Optical device for common aperture transmitting and receiving laser ranging in optoelectronic system

Abstract

The present invention provides a photoelectric system common aperture transmitting and receiving laser ranging optical device, comprising a laser ranging unit; a photoelectric system main device, arranged on one side of the laser ranging unit; a dichroic mirror, arranged on one side of the laser ranging unit and the photoelectric system main device, and the dichroic mirror couples the ranging laser into the main optical path of the photoelectric system main device to complete the common aperture transmission and reception of the ranging laser and the main optical path of the photoelectric system; a transmitting and receiving telescope, arranged on one side of the dichroic mirror. The large-caliber transmitting and receiving antenna of the photoelectric system is effectively utilized, and the ability to collect the return light of the long-distance target is strong. Combined with the characteristics of spectral filtering, spatial filtering, and time-varying optical gain, the common aperture laser ranging system faces the problem of internal optical path stray light interference and short-range atmospheric backscattered light interference. The blind area is small, the detection distance is long, the structure is compact, and the volume and weight of the photoelectric system are effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of laser emission and reception of an optoelectronic system, and in particular to an optical device for common aperture emission and reception of laser ranging in an optoelectronic system. Background Art

[0002] In laser application optoelectronic systems such as laser space communication, laser deicing, laser countermeasures against low, slow and small aerial targets, laser removal of space debris, laser space energy supply, etc., it is necessary to obtain target distance information to meet the optoelectronic system's focusing and control requirements during target imaging, detection, tracking, aiming, laser emission, etc.

[0003] At present, the main technical approach used for laser ranging in optoelectronic systems is the split-aperture method with optoelectronic systems, that is, the laser ranging system uses a separate antenna (telescope) system for transmission and reception, which is separated from the main optical path transmitting antenna of the optoelectronic system. The advantage is that the ranging system does not interfere with the lasers and detectors used in other optoelectronic systems, and the signal is stable and clean; the problem caused by this is that the total volume and weight of the system are increased. Some carrying platforms (such as aircraft, satellites, etc.) are limited by the load capacity and the available space, and may not have sufficient conditions to install a separate split-aperture laser ranging system. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the present invention provides an optoelectronic system common aperture transmitting and receiving laser ranging optical device.

[0006] The present invention provides an optoelectronic system common aperture transmitting and receiving laser ranging optical device, comprising:

[0007] Laser ranging unit;

[0008] The main device of the optoelectronic system is arranged on one side of the laser ranging unit;

[0009] A dichroic mirror is arranged on one side of the laser ranging unit and the optoelectronic system main device, and the dichroic mirror couples the ranging laser into the main optical path of the optoelectronic system main device to complete the common aperture transmission and reception of the ranging laser and the optoelectronic system main optical path;

[0010] The transmitting and receiving telescope is arranged on one side of the dichroic mirror and serves as a transmitting and receiving antenna used by the main equipment of the optoelectronic system and the ranging laser.

[0011] The optoelectronic system common aperture transmitting and receiving laser ranging optical device according to the above technical solution of the present invention may also have the following additional technical features:

[0012] In the above technical solution, the laser ranging unit includes:

[0013] A ranging laser to generate and emit pulsed laser light;

[0014] The transmitting and receiving hole-digging mirrors correspond to the transmitting port position of the ranging laser, so that the pulsed laser beam is emitted through the hole and the ranging return light is reflected into the ranging receiving optical path;

[0015] An objective lens group is arranged on one side of the transmitting and receiving hole-digging mirrors to focus the range-finding return light beam;

[0016] A reflector, disposed on one side of the objective lens group, to deflect the light path;

[0017] A turntable is arranged on the reflection path of the reflector, wherein the spot diameter of the ranging return light beam at the turntable can be changed by adjusting the distance from the turntable to the focus of the objective lens group;

[0018] A pinhole diaphragm is set on the reflection path of the light beam to transmit the distance measurement return light and block the stray light outside the field of view;

[0019] A focusing and filtering lens group is arranged on one side of the pinhole diaphragm and corresponds to the position of the pinhole diaphragm;

[0020] The distance measuring detector is arranged on one side of the focusing and filtering lens group and corresponds to its position to convert the distance measuring return light into an electrical signal.

[0021] In the above technical solution, the turntable is composed of a turntable plate, and a shaft hole is formed at the center of the turntable plate, a timing synchronization groove is formed on the circumferential side wall of the turntable plate; and a light-transmitting groove is formed along the circumference of the turntable plate.

[0022] In the above technical solution, the number of the timing synchronization slots and the light-transmitting slots is n, and n is a positive integer.

[0023] In the above technical solution, the rotating shaft hole is used to connect with the rotating shaft of the motor.

[0024] In the above technical solution, a timing synchronization unit is also included, which includes a photoelectric tube and an electronic control device for detecting the arrival time of the timing synchronization slot of the turntable, and triggering the ranging laser to generate and emit laser after a delay.

[0025] In the above technical solution, the focusing and filtering lens group includes lens 1, a narrow-band filter and lens 2;

[0026] Wherein, the lens 1 is a collimating lens composed of one or more lenses, which collimates the ranging light passing through the pinhole aperture into parallel light and transmits it to the narrow-band filter;

[0027] The narrow-band filter is a narrow-band interference filter made of an interference filter film plated on a glass substrate, which is used for spectral filtering, has high transmission for the wavelength of ranging light, and absorbs or reflects other wavelengths;

[0028] The second lens is a focusing lens composed of one or more lenses, which refocuses the ranging return light onto the photosensitive surface of the ranging detector.

[0029] In the above technical solution, the distance measuring laser is a short pulse solid laser or a semiconductor laser; and / or

[0030] The transmitting and receiving hole-punched mirrors are reflectors made of glass or metal materials. There are holes on the mirrors corresponding to the positions of the emitted laser beams. The diameter of the holes is slightly larger than the diameter of the laser beams, so that the laser beams emitted by the ranging lasers are emitted through the holes. The surface of the mirrors is coated with a high-reflective film of the ranging wavelength, which reflects the ranging return light into the ranging receiving optical path objective lens group.

[0031] In the above technical solution, the objective lens group is a focusing objective lens composed of a single lens or multiple lenses, which eliminates aberrations of the ranging light wavelength and is coated with an anti-reflection film, and is used to focus the ranging return light; and / or

[0032] The reflector is made of metal or glass and coated with a high-reflection film of the wavelength of the ranging light, and is used for turning the light path.

[0033] In the above technical solution, the pinhole aperture is an aperture made of an opaque material, the diameter of the pinhole is slightly larger than the diameter of the focal spot of the ranging return light, and is used to transmit the focused spot of the ranging return light to block stray light outside the field of view; and / or

[0034] The distance measuring detector is an avalanche photodiode or other high-sensitivity photodetector, which is used to convert the distance measuring return light into an electrical signal.

[0035] Compared with the prior art, the optoelectronic system common aperture transmitting and receiving laser ranging optical device proposed by the present invention has the following beneficial effects:

[0036] The same optical path and antenna (telescope) with the main optical path of the optoelectronic system is used to transmit and receive laser ranging signals, effectively utilizing the large-aperture transmitting and receiving antenna of the optoelectronic system, with strong ability to collect return light from distant targets. Combined with the characteristics of spectral filtering, spatial filtering, and time-varying optical gain, it solves the problems of internal optical path stray light interference and short-range atmospheric backscattered light interference faced by the common aperture laser ranging system. It has a small blind area, a long detection distance, and a compact structure, effectively reducing the size and weight of the optoelectronic system.

[0037] The ranging laser is coupled to the main optical path of the optoelectronic system through a dichroic mirror, so as to realize the transmission and reception of the same optical path and aperture as the optoelectronic system, and make full use of the strong weak light collection ability of the large-aperture telescope of the optoelectronic system for distant targets.

[0038] Use a hole-digging mirror as a laser ranging coupling spectrometer to achieve common aperture laser transmission / reception;

[0039] In the optical system of the ranging receiving light path, a pinhole aperture is set for spatial filtering, and a narrow-band filter is used for spectral filtering. A turntable with light-transmitting slots and timing synchronization slots is set in the receiving light path to control the timing optical gain in the short-range light path, prevent the strong reflected light of close-range targets from causing saturation or damage to the detector, reduce the interference of stray light in the internal light path and short-range atmospheric backscattered light, reduce short-range blind spots, improve long-range ranging capabilities, and effectively reduce the volume and weight of the optoelectronic system.

[0040] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] Figure 1 It is a light path layout diagram of the common aperture transmitting and receiving laser ranging optical device of the optoelectronic system of the present invention;

[0043] Figure 2 yes Figure 1 Layout diagram of the laser ranging unit;

[0044] Figure 3 yes Figure 1 The structural diagram of the middle turntable;

[0045] Figure 4 It is a schematic diagram of the turntable timing and optical path gain changes;

[0046] Figure 5 yes Figure 1 Schematic diagram of the focusing and filtering lens group.

[0047] in, Figures 1 to 5 The corresponding relationship between the reference numerals and the component names is as follows:

[0048] 1. Laser distance measuring unit; 11. Distance measuring laser; 12. Transmitting and receiving hole mirrors; 13. Objective lens group; 14. Reflector;

[0049] 15. Turntable; 151. Turntable plate; 152. Rotating shaft hole; 153. Timing synchronization slot; 154. Light transmission slot; 155. Distance measurement return light spot;

[0050] 16. Pinhole diaphragm;

[0051] 17. Focusing and filtering lens group; 171. Lens 1; 172. Narrow-band filter; 173. Lens 2;

[0052] 18. Distance measuring detector; 19. Motor; 20. Timing synchronization unit;

[0053] 2. Color dichroic mirror; 3. Main equipment of the optoelectronic system; 4. Transmitting and receiving telescopes. DETAILED DESCRIPTION

[0054] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0055] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0056] Refer to the following Figures 1 to 5 The following describes an optoelectronic system common aperture transmitting and receiving laser ranging optical device provided according to some embodiments of the present invention.

[0057] Some embodiments of the present application provide an optoelectronic system common aperture transmitting and receiving laser ranging optical device.

[0058] like Figures 1 to 5 As shown, one embodiment of the present invention provides an optoelectronic system common aperture transmitting and receiving laser ranging optical device, and its optical path layout is as follows Figure 1 As shown, it is composed of a laser ranging unit 1, a dichroic mirror 2, an optoelectronic system main device 3, and a transmitting and receiving telescope 4. The ranging laser is coupled to the main optical path of the optoelectronic system through the dichroic mirror, so that the ranging laser and the optoelectronic system can be transmitted and received in the same optical path and aperture, making full use of the strong weak light collection ability of the large-aperture telescope of the optoelectronic system for distant targets, improving the long-range ranging capability, and effectively reducing the volume and weight of the optoelectronic system.

[0059] In this embodiment, the dichroic mirror 2 is an optical glass plate polished on both sides, the front surface is coated with a dichroic film, which has high transmittance to the wavelength of the ranging laser and high reflectivity to the wavelength of light used by the optoelectronic system main device 3; the rear surface is coated with an anti-reflection film of the wavelength of the ranging laser.

[0060] In this embodiment, the optoelectronic system main device 3 is the main device for the optoelectronic system to realize the required functions. It is designed according to the specific task requirements of the optoelectronic system, such as target detection tracker, main laser, adaptive optical unit, etc., and has corresponding task function modules.

[0061] In this embodiment, the transmitting and receiving telescope 4 is a transmitting and receiving antenna used by the optoelectronic system and the ranging laser. The optical path lens is coated with a high reflective film layer for the wavelength used by the optoelectronic system and the ranging wavelength, and has a high transmission efficiency for the ranging laser.

[0062] Specifically, Figure 2 As shown, the laser ranging unit 1 includes a ranging laser 11, a transmitting and receiving hole mirror 12, an objective lens group 13, a reflector 14, a turntable 15, a pinhole aperture 16, a focusing and filtering lens group 17, a ranging detector 18, a motor 19, and a timing synchronization unit 20.

[0063] The laser ranging unit 1 uses the mature and widely used time-of-flight method to measure the distance, that is, by measuring the flight time of the pulsed laser emitted by the laser and reflected by the target back to the detector, and combining the transmission speed of light to obtain the target distance. A hole-digging mirror is used as a ranging laser coupling spectrometer to realize common aperture laser emission / reception.

[0064] Among them, in the ranging receiving optical system, a pinhole aperture 16 is set for spatial filtering, a narrow-band filter is used for spectral filtering, and a turntable with a light-transmitting slot and a timing synchronization slot is set in the receiving optical path to control the timing optical gain in the short-range optical path, prevent the strong reflected light of the close-range target from causing saturation or damage to the detector, reduce the interference of stray light in the internal optical path and short-range atmospheric backscattered light, reduce the short-range blind area, and improve the long-range ranging capability.

[0065] The ranging laser 11 is a short pulse solid laser or semiconductor laser, which is used to generate and emit the pulse laser required by the laser ranging device. The typical pulse width is in the order of ns, the pulse energy is in the order of mJ to J, and the pulse repetition period is determined by the specific task requirements, and the typical value can be several Hz to several kHz.

[0066] Among them, the transmitting and receiving hole mirror 12 is a reflector made of glass or metal material. There is a hole on the lens corresponding to the position of the emitted laser beam, so that the laser beam emitted by the ranging laser 11 is emitted through the hole; the surface of the lens is coated with a high-reflective film of the ranging laser wavelength, so that the ranging return light is reflected into the ranging receiving optical path.

[0067] The objective lens group 13 is a focusing objective lens composed of a single lens or multiple lenses, which eliminates aberrations of the wavelength of the ranging light and is coated with an anti-reflection film, and is used to focus the ranging return light.

[0068] The reflector 14 is made of metal or glass and coated with a high-reflection film of the wavelength of the ranging light, and is used to deflect the light path, reduce the system size, and achieve a compact design.

[0069] Among them, Figure 3As shown, the turntable 15 is a turntable plate 151 made of a light and high-rigidity material such as aluminum alloy, silicon carbide, carbon fiber, etc., and is formed with a shaft hole 152, a timing synchronization groove 153, and a light-transmitting groove 154.

[0070] Specifically, the turntable plate 151 may be symmetrically provided with n (n is a positive integer) periods of timing synchronization grooves 153 and light-transmitting grooves 154 along the circumference. Figure 3 As shown, in this embodiment, n=2. The spot diameter of the ranging return light beam at the rotating disk can be changed by adjusting the distance from the rotating disk 151 to the focus of the objective lens group 13.

[0071] In addition, the shaft hole 152 is a mounting hole for connecting the turntable 151 to the shaft of the motor 19 .

[0072] In addition, the timing synchronization slot 153 is used by the timing synchronization unit 20 to detect the zero point position during the rotation of the turntable 151, control the laser emission and return light signal detection timing, and control the optical gain of the laser ranging unit 1 for short-range return light.

[0073] In addition, the light-transmitting slot 154 is a long slot-shaped hole along the circumferential direction, the width of the slot is slightly larger than the diameter of the ranging return light spot, and the length of the slot is designed according to the timing requirements of the task system.

[0074] like Figure 4 As shown, the time-sequential optical gain of the turntable 15 is described in detail as follows:

[0075] At time t0, the front edge of the turntable light-transmitting slot 154 rotates to a position tangent to the ranging return light spot 155, blocking the return light path, triggering the ranging laser 11 to generate a pulsed laser, which enters the main optical path of the optoelectronic system and the transmitting and receiving telescopes through the hole mirror 12 and the dichroic mirror 2, but at this time, the reflected and scattered light in the internal optical path is blocked by the turntable and cannot enter the detector, preventing the detector from being interfered with or damaged;

[0076] At time t0-t1, the ranging return light spot 155 reflected from the close-range target is partially blocked by the turntable plate 151, and partially passes through the light-transmitting groove 154. The ranging return light spots 155 of targets at different distances arrive at the turntable at different times, and the proportion of the light spot area passed by the turntable light-transmitting groove 154 to the total light spot area is different. The return light of the closer target passes through the light-transmitting groove 154 less, and the proportion of the return light at a longer distance is higher.

[0077] The return light from time t1 to time t2 is completely transmitted by the light-transmitting groove.

[0078] The above process realizes that the laser ranging unit 1 has different optical gains at different distances. The internal optical path reflection and scattered stray light at the laser triggering time t0 are completely blocked by the turntable. After the pulse laser is emitted through the telescope, the optical gain of the return light of the close-range target is small during t0-t1, and the optical gain of the return light of the long-range target is large, which prevents the damage or saturation of the detector caused by the strong light returned from the close distance, effectively eliminates or reduces the damage or interference of the stray light of the internal optical path and the short-range atmospheric backscattered light to the ranging detector, which is conducive to reducing the short-range blind area of ​​laser ranging and improving the long-range ranging capability.

[0079] The ranging is stopped during t2-t3 to prepare for the next ranging pulse cycle;

[0080] At time t3, the next ranging pulse cycle begins.

[0081] Among them, t2 is the return light moment corresponding to the farthest detection distance of the laser ranging unit.

[0082] In addition, under typical circumstances: the duration from t0 to t1 is on the order of 1 microsecond to 100 microseconds, and the duration from t0 to t2 is on the order of 1 millisecond to 100 milliseconds, which can be designed according to task requirements.

[0083] In this embodiment, the pinhole aperture 16 is an aperture made of opaque material, and the diameter of the pinhole is slightly larger than the focal spot diameter of the ranging return light. It is used to transmit the ranging return light and block stray light outside the field of view, thus having a spatial filtering effect.

[0084] In this embodiment, if Figure 5 As shown, the focusing and filtering lens group 17 includes lens 1 171, a narrow-band filter 172, and lens 2 173, which are used to relay the ranging light spot passing through the pinhole aperture 16 to the photosensitive surface of the ranging detector 18, and perform spectral filtering on stray light other than the ranging wavelength.

[0085] Among them, lens one 171 is a collimating lens composed of one or more lenses, which collimates the ranging light passing through the pinhole aperture 16 into parallel light; the narrow-band filter 172 is a narrow-band interference filter made of an interference filter film plated on a glass substrate, which is used for spectral filtering, has high transmittance for ranging wavelength light, and absorbs or reflects other wavelengths of light; lens two 173 is a focusing lens composed of one or more lenses, which refocuses the ranging return light onto the photosensitive surface of the ranging detector 18.

[0086] In this embodiment, the distance measuring detector 18 is an avalanche photodiode or other high-sensitivity photodetector, which is used to convert the distance measuring return light into an electrical signal.

[0087] In this embodiment, the motor 19 is used to drive the turntable 15 to rotate, thereby realizing the optical gain timing control.

[0088] In this embodiment, the timing synchronization unit 20 includes a photoelectric tube and an electronic control device, which is used to detect the arrival time of the turntable timing synchronization slot 153 and trigger the ranging laser 11 to generate and emit laser after a delay.

[0089] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0090] Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optoelectronic system common aperture transmitting and receiving laser ranging optical device, characterized in that: include: Laser ranging unit (1); An optoelectronic system main device (3) is arranged on one side of the laser ranging unit (1); The dichroic mirror (2) is arranged on one side of the laser distance measuring unit (1) and the photoelectric system main device (3), and the dichroic mirror (2) couples the distance measuring laser into the main optical path of the photoelectric system main device (3) to complete the common aperture transmission and reception of the distance measuring laser and the main optical path of the photoelectric system; the dichroic mirror (2) is an optical glass plate polished on both sides, and a dichroic film is coated on the front surface; A transmitting and receiving telescope (4), which is arranged on one side of the dichroic mirror (2) and serves as a transmitting and receiving antenna used by the optoelectronic system main device (3) and the ranging laser; The laser distance measuring unit (1) comprises: A ranging laser (11) for generating and emitting a pulsed laser; The transmitting and receiving hole-digging mirror (12) corresponds to the position of the transmitting port of the distance measuring laser (11), so that the pulsed laser beam is emitted through the hole and the distance measuring return light is reflected into the distance measuring receiving optical path; An objective lens group (13) is arranged on one side of the transmitting and receiving hole-digging mirrors (12) to focus the range-finding return light beam; A reflector (14) is arranged on one side of the objective lens group (13) to deflect the light path; A turntable (15) is arranged on a reflection path of the reflector (14), wherein the spot diameter of the ranging return light beam at the turntable (15) can be changed by adjusting the distance from the turntable (15) to the focal point of the objective lens group (13); A pinhole diaphragm (16) is arranged on the reflection path of the light beam to transmit the distance measurement return light and block stray light outside the field of view; A focusing and filtering lens group (17), arranged on one side of the pinhole diaphragm (16) and corresponding to the position of the pinhole diaphragm (16); A distance measuring detector (18) is arranged on one side of the focusing and filtering lens group (17) and corresponds to its position to convert the distance measuring return light into an electrical signal; The turntable (15) is composed of a turntable plate (151), and a rotation shaft hole (152) is formed at the center of the turntable plate (151); a timing synchronization groove (153) is formed on the circumferential side wall of the turntable plate (151); and a light-transmitting groove (154) is formed along the circumference of the turntable plate (151); The front edge of the light-transmitting groove (154) rotates to a position tangent to the ranging return light spot (155), blocking the return light path, triggering the ranging laser (11) to generate a pulsed laser, which enters the main light path of the optoelectronic system main device (3) and the transmitting and receiving telescope (4) through the transmitting and receiving hole mirror (12) and the dichroic mirror (2) and is emitted. At this time, the reflected and scattered light in the internal light path is blocked by the turntable (151) and cannot enter the ranging detector (18); the ranging return light spot (155) reflected from the close-range target is partially blocked by the turntable (151) and partially transmitted through the light-transmitting groove (154); the ranging return light spots (155) of targets at different distances arrive at the turntable (15) at different times, and the proportion of the light spot area transmitted by the light-transmitting groove (154) to the total light spot area is different.

2. The optoelectronic system common aperture transmitting and receiving laser ranging optical device according to claim 1, characterized in that: The number of the timing synchronization slots (153) and the light-transmitting slots (154) is n, and n is a positive integer.

3. The optoelectronic system common aperture transmitting and receiving laser ranging optical device according to claim 2, characterized in that: The rotating shaft hole (152) is used to be connected to the rotating shaft of the motor (19).

4. The optoelectronic system common aperture transmitting and receiving laser ranging optical device according to claim 3, characterized in that: It also includes a timing synchronization unit (20), which includes a photoelectric tube and an electric control device, and is used to detect the arrival time of the timing synchronization slot (153) of the turntable (15), and trigger the distance measuring laser (11) to generate and emit laser after a delay.

5. The optoelectronic system common aperture transmitting and receiving laser ranging optical device according to claim 4, characterized in that: The focusing and filtering lens group (17) comprises a first lens (171), a narrow-band filter (172) and a second lens (173); The lens 1 (171) is a collimating lens composed of one or more lenses, which collimates the distance measuring light transmitted through the pinhole aperture (16) into parallel light and transmits it to the narrow-band filter (172); The narrow-band filter (172) is a narrow-band interference filter made by coating an interference filter film on a glass substrate, and is used for spectral filtering, has high transmission for the wavelength of ranging light, and absorbs or reflects other wavelengths; The second lens (173) is a focusing lens composed of one or more lenses, which refocuses the distance measurement return light onto the photosensitive surface of the distance measurement detector (18).

6. The optoelectronic system common aperture transmitting and receiving laser ranging optical device according to claim 5, characterized in that: The distance measuring laser (11) is a short pulse solid-state laser or a semiconductor laser; and / or The transmitting and receiving hole-punched mirror (12) is a reflector (14) made of glass or metal material, with a hole on the mirror corresponding to the position of the emitted laser beam, the diameter of the hole being slightly larger than the diameter of the laser beam, so that the laser beam emitted by the ranging laser (11) is emitted through the hole; and the surface of the mirror is coated with a high-reflective film of the ranging wavelength, which reflects the ranging return light and enters the ranging receiving optical path objective lens group (13).

7. The optoelectronic system common aperture transmitting and receiving laser ranging optical device according to claim 5, characterized in that: The objective lens group (13) is a focusing objective lens composed of a single lens or multiple lenses, which eliminates aberrations of the wavelength of the ranging light and is coated with an anti-reflection film, and is used to focus the range-finding return light; and / or The reflector (14) is made of metal or glass and coated with a high-reflection film of the wavelength of the ranging light, and is used for turning the light path.

8. The optoelectronic system common aperture transmitting and receiving laser ranging optical device according to claim 5, characterized in that: The pinhole aperture (16) is an aperture made of an opaque material, the pinhole diameter is slightly larger than the focal spot diameter of the ranging return light, and is used to transmit the ranging return light focal spot and block stray light outside the field of view; and / or The distance measuring detector (18) is an avalanche photodiode or other high-sensitivity photodetector, and is used to convert the distance measuring return light into an electrical signal.

Images