Broadband target / scene composite characteristic simulation device

Abstract

The invention discloses a broadband target / scene composite characteristic simulation device, and belongs to the field of infrared simulators. Comprising a near-infrared image generator, a medium-wave infrared image generator and a multiband beam combiner, the near-infrared image generator and the medium-wave infrared image generator convert an infrared video into an infrared radiation image through a micro-mirror array device, and infrared radiation of near-infrared and medium-wave infrared bands is combined through the multiband beam combiner; and a broadband infrared radiation image is formed and is projected to an optical system of the tested photoelectric detection product. According to the invention, a broadband and high-fidelity infrared target scene image is provided for a tested photoelectric detection product, the ground test capability is effectively improved, and powerful data support is provided for algorithm development, function debugging and performance evaluation of the photoelectric detection product.

Description

Technical Field

[0001] The invention belongs to the field of infrared simulators, and in particular relates to a wide-band target / scene composite characteristic simulation device. Background Art

[0002] In recent years, the application of photoelectric detection products in the aerospace industry and other fields has developed rapidly. In order to cope with the complex environment in the air and various anti-infrared detection technologies, photoelectric detection products are developing towards multi-sensor composite and intelligent identification.

[0003] The development of photoelectric detection products requires a lot of testing. Traditional field tests are easily affected and interfered by complex environmental factors, and require huge manpower, material and financial resources, making it difficult to conduct multi-batch and multi-mode tests. In addition, the environmental background and targets of field tests change with time, weather and other factors, making it difficult to provide a large amount of data information. Summary of the invention

[0004] Technical issues to be solved:

[0005] In order to avoid the shortcomings of the prior art, the present invention provides a wide-band target / scene composite characteristic simulation device, which converts infrared video into infrared radiation images of corresponding bands through a near-infrared image generator and a medium-wave infrared image generator, and a multi-band beam combiner combines the infrared radiation of the near-infrared and medium-wave infrared bands to form a wide-band infrared radiation image, which is projected into the optical system of the photoelectric detection product under test; the device provides the photoelectric detection product under test with wide-band, high-fidelity infrared target scene images, effectively improves ground testing capabilities, and provides strong data support for algorithm development, function debugging, and performance evaluation of photoelectric detection products.

[0006] The technical solution of the present invention is: a wide-band target / scene composite characteristic simulation device, including a near-infrared image generator, a medium-wave infrared image generator, and a multi-band beam combiner. The near-infrared image generator and the medium-wave infrared image generator both convert infrared videos into infrared radiation images through a micro-mirror array device, and then combine the infrared radiation in the near-infrared and medium-wave infrared bands through the multi-band beam combiner to form a wide-band infrared radiation image, which is projected onto the optical system of the photoelectric detection product under test.

[0007] A further technical solution of the present invention is: the near-infrared image generator includes a DMD chip, a signal processing circuit, a driving circuit, a near-infrared blackbody light source, and a blackbody illumination optical system; the image generation module sends the real-time dynamic image to the near-infrared image generator, and the signal processing circuit converts the brightness signal of the real-time dynamic image into a DMD control signal. Based on the DMD control signal, the driving circuit flips the corresponding micromirror pixels of the micromirror array device, and the flipped micromirror array device reflects the near-infrared radiation incident from the near-infrared blackbody light source to generate a corresponding infrared radiation image.

[0008] A further technical solution of the present invention is: the working band of the near-infrared image generator is 0.65 μm to 0.95 μm, and the simulated illumination is 20 to 1400 Lx.

[0009] A further technical solution of the present invention is: the medium-wave infrared image generator includes a DMD chip, a signal processing circuit, a driving circuit, a medium-wave infrared blackbody light source, and a blackbody illumination optical system; the image generation module sends the real-time dynamic image to the medium-wave infrared image generator, and the signal processing circuit converts the brightness signal of the real-time dynamic image into a DMD control signal. Based on the DMD control signal, the driving circuit flips the corresponding micromirror pixels of the micromirror array device, and the flipped micromirror array device reflects the medium-wave infrared radiation incident from the medium-wave infrared blackbody light source to generate a corresponding infrared radiation image.

[0010] A further technical solution of the present invention is: the working band of the medium-wave infrared image generator is 3 μm to 5 μm, and the simulation temperature range is 25° C. to 100° C.

[0011] A further technical solution of the present invention is: the multi-band beam combiner is used to combine the projection lights of two bands emitted by the near-infrared image generator and the medium-wave infrared image generator into one beam of light, and the incident angles of the light beams emitted by the near-infrared image generator and the medium-wave infrared image generator to the beam combiner are both 45°.

[0012] A further technical solution of the present invention is: the multi-band beam combiner is provided with a primary mirror and a secondary mirror in sequence along the optical path, and the medium-wave infrared light beam is transmitted to the secondary mirror through the primary mirror, and the near-infrared light beam is reflected to the secondary mirror; the medium-wave infrared incident surface of the primary mirror is coated with an anti-reflection film with a transmittance of not less than 90%, and the near-infrared incident surface is coated with an anti-reflection film with a reflectance of not less than 90%; the secondary mirror is coated with an anti-reflection film on both sides to reduce spherical aberration, the near-infrared transmittance is 90%, and the medium-wave infrared transmittance is 85%.

[0013] A further technical solution of the present invention is that a heat sink is provided on the fixing device of the multi-band beam combiner to improve the stability of the beam quality when the working temperature changes.

[0014] A further technical solution of the present invention is that the materials of the primary mirror and the secondary mirror in the multi-band beam combining mirror are both ZnSe materials.

[0015] An application of a wide-band target / scene composite characteristic simulation device, the specific steps are as follows:

[0016] The image generation module sends the real-time dynamic image to the near infrared / medium wave infrared image generator;

[0017] Converting the received infrared video into an infrared radiation image through a near infrared / medium wave infrared image generator;

[0018] The infrared radiation in the near-infrared and medium-wave infrared bands is combined by a multi-band beam combiner to form a wide-band infrared radiation image, which is projected into the optical system of the photoelectric detection product under test and serves as the input image excitation of the target information processor of the photoelectric system. It is used for debugging and verification of image detection algorithms and image detection equipment.

[0019] Beneficial Effects

[0020] The beneficial effects of the present invention are as follows: the present invention provides a wide-band target / scene composite characteristic simulation device, which can convert infrared digital video images into video images of composite near-infrared and medium-wave infrared band target scene radiation characteristics, and project them into the optical system of photoelectric detection products. It can not only serve as data support for the development of photoelectric detection product algorithms, but also provide a simulation test environment for the functional performance evaluation of photoelectric detection products.

[0021] The semi-physical simulation technology of the device of the present invention is of great significance for the functional performance test and evaluation of photoelectric detection products in complex environments. The infrared target / scene simulation device is an important part of the semi-physical simulation system. Through the semi-physical simulation technology, the battlefield environment is simulated under laboratory conditions to provide data support for the test and evaluation of photoelectric detection products, which can effectively shorten the development cycle of photoelectric detection products and save a lot of test funds. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a product composition diagram of the present invention;

[0023] Figure 2 It is a composition diagram of the infrared image generator of the present invention;

[0024] Figure 3 It is a schematic diagram of the use of the semi-physical simulation of the present invention.

[0025] Explanation of the accompanying drawings: 1. Photoelectric detection product, 2. Near-infrared image generator, 3. Medium-wave infrared image generator, 4. Multi-band beam combining mirror group. DETAILED DESCRIPTION

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0027] Based on the fact that the current traditional field test is easily affected and disturbed by complex environmental factors, and requires huge manpower, material resources, and financial resources, it is difficult to conduct multi-batch, multi-mode tests. In addition, the environmental background and target of the field test are constantly changing with time and weather factors, making it difficult to provide a large amount of data information. The present invention provides a wide-band target / scene composite characteristic simulation device, including a near-infrared image generator, a medium-wave infrared image generator, and a multi-band beam combiner. The near-infrared image generator and the medium-wave infrared image generator both convert infrared video into infrared radiation images through a micro-mirror array device, and then combine the infrared radiation of the near-infrared and medium-wave infrared bands through a multi-band beam combiner to form a wide-band infrared radiation image, which is projected into the optical system of the photoelectric detection product under test. Among them, the near-infrared and medium-wave infrared image generators both use micro-mirror array devices (DMD) to realize the conversion of infrared video to infrared radiation images.

[0028] The near-infrared image generator has an operating band of 0.65 μm to 0.95 μm and can simulate an illumination of 20 to 1400 Lx. The medium-wave infrared image generator has an operating band of 3 μm to 5 μm and can simulate a temperature range of 25°C to 100°C.

[0029] The multi-band beam combiner is made of ZnSe material, and the incident angles of near-infrared and mid-wave infrared are both 45°. The multi-band beam combiner includes a primary mirror and a secondary mirror arranged in sequence along the optical path. The mid-wave infrared incident surface of the primary mirror is coated with an anti-reflection film with a transmittance of not less than 90%, and the near-infrared incident surface is coated with an anti-reflection film with a reflectivity of not less than 90%; the secondary mirror is coated with an anti-reflection film on both sides to reduce spherical aberration, and the near-infrared and mid-wave infrared transmittances are 90% and 85% respectively. A heat sink is provided on the beam combiner fixing device to improve the stability of the beam quality when the working temperature changes.

[0030] The above technical solution is further described below in conjunction with the accompanying drawings:

[0031] Reference Figure 1 As shown, the present embodiment is a wide-band target / scene composite characteristic simulation device, including three parts: a near-infrared image generator, a medium-wave infrared image generator, and a multi-band beam combiner. The near-infrared and medium-wave infrared image generators adopt a micro-mirror array device (DMD)-based implementation method to convert real-time dynamic image signals into physical scenes in the infrared band. The multi-band beam combiner adopts a co-aperture design for two bands. A multi-band beam combiner group is used inside the device to combine the beams multiple times to combine the projection light of the two bands into one beam of light, thereby forming a video image of the radiation characteristics of the composite near-infrared and infrared band target scene, which is finally projected into the optical system of the photoelectric detection product under test.

[0032] Reference Figure 2 As shown, the infrared image generator in this embodiment is composed of a DMD chip, a signal processing and driving circuit, a precision black body light source and a temperature control circuit, a black body illumination optical system, a projection matching optical system and structural components. The brightness signal of the real-time dynamic image is converted into a DMD control signal by the signal processing circuit. The DMD performs corresponding micro-mirror pixel flipping according to the control signal, reflects the infrared radiation incident from the black body, and generates a corresponding infrared radiation image.

[0033] Reference Figure 3 As shown, this is the use of semi-physical simulation of this embodiment, in which: the near-infrared and medium-wave infrared image generators convert real-time dynamic image signals into radiation signals of corresponding infrared bands, and the radiation signals output by the two image generators are combined into one beam through a multi-band beam combiner, and projected into the optical system of the photoelectric detection product under test as an image stimulus for the photoelectric detection product. The flight motion platform simulation device is used to install the wide-band simulation device and the photoelectric detection device under test to ensure that the wide-band simulation device is aligned with the optical system of the device under test.

[0034] Specifically, the function of the near-infrared image generator and the medium-wave infrared image generator is to convert the real-time dynamic image signal into a physical scene in the infrared band, and project it onto the photosensitive surface of the detector of the tested optoelectronic product through a collimating optical system.

[0035] Specifically, the near-infrared image generator and the medium-wave infrared image generator are implemented based on a micromirror array device (DMD). The digital micromirror array (DMD) uses advanced semiconductor processing technology to prepare a precise metal micromirror array on a silicon substrate, and uses electronic methods to switch these mirrors to control the reflection direction of external light for each pixel. The infrared radiation is modulated by the deflection of the micromirror array to generate an infrared scene image. The image output of a specific band can be generated by irradiating the DMD device with a light source of that band. Each micromirror produces a pixel. The switch operates quickly at a speed of 10 microseconds, and a linear image grayscale with a large dynamic range is achieved through high-speed reaction.

[0036] Specifically, the grayscale of the digital micromirror array (DMD) output image is achieved through pulse width modulation, that is, the longer the time the micromirror pixel reflects high-temperature blackbody radiation within the corresponding infrared detector light integration time, the higher the brightness of the corresponding pixel. The actual micromirror image display driving circuit makes the micromirror pixel turn on in one frame time, which is linearly related to the input image. The on state means that the micromirror reflects high-temperature blackbody radiation. The longer the on time, the larger the grayscale value corresponding to the pixel, and the brighter the pixel.

[0037] The working process of this embodiment is:

[0038] The dynamic image signal is transmitted to the controller, and the image brightness signal is converted into a DMD control signal through the signal processing circuit, which then drives the corresponding pixel of the DMD chip to flip; the black body is imaged on the DMD through the illumination system to achieve uniform illumination; the DMD reflects and modulates the incident infrared radiation to produce an infrared image; the generated infrared image is projected through the projection system through the multi-band beam combining lens group to the entrance pupil of the detector of the device under test.

[0039] The infrared radiation images output by the near-infrared image generator and the medium-wave infrared image generator are combined multiple times through a multi-band beam combining lens group with a common aperture design, and the common aperture field of view of the two bands is combined into one beam of light, which is projected into the optical system of the photoelectric detection product under test. It is used as the input image stimulus of the target information processor of the photoelectric system and is used for debugging and verification of image detection algorithms and image detection equipment.

[0040] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A wide-band target / scene composite characteristic simulation device, characterized in that: It includes a near-infrared image generator, a medium-wave infrared image generator, and a multi-band beam combiner. The near-infrared image generator and the medium-wave infrared image generator both convert infrared videos into infrared radiation images through a micro-mirror array device, and then combine the infrared radiation in the near-infrared and medium-wave infrared bands through a multi-band beam combiner to form a wide-band infrared radiation image, which is projected onto the optical system of the photoelectric detection product under test.

2. A wide-band target / scene composite characteristic simulation device according to claim 1, characterized in that: The near-infrared image generator comprises a DMD chip, a signal processing circuit, a driving circuit, a near-infrared blackbody light source, and a blackbody illumination optical system; an image generation module sends a real-time dynamic image to the near-infrared image generator, and the signal processing circuit converts the brightness signal of the real-time dynamic image into a DMD control signal; based on the DMD control signal, the driving circuit flips the corresponding micromirror pixels of the micromirror array device, and the flipped micromirror array device reflects the near-infrared radiation incident from the near-infrared blackbody light source to generate a corresponding infrared radiation image.

3. A wide-band target / scene composite characteristic simulation device according to claim 2, characterized in that: The near-infrared image generator has an operating band of 0.65 μm to 0.95 μm and a simulated illumination of 20 to 1400 Lx.

4. A wide-band target / scene composite characteristic simulation device according to claim 1, characterized in that: The medium-wave infrared image generator comprises a DMD chip, a signal processing circuit, a driving circuit, a medium-wave infrared blackbody light source, and a blackbody illumination optical system; an image generation module sends a real-time dynamic image to the medium-wave infrared image generator, and the signal processing circuit converts the brightness signal of the real-time dynamic image into a DMD control signal; based on the DMD control signal, the driving circuit flips the corresponding micromirror pixels of the micromirror array device, and the flipped micromirror array device reflects the medium-wave infrared radiation incident from the medium-wave infrared blackbody light source to generate a corresponding infrared radiation image.

5. A wide-band target / scene composite characteristic simulation device according to claim 4, characterized in that: The medium-wave infrared image generator has an operating band of 3 μm to 5 μm and a simulated temperature range of 25° C. to 100° C.

6. The wide-band target / scene composite characteristic simulation device according to claim 1, characterized in that: The multi-band beam combiner is used to combine the projection lights of two bands emitted by the near-infrared image generator and the medium-wave infrared image generator into one beam of light, and the incident angles of the light beams emitted by the near-infrared image generator and the medium-wave infrared image generator to the beam combiner are both 45°.

7. A wide-band target / scene composite characteristic simulation device according to claim 6, characterized in that: The multi-band beam combiner is provided with a primary mirror and a secondary mirror in sequence along the optical path, and the medium-wave infrared beam is transmitted to the secondary mirror through the primary mirror, and the near-infrared beam is reflected to the secondary mirror; the medium-wave infrared incident surface of the primary mirror is coated with an anti-reflection film with a transmittance of not less than 90%, and the near-infrared incident surface is coated with an anti-reflection film with a reflectivity of not less than 90%; the secondary mirror is coated with an anti-reflection film on both sides to reduce spherical aberration, the near-infrared transmittance is 90%, and the medium-wave infrared transmittance is 85%.

8. A wide-band target / scene composite characteristic simulation device according to claim 7, characterized in that: A heat sink is provided on the fixing device of the multi-band beam combining mirror to improve the stability of the beam quality when the working temperature changes.

9. A wide-band target / scene composite characteristic simulation device according to claim 8, characterized in that: The materials of the primary mirror and the secondary mirror in the multi-band beam combining mirror are both ZnSe materials.

10. An application of the wide-band target / scene composite characteristic simulation device according to any one of claims 1 to 9, characterized in that The specific steps are as follows: The image generation module sends the real-time dynamic image to the near infrared / medium wave infrared image generator; Converting the received infrared video into an infrared radiation image through a near infrared / medium wave infrared image generator; The infrared radiation in the near-infrared and medium-wave infrared bands is combined by a multi-band beam combiner to form a wide-band infrared radiation image, which is projected into the optical system of the photoelectric detection product under test and serves as the input image excitation of the target information processor of the photoelectric system. It is used for debugging and verification of image detection algorithms and image detection equipment.

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