CN114488510B - Low-cost high-resolution active and passive single-pixel imaging optical-mechanical system - Google Patents
Low-cost high-resolution active and passive single-pixel imaging optical-mechanical system Download PDFInfo
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- CN114488510B CN114488510B CN202111601093.XA CN202111601093A CN114488510B CN 114488510 B CN114488510 B CN 114488510B CN 202111601093 A CN202111601093 A CN 202111601093A CN 114488510 B CN114488510 B CN 114488510B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 127
- 238000012545 processing Methods 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 238000005286 illumination Methods 0.000 claims abstract description 8
- RURPJGZXBHYNEM-UHFFFAOYSA-N 2-[2-[(2-hydroxyphenyl)methylideneamino]propyliminomethyl]phenol Chemical compound C=1C=CC=C(O)C=1C=NC(C)CN=CC1=CC=CC=C1O RURPJGZXBHYNEM-UHFFFAOYSA-N 0.000 claims description 13
- 238000012634 optical imaging Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
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- 239000011159 matrix material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/12—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
- G02B23/04—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors for the purpose of beam splitting or combining, e.g. fitted with eyepieces for more than one observer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/16—Housings; Caps; Mountings; Supports, e.g. with counterweight
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
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Abstract
A low-cost high-resolution active and passive single-pixel imaging optical-mechanical system comprises an imaging lens, a turntable, a transmitting part, a receiving part and a data processing system. The imaging lens uses a commercial astronomical telescope lens; the emitting part is used for respectively and stably fixing the laser and the emitting light path at the front end of the imaging lens in a mode of matching the fixing ring and the fixing frame, the laser beam is coaxial with the imaging lens and is emitted to a target after passing through two 45-degree reflecting mirrors on the emitting light path, illumination is provided by the laser during active imaging, illumination is provided by ambient light during passive imaging, and the laser is closed. The receiving portion is quickly mounted to the rear end of the imaging lens by threads on the interface nut. The invention solves the problems of high development cost, long period, complex system structure, additional period and cost increase of the development of functions such as pointing, focusing and the like of a customized high-resolution optical system for single-pixel imaging, and realizes the integrated imaging function of a main lens by assembling a single-pixel imaging optical-mechanical system on a commercial large-caliber astronomical telescope.
Description
Technical Field
The invention relates to a low-cost high-resolution active and passive single-pixel imaging optical-mechanical system, and belongs to the field of measurement.
Background
The single-pixel imaging (correlation imaging) is a new system imaging method, can solve the problem that some traditional imaging technologies cannot solve, does not directly image a target object, but irradiates the target by using a light field with correlation characteristics, performs correlation measurement to realize imaging, and can realize super-resolution imaging, has strong anti-interference capability and simple structure, and can theoretically realize a series of advantages of any wave band and the like. In order to image targets outside tens to hundreds kilometers in single pixel, a high-resolution imaging lens is needed, in the currently common scheme, most of methods are to use a high-resolution customized imaging lens, which has high cost and single function, but the currently commercial large-caliber astronomical telescope lens has very low price and perfect function because of scale production, so that if the commercial large-caliber astronomical telescope lens can be reformed and utilized to image single pixel, the cost can be greatly reduced, and based on a mature platform of the commercial astronomical telescope, more various functions can be realized, and the operation is more convenient and simple.
Disclosure of Invention
The invention aims at: the problems that the development cost is high, the period is long, the system structure is complex, the period and the cost are additionally increased due to the development of functions such as pointing and focusing, and the like of a customized high-resolution optical system for single-pixel imaging are solved, the scanning component is required by the existing laser radar three-dimensional imaging system, the system is complex, the cost is high, and the like are solved, the single-pixel imaging optical-mechanical system is assembled on a commercial large-caliber astronomical telescope, the main and quilt integrated imaging function is realized, the system cost is low, the structure is simple, and the functions are various.
The technical scheme adopted by the invention is as follows:
a low cost high resolution active-passive single pixel imaging opto-mechanical system comprising: the device comprises an imaging lens, a turntable, a transmitting part, a receiving part and a data processing system;
the imaging lens and the turntable comprise: the imaging lens turntable (1) is used for supporting and controlling the pointing direction of the imaging lens (2), and the imaging lens (2) is used for receiving target optical signal imaging;
the transmitting section includes: the laser fixing ring (3), the laser fixing frame (4), the laser (5), the emission light path fixing ring (6), the emission light path fixing frame (7), the emission light path fixing plate (8), the first 45-degree reflecting mirror (9) and the second 45-degree reflecting mirror (10);
the receiving section includes: the device comprises a mounting nut (11), an interface flange (12), a prism (13), a camera (14), a receiving light path mounting frame (15), a first switching structure (16), a second switching structure (17), a diaphragm (18), a first reflecting mirror (19), a second reflecting mirror (20), a first converging lens (21), a second converging lens (22), a first filter (23), a second filter (24), a first PMT (25), a second PMT (26), a DMD (27), a DMD driving circuit board (28), an inner shading shell (29) and an outer shading shell (30);
the data processing system includes: a high-speed data acquisition card (31) and a computer (32);
the annular part of the laser fixing ring (3) in the transmitting part is tightly sleeved on the imaging lens (2), and the extension parts at the two sides of the opening are downward and the extension arms at the two sides of the U-shaped laser fixing frame (4) are fixed in a matched manner through screws and nuts; the laser (5) is fixed on the bottom plate of the laser fixing frame (4), and the light outlet is positioned right below the axis of the imaging lens (2); the annular part of the transmitting light path fixing ring (6) is tightly sleeved on the imaging lens (2), the position of the annular part is closer to the front end of the imaging lens (2) than the position of the laser fixing ring (3), the extension parts at two sides of the opening of the transmitting light path fixing ring (6) are downward and are matched and fixed with the mounting hole at one end of the transmitting light path fixing frame (7) through screws and nuts; the emission light path fixing plate (8) is vertically fixed at one end of the emission light path fixing frame (7) beyond the front end face of the imaging lens (2), the first 45-degree reflecting mirror (9) and the second 45-degree reflecting mirror (10) are respectively fixed at the upper end and the lower end of the emission light path fixing plate (8), and the axis of a light outlet of the first 45-degree reflecting mirror (9) coincides with the axis of the imaging lens (2);
the receiving part is characterized in that an interface flange (12), a receiving light path mounting frame (15), a first switching structure (16) and a second switching structure (17) are combined and mounted to be used as a structural main body, a prism (13), a camera (14), a diaphragm (18), a first reflecting mirror (19), a second reflecting mirror (20), a first converging lens (21), a second converging lens (22), a first filter (23), a second filter (24), a first PMT (25), a second PMT (26), a DMD (27), a DMD driving circuit board (28) and an inner shading shell (29) are mounted on the structural main body to form a whole, the interface flange (12) and the receiving part are integrally fixed at the rear end of the main body of the imaging lens (2) through threads inside an interface nut (11) and a threaded interface at the rear part of the imaging lens (2), and the interface nut (11) and the rear part of the imaging lens (2) tightly clamp the bottom baffle at the middle;
the DMD (27) is a micromirror array which is arranged diagonally, the micromirror array which is arranged diagonally is used for making light signals enter the first PMT (25) and the second PMT (26) through a reflection light path, and the receiving part comprises an inner shading shell (29) and an outer shading shell (30);
the high-speed data acquisition card (31) in the data processing system is used for digitizing the analog photoelectric signals generated by the receiving part, and the computer (32) is used for processing and storing single-pixel signals input by the high-speed data acquisition card (31) and calculating and reconstructing a target image according to the digitized photoelectric signals.
Further, in the emission part, a first 45-degree mirror (9) and a second 45-degree mirror (10) fixed to an emission light path fixing plate (8) are matched, and laser beams from below the axis of the imaging lens (2) are adjusted to be coaxial with the imaging lens (2) and then emitted to a target.
Further, when the optical-mechanical system actively images, the emitting part actively provides laser illumination; ambient light is used in passive imaging, and the emissive portion does not provide laser illumination.
Further, in the internal light path of the receiving part, the light signal from the imaging lens (2) is firstly divided into two beams through the prism (13), one beam enters the camera (14), the direction of the imaging lens (2) is judged through traditional optical imaging, the other beam reaches the DMD (27) after passing through the diaphragm (18), the DMD (27) divides the light modulated into two beams, and the two beams enter the first PMT (25) and the second PMT (26) respectively after passing through the first reflector (19), the second reflector (20), the first converging lens (21), the second converging lens (22), the first filter (23) and the second filter (24) respectively, and finally the light signal is converted into an electric signal for processing of a subsequent data processing system.
Further, the receiving part structure and the optical element are integrated into a whole, the upper part of the interface nut (11) is provided with an opening, the opening can be sleeved into the interface flange (12) and blocked by a baffle at the bottom of the interface flange (12) to prevent the separation, after the whole assembly of the receiving part is completed, the interface nut (11) and the baffle at the bottom of the interface flange (12) are clamped in the middle through threads inside the interface nut (11) and a threaded interface at the rear part of the imaging lens (2), so that the interface flange (12) and the receiving part are integrally fixed, the gap between the bottom baffle of the interface flange (12) and the inner diameter of the interface nut (11) can relatively rotate when the interface flange (12) and the baffle at the bottom of the interface nut (11) are unfixed, and the position error of the receiving part after the fixing does not influence the light signal receiving of the imaging lens (2).
Furthermore, the receiving part uses a double-layer shading shell, the outer shading shell (30) is arranged at the rear part of the imaging lens (2) to shade the whole receiving part and is used for shielding external environment light, protecting the DMD (27) and a circuit and ensuring the internal environment to be stable during working; the outer shading shell (30) is also provided with a hole for a cable to pass through; an inner light shielding shell (29) is arranged on the receiving part and used for shielding the LED lamplight of the DMD drive circuit board (28) and stray light of the main light path and preventing the stray light from entering the inner light path.
Further, the first PMT (25) and the second PMT (26) are connected at 45 degrees with the horizontal plane, and the long side direction of the array surface of the DMD (27) is parallel with the ground horizontal plane.
Furthermore, the imaging lens and the turntable use a large-caliber Cassegrain astronomical telescope platform, and the caliber selection range of the telescope is 150-400mm.
Compared with the prior art, the invention has the advantages that:
(1) The single-pixel imaging optical-mechanical system is assembled on the commercial large-caliber Cassegrain astronomical telescope, so that the cost can be greatly reduced, a mature platform based on the commercial telescope can realize more various functions, the operation is more convenient and simple, and the Cassegrain astronomical telescope ensures that the imaging effect is not influenced by shielding of a front emission part of the lens;
(2) The emitting part uses a form of matching the annular fixing ring and the fixing frame to stably fix the laser (5) and the emitting light path system at the front end of the imaging lens (2), the laser beam in the emitting light path can synchronously move along with the pointing direction of the imaging lens (2), the structure is simple and the weight is light, no additional punching is needed on the imaging lens (2), and the annular fixing ring can be applied to all high-resolution imaging lenses with cylindrical lens barrels;
(3) The laser emission optical axis is coaxial with the imaging optical axis received by the optical system, so that the superposition of the irradiation view field and the imaging view field at different distances can be kept without adjusting the optical axis;
(4) During active imaging, the emitting part actively provides laser illumination; the environment light is used during passive imaging, the emitting part does not provide laser illumination, and the conversion operation of the active and passive imaging modes is simple and convenient;
(5) The integrated receiving part is installed in a threaded connection mode, can be quickly assembled and disassembled, and is simple and convenient to operate;
(6) The long side direction of the array surface of the DMD (27) is parallel to the ground horizontal plane, so that the design of a modulation matrix according to the geometric shape of the DMD (27) is facilitated, the resolving result is ensured to be directly an upright image, and elements such as a filter, an attenuation sheet, a converging lens and the like can be arranged in front of the PMT (25) and the PMT (26), so that the imaging effect is improved;
(7) The outer shading shell (30) is arranged at the rear part of the imaging lens (2) and can shade external environment light, protect the DMD (27) and a circuit, ensure the stable internal environment during working, and the outer shading shell (30) is also provided with holes for cables to pass through; the inner shading shell (29) can shade the LED lamplight of the DMD drive circuit board (28) and the stray light of the main light path, and prevent the stray light from entering the internal light path.
Drawings
FIG. 1 is a schematic diagram of a transmitting portion;
FIG. 2 is a schematic view of a receiving section;
FIG. 3 is a schematic view of a receiving section optical path;
FIG. 4 is a schematic view of a receiving portion shading, wherein (a) and (b) are schematic views of an inner and outer shading, respectively;
FIG. 5 is a schematic diagram of a data processing system;
fig. 6 is a general schematic diagram of an opto-mechanical system.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention discloses a low-cost high-resolution active and passive single-pixel imaging optical-mechanical system, as shown in fig. 1, 2, 3, 4 and 5, wherein fig. 1 is a schematic diagram of an emission part structure; FIG. 2 is a schematic view of a receiving section; FIG. 3 is a schematic view of a receiving section optical path; FIG. 4 is a schematic view of a receiving portion shading; FIG. 5 is a schematic diagram of a data processing system.
As shown in fig. 6, the present invention provides a low-cost high-resolution active-passive single-pixel imaging optical-mechanical system, which includes: the device comprises an imaging lens, a turntable, a transmitting part, a receiving part and a data processing system;
the imaging lens and the turntable use commercial large-caliber astronomical telescope platforms, and the star-shaped Telang CPC1100 is taken as an example, and the parameters are as follows: schmidt-cassegrain optical design, caliber 280mm, focal length 2800mm, focal ratio F10, maximum available multiple 661, RS232 communication port, manual controller or programming control imaging lens turntable 1 action, adjusting imaging lens 2 direction, knob focusing, multiple functions and convenient use. The imaging lens turntable 1 is mainly used for supporting and controlling the pointing direction of the imaging lens 2, the imaging lens 2 is mainly used for receiving a target optical signal for imaging, and a threaded interface for installing optical equipment is reserved at the rear part of the imaging lens 2;
1. transmitting part
The structure of the emitting part is schematically shown in fig. 1: the external diameter of the mounting emission part of the imaging lens 2 is 305mm, the laser fixing ring 3 in the emission part is circular, the internal diameter is 305mm, the external diameter is 311mm, the width is 50mm, an opening with the width of 205mm is reserved below, two sides of the opening are extended downwards, and the extending part is provided with 12 mounting holes for fixing the laser fixing frame 4. The whole laser fixing frame 4 is U-shaped, the length is 125mm, the width is 190mm, the height is 175mm, the laser 5 is fixed on the bottom plate of the laser fixing frame 4, the light outlet is positioned right below the axis of the imaging lens 2, 12 mounting holes are formed in two sides of the upper part of the laser fixing frame 4, and the mounting holes correspond to the hole sites on the laser fixing ring 3.
When the laser fixing ring 3 is installed, the laser fixing ring 3 is sleeved on the imaging lens 2, then the laser fixing ring 3 and the laser fixing frame 4 are connected and fixed through the installation holes by using the screws and the nuts, and the width of the laser fixing frame 4 is smaller than that of an opening of the laser fixing ring 3, so that when the laser fixing ring is connected and clamped by using the screws and the nuts, the upper side of the laser fixing frame 4 is stressed and expanded outwards, meanwhile, the opening part of the laser fixing ring 3 is stressed and contracted inwards, the whole laser fixing ring 3 is clamped and fastened on the imaging lens 2, and the fixing frame and parts on the fixing frame are connected with the fixing ring to achieve a fixing effect, so that the laser 5 is stably fixed at the front end of the imaging lens 2;
the emission light path retainer plate 6 is the ring shape, internal diameter 305mm, external diameter 311mm, wide 50mm, the below leaves 56mm wide opening, opening both sides extension, and the extension is total 6 mounting holes and is used for fixed emission light path mount 7, and emission light path mount 7 is long 200mm, wide 46mm, high 30mm, and one end both sides are total 6 mounting holes, with the cooperation installation of emission light path retainer plate 6, and other end one side has 4 mounting holes for install emission light path fixed plate 8 outside imaging lens 2 front end face, the fixed of emission light path is fixed same with laser instrument 5. If the volumes of the laser 5 and the emission light path are small enough, the laser 5 and the emission light path can be combined on a fixed frame, so that the whole structure is simpler;
the emission light path fixing plate 8 is fixed at one end of the emission light path fixing frame 7 beyond the front end face of the imaging lens 2, a 45-degree reflecting mirror 9 and a 45-degree reflecting mirror 10 with a certain adjusting range are fixed at the upper end and the lower end of the emission light path fixing plate 8, and the 45-degree reflecting mirror 9 and the 45-degree reflecting mirror 10 are adjusted to adjust the laser beam from the lower side of the imaging lens 2 to be coaxial with the imaging lens 2 and then emitted to a target.
2. Receiving part
Fig. 2 is a schematic diagram of the structure of the receiving section. The receiving part takes the combination of the interface flange 12, the receiving light path mounting frame 15, the switching structure 16 and the switching structure 17 as a structural main body, and the diaphragm 18, the reflecting mirror 19, the reflecting mirror 20, the converging lens 21, the converging lens 22, the filtering sheet 23, the filtering sheet 24, the PMT25, the PMT26, the DMD27, the DMD driving circuit board 28 and the inner shading shell 29 are arranged on the structural main body to form a whole, wherein the whole size is 289mm long, 141mm wide and 173mm high;
the external diameter of the upper part of the interface flange 12 is 56mm, the external diameter of the bottom baffle is 81mm, the internal diameter of the interface nut 11 is 82mm, threads matched with the threaded interface at the rear part of the imaging lens 2 are arranged, the upper part is provided with an opening with the diameter of 57mm, the interface nut 11 is sleeved into the interface flange 12 through the opening at the upper part before installation and is blocked by the baffle at the bottom of the interface flange 12 to prevent the separation, after the whole assembly of the receiving part is completed, the interface nut 11 and the baffle at the bottom of the imaging lens 2 are tightly clamped in the middle through the threads inside the interface nut 11 and the baffle at the rear part of the imaging lens 2, so that the interface flange 12 and the receiving part are integrally fixed, the gap between the bottom baffle of the interface flange 12 and the internal diameter of the interface nut 11 can be easily rotated relatively when the interface flange 12 and the internal diameter of the interface nut 11 are not fixed, and the position error of the receiving part after the fixing does not influence the optical signal receiving of the imaging lens 2.
3. Receiving part of the optical path
As shown in fig. 3, a schematic view of a light path of a receiving portion is shown, in an internal light path of the receiving portion, an optical signal from an imaging lens 2 is first divided into two beams by a prism 13, one beam enters a camera 14, the direction of the imaging lens 2 is judged by conventional optical imaging, the other beam reaches a DMD27 after passing through a diaphragm 18, the DMD27 divides the light modulated into two beams, and the two beams enter a first PMT25 and a second PMT26 after passing through a first reflective mirror 19, a second reflective mirror 20, a first converging lens 21, a second converging lens 22, a first filter 23 and a second filter 24 respectively, and finally the optical signal is converted into an electrical signal for processing by a subsequent data processing system;
the DMD27 (digital micro-mirror device) adopts DLP7000 series of texas instruments, 1024×768 aluminum micro-level diagonal arranged micro mirror arrays, the connecting line of PMT25 and PMT26 forms 45 degrees with the horizontal plane, the long side direction of the array surface of the DMD27 is parallel with the ground horizontal plane, the design of the modulation matrix according to the geometric shape of the DMD27 is facilitated, the resolving result is ensured to be directly an upright image, the micro mirror arrays diagonally arranged in the DMD27 are used for making light signals incident into PMT25 and PMT26 forming 45 degrees with the horizontal plane through the reflection light path, and the front of PMT25 and PMT26 can be provided with elements such as a filter, an attenuation sheet, a converging lens and the like, so that the imaging effect is improved. PMT: photomultiplier tube (photon multiplier tube).
4. The receiving part is shielded from light
Fig. 4 shows a schematic diagram of a light path of the receiving portion: the receiving part uses a double-layer shading shell, the outer shading shell 30 is arranged at the rear part of the imaging lens 2 and mainly used for shading external environment light, protecting the DMD27 and a circuit, ensuring stable internal environment during working, and a hole for a cable to pass through is formed in the outer shading shell 30; the inner shielding shell 29 mainly shields the LED light of the DMD driving circuit board 28 and stray light of the main light path, and prevents stray light from entering the internal light path.
5. Data processing system
FIG. 5 is a schematic diagram of a data processing system: the data processing system comprises a high-speed data acquisition card 31 for digitizing the analog photoelectric signals generated by the receiving part, and a computer 32 for processing and storing the single pixel signals input by the high-speed data acquisition card 31 and reconstructing the target image by algorithm calculation according to the digitized photoelectric signals.
The invention solves the problems of high development cost, long period, complex system structure, additional period and cost increase in the development of functions such as pointing, focusing and the like of a customized high-resolution optical system for single-pixel imaging, and the single-pixel imaging optical-mechanical system is assembled on a commercial large-caliber astronomical telescope to realize the integrated imaging function of a main lens and a lens, and has the advantages of low system cost, simple structure and multiple functions.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Claims (8)
1. A low cost high resolution active and passive single pixel imaging optomechanical system comprising: the device comprises an imaging lens, a turntable, a transmitting part, a receiving part and a data processing system;
the imaging lens and the turntable comprise: the imaging lens turntable (1) is used for supporting and controlling the pointing direction of the imaging lens (2), and the imaging lens (2) is used for receiving target optical signal imaging;
the transmitting section includes: the laser fixing ring (3), the laser fixing frame (4), the laser (5), the emission light path fixing ring (6), the emission light path fixing frame (7), the emission light path fixing plate (8), the first 45-degree reflecting mirror (9) and the second 45-degree reflecting mirror (10);
the receiving section includes: the device comprises a mounting nut (11), an interface flange (12), a prism (13), a camera (14), a receiving light path mounting frame (15), a first switching structure (16), a second switching structure (17), a diaphragm (18), a first reflecting mirror (19), a second reflecting mirror (20), a first converging lens (21), a second converging lens (22), a first filter (23), a second filter (24), a first PMT (25), a second PMT (26), a DMD (27), a DMD driving circuit board (28), an inner shading shell (29) and an outer shading shell (30);
the data processing system includes: a high-speed data acquisition card (31) and a computer (32);
the annular part of the laser fixing ring (3) in the transmitting part is tightly sleeved on the imaging lens (2), and the extension parts at the two sides of the opening are downward and the extension arms at the two sides of the U-shaped laser fixing frame (4) are fixed in a matched manner through screws and nuts; the laser (5) is fixed on the bottom plate of the laser fixing frame (4), and the light outlet is positioned right below the axis of the imaging lens (2); the annular part of the transmitting light path fixing ring (6) is tightly sleeved on the imaging lens (2), the position of the annular part is closer to the front end of the imaging lens (2) than the position of the laser fixing ring (3), the extension parts at two sides of the opening of the transmitting light path fixing ring (6) are downward and are matched and fixed with the mounting hole at one end of the transmitting light path fixing frame (7) through screws and nuts; the emission light path fixing plate (8) is vertically fixed at one end of the emission light path fixing frame (7) beyond the front end face of the imaging lens (2), the first 45-degree reflecting mirror (9) and the second 45-degree reflecting mirror (10) are respectively fixed at the upper end and the lower end of the emission light path fixing plate (8), and the axis of a light outlet of the first 45-degree reflecting mirror (9) coincides with the axis of the imaging lens (2);
the receiving part is formed by combining and installing an interface flange (12), a receiving light path mounting frame (15), a first switching structure (16) and a second switching structure (17) to be used as a structural main body, a prism (13), a camera (14), a diaphragm (18), a first reflecting mirror (19), a second reflecting mirror (20), a first converging lens (21), a second converging lens (22), a first filter (23), a second filter (24), a first PMT (25), a second PMT (26), a DMD (27), a DMD driving circuit board (28) and an inner shading shell (29) on the structural main body to form a whole, and the interface flange (12) and the receiving part are integrally fixed at the rear end of the main body of the imaging lens (2) by quickly installing threads inside an installing nut (11) and a threaded interface at the rear part of the imaging lens (2), and the installing nut (11) and the rear part of the imaging lens (2) tightly clamp the bottom baffle at the middle;
the DMD (27) is a micromirror array which is arranged diagonally, the micromirror array which is arranged diagonally is used for making light signals enter the first PMT (25) and the second PMT (26) through a reflection light path, and the receiving part comprises an inner shading shell (29) and an outer shading shell (30);
the high-speed data acquisition card (31) in the data processing system is used for digitizing the analog photoelectric signals generated by the receiving part, and the computer (32) is used for processing and storing single-pixel signals input by the high-speed data acquisition card (31) and calculating and reconstructing a target image according to the digitized photoelectric signals.
2. The low cost high resolution active-passive single pixel imaging optomechanical system of claim 1, wherein: in the emitting part, a first 45-degree reflecting mirror (9) and a second 45-degree reflecting mirror (10) fixed on an emitting light path fixing plate (8) are matched, and laser beams from below the axis of an imaging lens (2) are adjusted to be coaxial with the imaging lens (2) and then emitted to a target.
3. The low cost high resolution active-passive single pixel imaging optomechanical system of claim 1, wherein: when the optical mechanical system actively images, the emitting part actively provides laser illumination; ambient light is used in passive imaging, and the emissive portion does not provide laser illumination.
4. The low cost high resolution active-passive single pixel imaging optomechanical system of claim 1, wherein: in the internal light path of the receiving part, the light signal from the imaging lens (2) is firstly divided into two beams through the prism (13), one beam enters the camera (14), the direction of the imaging lens (2) is judged through traditional optical imaging, the other beam reaches the DMD (27) after passing through the diaphragm (18), the DMD (27) divides the light modulated into two beams, and the two beams enter the first PMT (25) and the second PMT (26) respectively after passing through the first reflecting mirror (19), the second reflecting mirror (20), the first converging lens (21), the second converging lens (22), the first filter (23) and the second filter (24) respectively, and finally the light signal is converted into an electric signal for processing of a subsequent data processing system.
5. The low cost high resolution active and passive single pixel imaging optomechanical system of claim 4, wherein: the receiving part structure is integrated with the optical element, the upper part of the interface nut (11) is provided with an opening, the opening can be sleeved into the interface flange (12), the opening is blocked by a baffle at the bottom of the interface flange (12) to prevent the opening from falling out, after the whole assembly of the receiving part is finished, the interface nut (11) and the baffle at the bottom of the interface flange (12) are clamped in the middle through threads inside the interface nut (11) and a threaded interface at the rear part of the imaging lens (2), so that the interface flange (12) and the receiving part are integrally fixed, the gap between the bottom baffle of the interface flange (12) and the inner diameter of the interface nut (11) can relatively rotate when the interface flange (12) and the baffle at the bottom of the interface nut (11) are unfixed, and the position error of the receiving part after the fixing does not influence the light signal receiving of the imaging lens (2).
6. The low cost high resolution active-passive single pixel imaging optomechanical system of claim 1, wherein: the receiving part uses a double-layer shading shell, the outer shading shell (30) is arranged at the rear part of the imaging lens (2) to shade the whole receiving part, and is used for shading external environment light, protecting the DMD (27) and a circuit and ensuring the internal environment to be stable during working; the outer shading shell (30) is also provided with a hole for a cable to pass through; an inner light shielding shell (29) is arranged on the receiving part and used for shielding the LED lamplight of the DMD drive circuit board (28) and stray light of the main light path and preventing the stray light from entering the inner light path.
7. The low cost high resolution active-passive single pixel imaging optomechanical system of claim 1, wherein: the first PMT (25) and the second PMT (26) are connected at 45 degrees with the horizontal plane, and the long side direction of the array surface of the DMD (27) is parallel with the ground horizontal plane.
8. The low cost high resolution active-passive single pixel imaging optomechanical system of claim 1, wherein: the imaging lens and the turntable use large-caliber Cassegrain astronomical telescope platforms, and the caliber selection range of the telescope is 150-400mm.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106483530A (en) * | 2016-08-31 | 2017-03-08 | 中国科学院光电技术研究所 | Inverse synthetic aperture laser radar system based on reflective astronomical telescope |
| CN108051908A (en) * | 2017-12-01 | 2018-05-18 | 中国科学院长春光学精密机械与物理研究所 | A kind of imaging optical system |
| CN108267863A (en) * | 2018-01-04 | 2018-07-10 | 中国空空导弹研究院 | A kind of compact super-resolution imaging optical system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106483530A (en) * | 2016-08-31 | 2017-03-08 | 中国科学院光电技术研究所 | Inverse synthetic aperture laser radar system based on reflective astronomical telescope |
| CN108051908A (en) * | 2017-12-01 | 2018-05-18 | 中国科学院长春光学精密机械与物理研究所 | A kind of imaging optical system |
| CN108267863A (en) * | 2018-01-04 | 2018-07-10 | 中国空空导弹研究院 | A kind of compact super-resolution imaging optical system |
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