CN114486182A - 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 measurement and detection, in particular to a multiband dynamic target simulation device based on a DMD spatial light modulation technology. 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 visible light and near infrared multiband dynamic targets by adopting the DMD spatial light modulation technology, can solve the problem that the existing simulation technology limits the characteristics and waveband of imaging targets, realizes multiband dynamic target simulation of high frame frequency and patterns in any shapes, and covers visible light and near infrared.
Description
Technical Field
The invention relates to the technical field of optical measurement and detection, in particular to a multiband dynamic target simulation device based on a DMD spatial light modulation technology.
Background
When the photoelectric landing guide equipment is calibrated, a simulation target is required to be adopted to carry out performance test on the photoelectric landing guide equipment. For target simulation, the currently common device design is to place a target plate of a target feature pattern on a focal plane of an optical system, and the target plate 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 tube analog imaging method limits the characteristics of an imaging target, is not easy to meet the requirements of covering multiple bands of visible light, near infrared and the like, and cannot realize high-frame-frequency dynamic target simulation.
Disclosure of Invention
The invention provides a multiband dynamic target simulation device based on DMD spatial light modulation technology, aiming at the technical problems that the method for simulating imaging by using a collimator tube in the prior art limits the characteristics of an imaging target, cannot easily meet the requirements of covering multiband of visible light, near infrared and the like, and cannot realize dynamic target simulation of high frame frequency.
The technical scheme for solving the technical problems is as follows:
a multiband dynamic target simulation device based on DMD spatial light modulation technology comprises: the device comprises a light source system, an integrating sphere system, a light path collimation system, a DMD micro-mirror array, a lens assembly, a multi-band 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 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 collimation 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 multi-band camera; the DMD micro-mirror array generates simulated target image light beams which are projected on the multi-band camera through the lens assembly, and the multi-band 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 light 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 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 wide-spectrum hernia lamp light source, and the spectrum range is 240-2500 nm.
Further, the grating monochromator is used for light splitting in a composite waveband, and the light splitting range is 400-2500 nm.
Furthermore, the movable range of the adjustable slit is 0-40 mm.
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 opposite to the light source system; and the outlets of the large integrating sphere and the small integrating sphere are opposite to the light path collimation system.
Further, the magnification of the lens assembly is the ratio of the resolution of the DMD chip in the DMD micro-mirror array to the resolution of the target surface of the multi-band camera.
Further, the multiband camera adopts an InGaAs detector; the detection band of the multi-band camera is 400-1700 nm.
Further, the method also 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 inner 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 assembly, 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 at least has 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 arranged oppositely; the light source system emits light with a single wavelength to 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 uniform collimation light through the light path collimation system to irradiate the DMD micro-mirror array; the DMD micromirror array generates an analog target image. The lens component is arranged between the DMD micro-mirror array and the multiband camera; the DMD micro-mirror array generates simulated target image light beams which are projected on the multi-band camera through the lens assembly, and the multi-band 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 problem that the existing simulation technology limits the characteristics and wave bands of imaging targets, realizes multiband dynamic target simulation of high frame frequency and patterns in any shapes, and has the wave band range of 400nm to 2500nm and covers visible light and near infrared. 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 apparatus based on a DMD spatial light modulation technique according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
the system comprises a vibration isolation optical platform 1, an illumination light source 2, a grating monochromator 3, an adjustable slit 4, an integrating sphere system 5, an optical path collimation system 6, a DMD micro-mirror array 7, a lens assembly 8, a multiband camera 9, a display and control cabinet 10 and a light source system 11.
Detailed Description
The invention provides a multiband dynamic target simulation device based on DMD spatial light modulation technology, aiming at the technical problems that the method for simulating imaging by using a collimator tube in the prior art limits the characteristics of an imaging target, cannot easily meet the requirements of covering multiband of visible light, near infrared and the like, and cannot realize dynamic target simulation of high frame frequency.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present 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 are used only for simplifying the positional relationship based on the drawings of the specification, and do not represent that the elements, devices, and the like which are referred to must operate according to the specific orientation and the defined operation and method, configuration in the specification, and such terms of orientation do not constitute a limitation of the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
The embodiment of the invention provides a multiband dynamic target simulation device based on DMD spatial light modulation technology, referring to FIG. 1, which mainly comprises: a light source system 11, an integrating sphere system 5, a light 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 with a single wavelength to the integrating sphere system 5, and the integrating sphere system 5 is used for generating 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 through the light path collimating system 6 to irradiate the DMD micro-mirror array 7; the DMD micromirror array 7 generates an analog target image. A lens assembly 8 is disposed between the DMD micromirror array 7 and the multiband camera 9; the DMD micro-mirror array 7 generates simulated target image light beams, the simulated target image light beams are projected on the multiband camera 9 through the lens assembly 8, 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 waveband range covers visible light and near infrared wavebands. The display and control cabinet 10 is respectively connected with the light source system 11, the DMD micro-mirror array 7 and the multiband camera 9, and the display and control cabinet 10 executes related control and display functions.
Referring to fig. 1, the following describes the parts of the device for simulating a multiband dynamic target based on DMD spatial light modulation technology:
the light source system 11 includes: an illumination 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, and 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 for adjusting the brightness of the light beam. In this embodiment, the illumination light source 2 is a high-power wide-spectrum hernia lamp 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 adjusted through the power supply. The grating monochromator 3 is used for light splitting in a composite waveband, the light splitting range is 400-2500nm, the resolution ratio is better than 10nm, the visible light and near infrared spectrum wavebands are covered, R232 serial port communication is adopted, and the light splitting waveband is adjusted through 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: 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 11; the outlets of the large integrating sphere and the small integrating sphere are arranged opposite to the light path collimation system 6. The small integrating sphere can reflect monochromatic light multiple times in the sphere, so that a uniform light spot is generated at the outlet. The small integral sphere body is formed by spinning an aluminum alloy material, butt welding spots are avoided, and higher precision is guaranteed; the inner wall of the ball is sprayed with a high-uniformity coating, so that the uniformity and the stability of an outlet are ensured; the small integrating sphere is designed to have double outlets, the outlet has the diameter of 200mm, the diameter of a small opening avoids the weak attenuation of emergent light, and the design of a follow-up light path is facilitated. The large integrating sphere can reflect the composite light for multiple times in the sphere, so that uniform light spots are generated at the outlet. The large integral sphere body is formed by spinning an aluminum alloy material, butt welding spots are avoided, and higher precision is guaranteed; the inner wall of the ball is sprayed with a high-uniformity coating, so that the uniformity and the stability of an outlet are ensured; the large integrating sphere also adopts a double-outlet design, and the outlet adopts a 500mm diameter, so that the design of a subsequent light path is facilitated.
The DMD micromirror array 7 consists of an optical head and a control circuit board, which is enclosed in a circuit box, and the optical head can be mounted on a flange ring and thus to other optical element holders. The circuit board is connected with a power adapter through a power line and can be connected with a 220V normal work, a high-speed data line is connected to an industrial personal computer through a USB, and loading and releasing of images are carried out through industrial personal computer software, and the resolution ratio is 1280 x 800.
The lens assembly 8 is an optical path assembly between the two optical systems of the DMD micro-mirror array 7 and the multiband camera 9, and the magnification of the lens assembly 8 is the ratio of the resolution of a 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 multi-band camera 9 is 400-.
The display and control cabinet 10 is used for controlling the lighting source 2 and the relevant software of the grating monochromator 3, generating required background light, developing a DMD chip, processing image data, generating corresponding image video data, performing different configuration operations on multiband camera 9 software, and testing the performance of the DMD.
The composite visible near-infrared illumination light source 2 is divided into a spectrum with a single wavelength required by the test by the grating monochromator 3, enters the large integrating sphere or the small integrating sphere, generates a uniform surface light source at an outlet, and the brightness of the light source is adjusted by the adjustable slit 4 of the grating monochromator 3. Because light emitted by the light source is very weak after passing through the monochromator and the integrating sphere and is not beneficial to imaging of a simulation target, the mode of two integrating spheres is adopted, the small integrating sphere is used for imaging monochromatic light, and the large integrating sphere is used for imaging composite light. The uniform area light source generates collimated uniform light through the light path collimation system 6 to irradiate the DMD micro-mirror array 7, a simulation target image is generated through micro-mirror overturning, and the simulation target can be projected on the target surface of the measured multiband camera 9 through the lens assembly 8, so that simulation of visible light and near infrared dynamic targets is achieved.
In order to further improve the simulation precision, a preferred embodiment provided by the invention is further provided with: a vibration isolation optical platform 1; the vibration isolation optical platform 1 is provided with a darkroom which is made of opaque acrylic materials. The vibration isolation optical platform 1 includes: top plate, bottom plate and steel honeycomb kernel. 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 a mounting hole for mounting and fixing various instruments and equipment. The light source system 11, the integrating sphere system 5, the light path collimation system 6, the DMD micro-mirror array 7, the lens assembly 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 operation of the multiband dynamic target simulation apparatus based on DMD spatial light modulation technology according to a specific embodiment:
the method comprises the following steps: and the lighting source 2, the grating monochromator 3, the adjustable slit 4, the small integrating sphere, the large integrating sphere, the DMD micro-mirror array 7, and a power line and a data transmission line of the multiband camera 9 are connected.
Step two: through the display and control cabinet 10, the power is turned on, the display is turned on, and the illumination light source 2 is preheated for one minute.
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 opening the upper computer software of the grating monochromator 3, and selecting a specific spectral range to enable monochromatic light of a corresponding waveband to enter the integrating sphere for reflection.
Step five: the working software of the DMD micro-mirror array 7 is opened, clicking initialization is carried out, the system automatically allocates DMD equipment which is in an idle state at present to an application program, and the equipment is initialized; clicking and loading, wherein the software loads an image with a preset pattern and corresponding resolution; the image can be projected by clicking the projection, and the frame frequency of the image can be changed by changing the refreshing frequency, so that the 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 waveband through the irradiation of the external light source, and the target simulation of different wavebands is realized;
step six: and opening the working software of the multiband camera 9, selecting the USB interface for transmission, and displaying the working interface of the host software.
Step seven: and adjusting the light path collimation system 6 and the lens assembly 8 to enable the integrating sphere or the emergent uniform light spot to irradiate on the DMD micro-mirror array 7, enabling the DMD micro-mirror array 7 to reflect light with different wave bands, and projecting a self-set pattern target onto the multi-wave-band camera 9 through the lens assembly 8.
Step eight: and adjusting the 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 the coordinates and the gray value of the image on a software interface. Thus, the present device completes one embodiment of multi-band dynamic object simulation.
The multiband dynamic target simulation device based on the DMD spatial light modulation technology provided by the invention at least has 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 arranged oppositely; the light source system emits light with a single wavelength to 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 through the light path collimation system to irradiate the DMD micro-mirror array; the DMD micromirror array generates an analog target image. The lens component is arranged between the DMD micro-mirror array and the multiband camera; the DMD micro-mirror array generates simulated target image light beams which are projected on the multi-band camera through the lens assembly, and the multi-band 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 problem that the existing simulation technology limits the characteristics and wave bands of imaging targets, realizes multiband dynamic target simulation of high frame frequency and patterns in any shapes, and has the wave band range of 400nm to 2500nm and covers visible light and near infrared. 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 (258Hz), full digital control, high stability and multiband.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A multiband dynamic target simulation device based on DMD spatial light modulation technology is characterized by comprising: the device comprises a light source system, an integrating sphere system, a light path collimation system, a DMD micro-mirror array, a lens assembly, a multi-band 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 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 collimation 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 multi-band camera; the DMD micro-mirror array generates simulated target image light beams which are projected on the multi-band camera through the lens assembly, and the multi-band 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.
2. The device according to claim 1, wherein the light source system comprises: an illumination light 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 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.
3. The device of claim 2, wherein the illumination light source is a high-power wide-spectrum hernia lamp light source with a spectral range of 240 nm and 2500 nm.
4. The device of claim 2, wherein the grating monochromator is used for composite band splitting, and the splitting range is 400-2500 nm.
5. The device according to claim 2, wherein the adjustable slit has a range of motion of 0-40 mm.
6. The device of claim 1, wherein the integrating sphere system comprises: a large integrating sphere and a small integrating sphere;
the inlets of the large integrating sphere and the small integrating sphere are opposite to the light source system; and the outlets of the large integrating sphere and the small integrating sphere are opposite to the light path collimation system.
7. The device of claim 1, wherein the magnification of the lens assembly is a ratio of a DMD chip resolution in a DMD micro-mirror array to a target surface resolution of the multiband camera.
8. The DMD spatial light modulation technology-based multiband dynamic target simulation device of claim 1, wherein the multiband camera employs an InGaAs detector; the detection band of the multi-band camera is 400-1700 nm.
9. The device according to any of claims 1-8, 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 inner 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 assembly, the multiband camera and the display and control cabinet are arranged on the top plate.
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| 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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