CN114486182B - Multiband dynamic target simulation device based on DMD spatial light modulation technology - Google Patents
Multiband dynamic target simulation device based on DMD spatial light modulation technology Download PDFInfo
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Abstract
The invention relates to the technical field of optical metering and detection, in particular to a multiband dynamic target simulation device based on a DMD spatial light modulation technology, which comprises a light source system, an integrating sphere system, an optical path collimation system, a DMD micro-mirror array, a lens assembly, a multiband camera and a display and control cabinet. The integrating sphere system is arranged opposite to the light source system; the light path collimation system is arranged between the integrating sphere system and the DMD micro mirror array; the lens component is arranged between the DMD micro-mirror array and the multiband camera; the display and control cabinet is respectively connected with the light source system, the DMD micro mirror array and the multiband camera. The multiband dynamic target simulation device based on the DMD spatial light modulation technology provided by the invention simulates the visible light and near infrared multiband dynamic target by adopting the DMD spatial light modulation technology, can solve the limit of the existing simulation technology on the imaging target characteristics and wave bands, realizes multiband dynamic target simulation of high frame frequency and arbitrary shape patterns, and covers the visible light and near infrared.
Description
Technical Field
The invention relates to the technical field of optical metering and detection, in particular to a multiband dynamic target simulation device based on a DMD spatial light modulation technology.
Background
When the photoelectric landing guiding equipment is calibrated, the performance of the photoelectric landing guiding equipment needs to be tested by adopting a simulation target. For target simulation, the current device design is to place a target board of a target feature pattern on a focal plane of an optical system, and the target board forms parallel light output through refraction or reflection of a lens group in the optical system, so as to simulate a static target at infinity. However, the conventional collimator analog imaging method is limited to the characteristics of the imaging target, so that the requirements of covering multiple bands such as visible light, near infrared and the like are not easily met, and the high-frame-rate dynamic target simulation cannot be realized.
Disclosure of Invention
Aiming at the technical problems that the parallel light pipe simulation imaging method in the prior art has limitation on the characteristics of an imaging target, is not easy to meet the requirements of covering multiple bands such as visible light, near infrared and the like, and can not realize the high-frame-frequency dynamic target simulation, the invention provides a multi-band dynamic target simulation device based on the DMD spatial light modulation technology.
The technical scheme for solving the technical problems is as follows:
a multi-band dynamic target simulation device based on DMD spatial light modulation technology, comprising: the system comprises a light source system, an integrating sphere system, a light path collimation system, a DMD micro mirror array, a lens assembly, a multiband camera and a display and control cabinet;
the integrating sphere system is arranged opposite to the light source system; the light source system emits light with single wavelength to be incident to the integrating sphere system, and the integrating sphere system is used for generating a uniform surface light source;
the light path collimation system is arranged between the integrating sphere system and the DMD micro mirror array; the surface light source generated by the integrating sphere system generates collimated uniform light through the light path collimating system to irradiate the DMD micro-mirror array; the DMD micro-mirror array generates a simulated target image;
the lens assembly is disposed between the DMD micro-mirror array and the multiband camera; the DMD micro-mirror array generates a simulated target image beam to be projected on the multiband camera through the lens component, and the multiband camera displays visible light and infrared dynamic target images;
the display and control cabinet is respectively connected with the light source system, the DMD micro mirror array and the multiband camera.
Further, the light source system includes: an illumination source, a grating monochromator and an adjustable slit;
the illumination light source is arranged opposite to the grating monochromator; the illumination light source emits visible light and near infrared, the visible light and the near infrared are incident to the grating monochromator, and the grating monochromator divides the visible light and the near infrared into light with a single wavelength;
the grating monochromator is arranged opposite to the integrating sphere system, and the adjustable slit is arranged between the grating monochromator and the adjustable slit; the adjustable slit is used for adjusting the brightness of the light beam.
Further, the illumination light source is a high-power broad-spectrum hernia light source, and the spectrum range is 240-2500nm.
Furthermore, the grating monochromator is used for compound wave band light splitting, and the light splitting range is 400-2500nm.
Further, the movable range of the adjustable slit is 0-40mm.
Further, the integrating sphere system includes: a large integrating sphere and a small integrating sphere;
the inlets of the large integrating sphere and the small integrating sphere are arranged opposite to the light source system; the outlet of the large integrating sphere and the outlet of the small integrating sphere are arranged opposite to the light path collimation system.
Further, the magnification of the lens assembly is a ratio of a resolution of a DMD chip in the DMD micro-mirror array to a target surface resolution of the multiband camera.
Further, the multiband camera employs an InGaAs detector; the detection wave band of the multiband camera is 400-1700nm.
Further, the method further comprises the following steps: a vibration isolation optical platform; the vibration isolation optical platform is provided with a darkroom;
the vibration isolation optical platform includes: a top plate, a bottom plate and a steel honeycomb core;
the steel honeycomb core is arranged between the top plate and the bottom plate; the light source system, the integrating sphere system, the light path collimation system, the DMD micro mirror array, the lens component, the multiband camera and the display and control cabinet are arranged on the top plate.
The multiband dynamic target simulation device based on the DMD spatial light modulation technology provided by the invention has at least the following beneficial effects or advantages:
the invention provides a multiband dynamic target simulation device based on a DMD spatial light modulation technology, wherein an integrating sphere system and a light source system are oppositely arranged; the light source system emits light with a single wavelength to be incident on the integrating sphere system. The light path collimation system is arranged between the integrating sphere system and the DMD micro mirror array; the surface light source generated by the integrating sphere system generates collimated uniform light to irradiate the DMD micro-mirror array through the light path collimation system; the DMD micromirror array generates a simulated target image. The lens component is arranged between the DMD micro-mirror array and the multiband camera; the DMD micro-mirror array generates a simulated target image beam which is projected on the multiband camera through the lens component, and the multiband camera displays visible light and infrared dynamic target images. The display and control cabinet is respectively connected with the light source system, the DMD micro mirror array and the multiband camera. The multiband dynamic target simulation device based on the DMD spatial light modulation technology provided by the invention simulates visible light and near infrared multiband dynamic targets by adopting the DMD spatial light modulation technology, can solve the limit of the existing simulation technology on imaging target characteristics and wave bands, realizes multiband dynamic target simulation of high frame frequency and arbitrary shape patterns, and covers visible light and near infrared in the wave band range of 400nm to 2500nm. The multiband dynamic target simulation device based on the DMD spatial light modulation technology has the advantages of high resolution, high input frame frequency, full digital control, high stability and multiband.
Drawings
Fig. 1 is a schematic structural diagram of a multiband dynamic target simulation device based on a DMD spatial light modulation technology according to an embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
the vibration isolation system comprises a 1-vibration isolation optical platform, a 2-illumination light source, a 3-grating monochromator, a 4-adjustable slit, a 5-integrating sphere system, a 6-light path collimation system, a 7-DMD micro mirror array, an 8-lens assembly, a 9-multiband camera, a 10-display and control cabinet and an 11-light source system.
Detailed Description
Aiming at the technical problems that the parallel light pipe simulation imaging method in the prior art has limitation on the characteristics of an imaging target, is not easy to meet the requirements of covering multiple bands such as visible light, near infrared and the like, and can not realize the high-frame-frequency dynamic target simulation, the invention provides a multi-band dynamic target simulation device based on the DMD spatial light modulation technology.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that terms such as "upper", "lower", "front", "rear", "left", "right", and the like in the embodiments indicate terms of orientation, and only for simplifying the description based on the positional relationship of the drawings in the specification, do not represent that the elements and devices and the like referred to must be operated according to the specific orientation and the defined operations and methods, configurations in the specification, and such orientation terms do not constitute limitations of the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in combination with specific cases.
The embodiment of the invention provides a multiband dynamic target simulation device based on a DMD spatial light modulation technology, which mainly comprises the following components in part by weight as shown in figure 1: a light source system 11, an integrating sphere system 5, an optical path collimation system 6, a DMD micro mirror array 7, a lens component 8, a multiband camera 9 and a display and control cabinet 10. Wherein: the integrating sphere system 5 is arranged opposite to the light source system 11; the light source system 11 emits light of a single wavelength to be incident on the integrating sphere system 5, and the integrating sphere system 5 is used to generate a uniform surface light source. The light path collimation system 6 is arranged between the integrating sphere system 5 and the DMD micro mirror array 7; the surface light source generated by the integrating sphere system 5 generates collimated uniform light to irradiate the DMD micro mirror array 7 through the light path collimating system 6; the DMD micromirror array 7 generates a simulation target image. A lens assembly 8 is disposed between the DMD micro-mirror array 7 and the multiband camera 9; the DMD micro-mirror array 7 generates a simulated target image beam to be projected on the multiband camera 9 through the lens assembly 8, and the multiband camera 9 is used for testing the performance of the multiband dynamic target simulation device based on the DMD spatial light modulation technology, and the band range covers the visible light and the near infrared band. The display and control cabinet 10 is connected to the light source system 11, the DMD micromirror array 7, and the multiband camera 9, respectively, and the display and control cabinet 10 performs related control and display functions.
As shown in fig. 1, the following describes the parts of the multi-band dynamic target simulation device based on DMD spatial light modulation technology:
the light source system 11 includes: an illumination light source 2, a grating monochromator 3 and an adjustable slit 4. The illumination light source 2 is arranged opposite to the grating monochromator 3; the illumination light source 2 emits visible light and near infrared light, the visible light and the near infrared light are incident to the grating monochromator 3, and the grating monochromator 3 divides the visible light and the near infrared light into light of a single wavelength. The grating monochromator 3 is arranged opposite to the integrating sphere system 5, and the adjustable slit 4 is arranged between the grating monochromator 3 and the adjustable slit 4; the adjustable slit 4 is used to adjust the brightness of the light beam. In this embodiment, the illumination source 2 is a high-power wide-spectrum hernia light source, the spectrum range is 240-2500nm, the spectrum range covers visible light and near infrared spectrum bands, and the brightness of the emergent light can be controlled and regulated by a power supply. The grating monochromator 3 is used for compound wave band light splitting, the light splitting range is 400-2500nm, the resolution ratio is better than 10nm, visible light and near infrared spectrum wave bands are covered, R232 serial communication is adopted, and the light splitting wave band is regulated by an upper computer. The movable range of the adjustable slit 4 is 0-40mm, and the adjustable slit 4 can be adjusted by an electric controller.
The integrating sphere system 5 includes: large integrating sphere and small integrating sphere. The inlets of the large integrating sphere and the small integrating sphere are arranged opposite to the light source system 11; the outlet of the large integrating sphere and the outlet of the small integrating sphere are arranged opposite to the light path collimation system 6. The small integrating sphere can reflect the monochromatic light for multiple times inside the sphere, so that a uniform light spot is generated at the outlet. The small integrating sphere is formed by spinning an aluminum alloy material, and no butt welding spots exist, so that higher precision is ensured; the inner wall of the ball is sprayed with a high-uniformity coating, so that the uniformity and stability of the outlet are ensured; the small integrating sphere adopts a double-outlet design, the outlet adopts a diameter of 200mm, and the diameter of the small opening avoids the attenuation of emergent light to be too weak, so that the subsequent light path design is convenient. The large integrating sphere can reflect the composite light multiple times inside the sphere, thereby generating a uniform light spot at the exit. The large integrating sphere is formed by spinning an aluminum alloy material, and no butt welding spots exist, so that higher precision is ensured; the inner wall of the ball is sprayed with a high-uniformity coating, so that the uniformity and stability of the outlet are ensured; the large integrating sphere is also designed with double outlets, and the diameter of the outlet is 500mm, so that the subsequent light path design is facilitated.
The DMD micromirror array 7 consists of an optical head and a control circuit board, which is packaged in a circuit box, and the optical head can be mounted on a flange ring, and thus on other optical element holders. The circuit board is connected with the power adapter through a power line, can be connected with 220V to work normally, the high-speed data line is connected to the industrial personal computer through the USB, and the loading and the releasing of images are carried out through industrial personal computer software, and the resolution ratio is 1280 x 800.
The lens component 8 is an optical path component between the two optical systems of the DMD micro-mirror array 7 and the multiband camera 9, and the magnification of the lens component 8 is the ratio of the resolution of the DMD chip in the DMD micro-mirror array 7 to the resolution of the target surface of the multiband camera 9.
The multiband camera 9 is used for testing the device performance of the target simulator, and the multiband camera 9 adopts an InGaAs detector; the detection band of the multiband camera 9 is 400-1700nm, and the resolution is 640 x 512.
The display and control cabinet 10 is used for controlling the illumination light source 2 and the grating monochromator 3, generating needed background light, developing the DMD chip, processing image data, generating corresponding image video data, performing different configuration operations on the multiband camera 9 software, and testing the performance of the DMD.
The composite visible light near infrared illumination light source 2 is divided into spectrums with single wavelength required by test by the grating monochromator 3, enters a large integrating sphere or a small integrating sphere, generates a uniform area light source at an outlet, and the brightness of the light source is regulated by the adjustable slit 4 of the grating monochromator 3. The light emitted by the light source can be very weak after passing through the monochromator and then the integrating sphere, which is unfavorable for imaging of a simulation target, so that the imaging of monochromatic light is realized by adopting the form of two integrating spheres, and the imaging of compound light is realized by adopting the small integrating sphere and the large integrating sphere. The uniform surface light source generates collimated uniform light to irradiate the DMD micro mirror array 7 through the light path collimating system 6, a simulation target image is generated through micro mirror overturning, and then the simulation target can be projected on the target surface of the tested multiband camera 9 through the lens component 8, so that simulation of visible light and near infrared dynamic targets is realized.
In order to further improve the simulation precision, a preferred embodiment of the present invention is further provided with: a vibration isolation optical platform 1; the vibration isolation optical platform 1 is provided with a darkroom which adopts light-proof acrylic materials. The vibration isolation optical platform 1 includes: a top plate, a bottom plate and a steel honeycomb core. The steel honeycomb inner core is arranged between the top plate and the bottom plate; can provide enough rigidity under the premise of reducing weight; the upper surface of the top plate is provided with mounting holes for mounting and fixing various instruments and equipment. The light source system 11, the integrating sphere system 5, the optical path collimation system 6, the DMD micro mirror array 7, the lens component 8, the multiband camera 9 and the display and control cabinet 10 are arranged on the top plate.
Referring to fig. 1, the following describes the working procedure of the multi-band dynamic target simulation device based on DMD spatial light modulation technology according to a specific embodiment:
step one: the illumination light source 2, the grating monochromator 3, the adjustable slit 4, the small integrating sphere, the large integrating sphere, the DMD micro-mirror array 7, the power line and the data transmission line of the multiband camera 9 are connected.
Step two: the illumination source 2 is preheated for one minute by turning on the power supply and turning on the display through the display and control cabinet 10.
Step three: the digital power supply voltage of the illumination light source 2 is adjusted to 12V, the current does not exceed 3.1A, and the light intensity is changed by slightly adjusting the current value.
Step four: and (3) opening the upper computer software of the grating monochromator 3, and selecting a specific spectral range to enable monochromatic light of a corresponding wave band to enter an integrating sphere for reflection.
Step five: opening working software of the DMD micro mirror array 7, clicking and initializing, automatically distributing a DMD device in an idle state to an application program by the system, and initializing the device; clicking and loading, wherein the software loads the image with preset patterns and corresponding resolution; clicking projection can project the image, and the frame frequency of the image can be changed by changing the refresh frequency, so that dynamic simulation is realized; in the light source control, the type and the brightness of an external light source are set, so that the DMD can reflect light of a selected wave band through the irradiation of the external light source, and the target simulation of different wave bands is realized;
step six: and opening working software of the multiband camera 9, selecting USB interface for transmission, and displaying a host software working interface.
Step seven: the light path collimation system 6 and the lens component 8 are adjusted, so that an integrating sphere or emergent uniform light spot irradiates on the DMD micro-mirror array 7, the DMD micro-mirror array 7 can reflect light with different wave bands, and a set pattern target is projected onto the multi-wave band camera 9 through the lens component 8.
Step eight: and adjusting working software of the multiband camera 9, selecting different image brightness, contrast, compensation, integration and single-point correction, and when a proper image target appears, clicking different positions through a mouse, and automatically displaying coordinates and gray values of the software interface. Thus, the device completes the embodiment of one-time multiband dynamic target simulation.
The multiband dynamic target simulation device based on the DMD spatial light modulation technology provided by the invention has at least the following beneficial effects or advantages:
the invention provides a multiband dynamic target simulation device based on a DMD spatial light modulation technology, wherein an integrating sphere system and a light source system are oppositely arranged; the light source system emits light with a single wavelength to be incident on the integrating sphere system. The light path collimation system is arranged between the integrating sphere system and the DMD micro mirror array; the surface light source generated by the integrating sphere system generates collimated uniform light to irradiate the DMD micro-mirror array through the light path collimation system; the DMD micromirror array generates a simulated target image. The lens component is arranged between the DMD micro-mirror array and the multiband camera; the DMD micro-mirror array generates a simulated target image beam which is projected on the multiband camera through the lens component, and the multiband camera displays visible light and infrared dynamic target images. The display and control cabinet is respectively connected with the light source system, the DMD micro mirror array and the multiband camera. The multiband dynamic target simulation device based on the DMD spatial light modulation technology provided by the invention simulates visible light and near infrared multiband dynamic targets by adopting the DMD spatial light modulation technology, can solve the limit of the existing simulation technology on imaging target characteristics and wave bands, realizes multiband dynamic target simulation of high frame frequency and arbitrary shape patterns, and covers visible light and near infrared in the wave band range of 400nm to 2500nm. The multiband dynamic target simulation device based on the DMD spatial light modulation technology has the advantages of high resolution (1280 x 800), high input frame frequency (258 Hz), full digital control, high stability and multiband.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. A multi-band dynamic target simulation device based on DMD spatial light modulation technology, comprising: the system comprises a light source system, an integrating sphere system, a light path collimation system, a DMD micro mirror array, a lens assembly, a multiband camera and a display and control cabinet;
the integrating sphere system is arranged opposite to the light source system; the light source system emits light with single wavelength to be incident to the integrating sphere system, and the integrating sphere system is used for generating a uniform surface light source;
the light path collimation system is arranged between the integrating sphere system and the DMD micro mirror array; the surface light source generated by the integrating sphere system generates collimated uniform light through the light path collimating system to irradiate the DMD micro-mirror array; the DMD micro-mirror array generates a simulated target image;
the lens assembly is disposed between the DMD micro-mirror array and the multiband camera; the DMD micro-mirror array generates a simulated target image beam to be projected on the multiband camera through the lens component, and the multiband camera displays visible light and infrared dynamic target images;
the display and control cabinet is respectively connected with the light source system, the DMD micro-mirror array and the multiband camera;
the light source system includes: an illumination source, a grating monochromator and an adjustable slit;
the illumination light source is arranged opposite to the grating monochromator; the illumination light source emits visible light and near infrared, the visible light and the near infrared are incident to the grating monochromator, and the grating monochromator divides the visible light and the near infrared into light with a single wavelength;
the grating monochromator is arranged opposite to the integrating sphere system, and the adjustable slit is arranged between the grating monochromator and the integrating sphere system; the adjustable slit is used for adjusting the brightness of the light beam;
the integrating sphere system includes: a large integrating sphere and a small integrating sphere;
the inlets of the large integrating sphere and the small integrating sphere are arranged opposite to the light source system; the outlet of the large integrating sphere and the outlet of the small integrating sphere are arranged opposite to the light path collimation system.
2. The multi-band dynamic target simulation device based on the DMD spatial light modulation technology according to claim 1, wherein the illumination light source is a high-power wide-spectrum hernia light source, and the spectrum range is 240-2500nm.
3. The multi-band dynamic target simulation device based on the DMD spatial light modulation technology according to claim 2, wherein the grating monochromator is used for compound band light splitting, and the light splitting range is 400-2500nm.
4. The device of claim 2, wherein the adjustable slit has a range of motion of 0-40mm.
5. The DMD spatial light modulation technique-based multiband dynamic target simulation device of claim 1, wherein the magnification of the lens assembly is a ratio of a DMD chip resolution in a DMD micromirror array to a target surface resolution of the multiband camera.
6. The DMD spatial light modulation technique-based multiband dynamic target simulation device according to claim 1, wherein the multiband camera employs InGaAs detector; the detection wave band of the multiband camera is 400-1700nm.
7. The DMD spatial light modulation technique-based multiband dynamic target simulation device according to any one of claims 1 to 6, further comprising: a vibration isolation optical platform; the vibration isolation optical platform is provided with a darkroom;
the vibration isolation optical platform includes: a top plate, a bottom plate and a steel honeycomb core;
the steel honeycomb core is arranged between the top plate and the bottom plate; the light source system, the integrating sphere system, the light path collimation system, the DMD micro mirror array, the lens component, the multiband camera and the display and control cabinet are arranged on the top plate.
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| CN108445697A (en) * | 2018-03-12 | 2018-08-24 | 中国科学院光电技术研究所 | A kind of target simulator based on Digital Micromirror Device |
| CN109632267A (en) * | 2018-12-06 | 2019-04-16 | 中国科学院长春光学精密机械与物理研究所 | A kind of dynamic optical target simulator and dynamic imaging test equipment and method |
| CN109682473A (en) * | 2019-01-02 | 2019-04-26 | 上海倍蓝光电科技有限公司 | A kind of adjustable uniform source of light system of spatial distribution |
| CN110958450A (en) * | 2019-12-29 | 2020-04-03 | 中国科学院西安光学精密机械研究所 | Imaging system space testing device and contrast and frequency testing method |
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