection simulator 100. The single-channel excitation source components that are combined to construct the excitation source of the infrared projection simulator 100 can be set according to actual needs. In the embodiment of the present application, four single-channel excitation source components are used.

[0071] The above disclosure is only the preferred embodiment of the present application, but it is not intended to limit the scope of rights of the present application. A person of ordinary skill in the art can understand that without departing from the spirit and scope of the present application and the appended claims, changes, modifications, substitutions, combinations, and simplifications should all be equivalent replacement methods and still fall within the scope of the invention.

Claims

1. An infrared projection simulator, It is characterized in that The infrared projection simulator comprises: At least two dimming modules, the dimming modules comprising a spatial light modulator and an illumination unit, the illumination unit emitting an illumination light beam to the spatial light modulator, the spatial light modulator being used to modulate the illumination light beam to obtain a structured light signal, the structured light signals generated by the spatial light modulators in each dimming module after modulation have the same modulation information; A focusing module, which is used to focus the structured light signals generated by each dimming module to generate a structured light focused beam; A micro-radiation array, wherein the micro-radiation array receives the structured light convergence beam and generates an infrared simulation image; An infrared window through which the infrared simulation image is emitted.

2. The infrared projection simulator according to claim 1, It is characterized in that In each of the dimming modules, the lighting unit uses a laser, and the laser wavelengths emitted by each of the lasers are different, and the difference in the laser wavelengths emitted by each of the lasers is greater than 20 nm.

3. The infrared projection simulator according to claim 2, It is characterized in that The dimming module further includes a light homogenizing unit, which is used for homogenizing light. The illumination light beam emitted by the illumination unit is irradiated onto the spatial light modulator after passing through the light homogenizing unit.

4. The infrared projection simulator according to claim 3, It is characterized in that The dimming module further includes a collimating unit, which is disposed on an optical path between the spatial light modulator and the light focusing module to collimate the structured light signal emitted by the spatial light modulator and then emit it to the light focusing module.

5. The infrared projection simulator according to claim 2, It is characterized in that The focusing module includes parallel plates corresponding to the number of the dimming modules, and each of the parallel plates is used to respectively reflect a structured light signal emitted by one of the dimming modules to adjust the optical path of the structured light signal emitted by each dimming module so that the adjusted optical paths of the structured light signals emitted by each of the dimming modules are the same; The reflective surface of each of the parallel plates is coated with a total reflective film to achieve maximum reflectivity of any of the parallel plates at the laser wavelength of the corresponding dimming module.

6. The infrared projection simulator according to claim 5, It is characterized in that The parallel plates are arranged along the optical path direction of the structured light signal after adjustment, and the front structured light signal converges with the rear structured light signal into a concentric light beam after passing through the parallel plates; The side of the parallel plate opposite to the reflective surface is coated with at least one layer of anti-reflection film to increase the transmittance of the front structured light signal.

7. The infrared projection simulator according to claim 1, It is characterized in that The infrared projection simulator further comprises a filter module, which is arranged on the optical path between the light focusing module and the micro-radiation array, and is used for filtering out stray light in the structured light convergence beam.

8. The infrared projection simulator according to claim 1, It is characterized in that The infrared projection simulator also includes a temperature control module, which is used to adjust the temperature of the micro-radiation array.

9. The infrared projection simulator according to claim 8, It is characterized in that The temperature control module adopts a Peltier cooling sheet.

10. The infrared projection simulator according to claim 1, It is characterized in that The infrared projection simulator further comprises a light trap module, and the light trap module is used for receiving the light beam reflected by the spatial light modulator when the spatial light modulator is in a non-working state.

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