Coaxial multimode optical detection device

Abstract

The utility model provides a coaxial multimode optical detection device, which comprises a shaft sleeve vertically arranged on a frame and a hollow rotating shaft fixedly connected through a circumferential support, and the hollow rotating shaft and the shaft sleeve are rotatably sleeved through a bearing. And the rotary table motor is arranged between the rack and the hollow rotating shaft. The primary mirror is fixed at one end of the primary mirror rotating shaft, the primary mirror reflects external light to the secondary mirror after receiving the external light, the secondary mirror is obliquely arranged in an emergent light path of the primary mirror at an angle of 45 degrees, and the center line of a reflected light beam is parallel to the plane of the rotary table and the center line of the primary mirror rotating shaft. Light is reflected by the secondary mirror and then reaches at least one detector, and the detector rotates along with the rotary table. A light-transmitting cover is arranged on the upper portion of the rotary table and can be fixedly connected with the rotary table and rotate along with the rotary table, or the light-transmitting cover is fixedly connected with the machine frame and does not rotate along with the rotary table. The design that the primary mirror is arranged near the center of sphere of the light-transmitting cover realizes all-directional light detection, and keeps the stability and precision of the system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flight target detection technical field, especially relate to a coaxial multi-mode optical detection device. BACKGROUND

[0002] There are many difficulties in the current unmanned aerial vehicle target and airport bird target detection and tracking. Radar detection, radar has limitations, that is, it will not react to all moving targets; unmanned aerial vehicles are generally made of light wood and composite materials, and birds are organic bodies. These materials have wave-penetrating properties, making them have lower detectability. Only metal materials such as motors, engines, batteries, and wires, combined with small size and volume, greatly reduce the radar scattering area of the target itself, reduce the radar detection distance and discovery probability, and shorten the ground reaction time.

[0003] Photoelectric detection, at present, a platform is used to set multiple detection sources on a platform to integrate multiple detection source signals, but in the conventional scheme, the platform can only produce a reciprocating swing platform, which has large mass and slow swing speed, long signal interval time, and insufficient ability for fast target detection.

[0004] Moreover, the various existing detection technologies are independent of each other, not only in different optical diameters, but also in different axes, and it is difficult to achieve complete consistency of the phase angle and pitch angle between different detection sources, thereby requiring an additional control system to convert and integrate the signals of different detection sources, sharing the results of different detection sources, and requiring a background computer to integrate data according to the azimuth angle. The detector receiving unit must be set on the rotating platform or rotating pod, making electrical connection difficult and restricting the possibility of multiple simultaneous detection.

[0005] Search found that CN201620265488-a mid-infrared laser radar optical system, the rotating main shaft is set on the 10 optical axis, the principle of this scheme is correct, but there is a long optical path and the main mirror deviates from the rotating shaft of the turntable. At this time, if a light-transmitting protective shell is set, the main mirror 11 rotates around the 10 optical axis, the external light changes the relative position between the shell and the reflecting mirror 11, and the shell changes the arc. Corresponding to different refractive indices, the change in refractive index causes the external target to form a more serious aberration, misalignment, and other conditions on the detector, which even affects the accuracy of detection, especially for long-range small targets, which is prone to false positives and false negatives.

[0006] The technical scheme of a series of optical detection devices applied by the inventor in the early stage, and a multi-spectrum 3D rapid scanning detection and tracking device, an off-axis optical detection device and other technical schemes have realized coaxial emission or reception of multiple spectrums, and have realized miniaturization and light weight, although the technical scheme is feasible, but still has,

[0007] The designed optical scanning mirror must be protected by a semi-spherical light-transmitting cover, and the main mirror is arranged to deviate from the main shaft of the rotating table and deviate from the center of the spherical cover, when the mirror is driven by the pitching rotating motor to perform pitching scanning rotation, especially when the mirror is driven by the rotating table motor to perform azimuth scanning rotation, because the main mirror deviates from the center of the spherical cover, the light rays entering and exiting the transparent cover have different refractions at different azimuth angles and pitching angles, and thus a large image shift is generated, and the imaging quality of the camera detector is affected.

[0008] Therefore, on the one hand, the detection accuracy is affected, and on the other hand, a compensation lens needs to be added between the main mirror and the transparent cover to compensate for the image shift caused by optical refraction, however, it is found in practice that the compensation lens is difficult to meet the requirements of the bandwidth from 420-680nm visible light band to 8-12um long-wave infrared light, and the refractive index change caused by the relative position change of the lens and the light-transmitting cover, so although a huge design and processing cost is increased, better effect cannot be achieved for multi-mode detection.

[0009] In addition, although a special-shaped transparent cover can be used to improve the above problems, the transparent cover is not streamlined in appearance, and the problem of increased wind resistance is caused. Practical new type content

[0010] The utility model to be realized by the utility model is to overcome the problems in the prior art, and provide a coaxial multi-mode optical detection device.

[0011] The technical concept of the utility model is as follows: the applicant designs a coaxial multi-mode optical detection device through practical research,

[0012] A rack;

[0013] A shaft sleeve is vertically arranged on the rack;

[0014] A rotating table;

[0015] A hollow rotating shaft is vertically arranged between the rack and the rotating table, and the rotating table is fixedly connected to the hollow rotating shaft through a circumferential support; the hollow rotating shaft is rotatably connected to the shaft sleeve through a bearing;

[0016] A rotating table motor is arranged between the rack and the hollow rotating shaft and is used to drive relative movement of the rack and the hollow rotating shaft;

[0017] Further comprising:

[0018] a primary mirror and a secondary mirror arranged on the rotating table;

[0019] The primary mirror is fixedly arranged at one end of the primary mirror rotating shaft, and is driven by a primary mirror motor to realize pitching scanning and is driven by a rotating table motor to realize azimuth scanning together with the rotating table, so as to realize scanning of the primary mirror to the external space and receiving of the field of view light from the outside.

[0020] The primary mirror receives the external light and reflects it to the secondary mirror.

[0021] The secondary mirror is arranged in the outgoing light path of the primary mirror at an angle of 45°, and the center line of the reflected light beam between the primary mirror and the secondary mirror is parallel to the plane of the rotating table and parallel to the center line of the primary mirror rotating shaft.

[0022] The primary mirror receives the external light and reflects it to the secondary mirror, and then the secondary mirror reflects it to at least one detector, the detector rotates with the rotating table, the secondary mirror forms the center line of the reflected light beam, and the center line is parallel to the center axis of the rotating table.

[0023] The extension line of the rotating center axis of the rotating table intersects the center line of the primary mirror rotating shaft, and the intersection point is near the reflecting surface of the primary mirror.

[0024] A light-transmitting cover is arranged on the upper part of the rotating table, and the light-transmitting cover is fixedly connected with the rotating table and rotates with the rotating table, or is fixedly connected with the rack and does not rotate with the rotating table.

[0025] The light-transmitting cover is a spherical cover body with the intersection point of the extension line of the rotating center axis of the rotating table and the center line of the primary mirror rotating shaft as the spherical center, or is a conformal cover body composed of multiple light-transmitting lenses connected with each other.

[0026] The further improved technical scheme of the device is as follows:

[0027] Preferably, the secondary mirror is a total reflection mirror or a beam splitter.

[0028] When the secondary mirror is a total reflection mirror, the secondary mirror reflects the light beam to the second beam splitter and then to the first detector and the second detector.

[0029] When the secondary mirror is a beam splitter, the secondary mirror transmits the light beam of a set wave band to the third detector arranged on the rotating table, and reflects the light beams of other wave bands to the first detector and the second detector.

[0030] More preferably, the center line of the reflected light beam between the primary mirror and the secondary mirror is in the same plane as the center line of the primary mirror rotating shaft and is parallel to each other, the center line of the reflected light beam between the primary mirror and the secondary mirror and the center line of the primary mirror rotating shaft both pass through the center point near the reflecting surface of the primary mirror, and the extension line of the rotating center axis of the rotating table passes through the center point near the reflecting surface of the primary mirror.

[0031] More preferably, the vicinity of the center point refers to a circle with the center point as the center and a radius of 2 mm.

[0032] More preferably, the turntable is further provided with a light transmission hole, which is arranged in the area between the outside of the center axis of the turntable and the edge of the turntable, and the light beam reflected by the secondary mirror passes through the light transmission hole to reach the at least one detector.

[0033] More preferably, when the light transmission cover rotates with the turntable, the light transmission cover can be provided with light transmission strips in an arc shape, and the other parts that do not transmit light are processed with light-blocking materials.

[0034] When the light transmission cover does not rotate with the turntable, the entire light transmission cover is processed with light transmission materials. Alternatively, a plurality of light transmission materials are connected to each other to form a conformal cover body having a similar aerodynamic shape as the mounting body.

[0035] More preferably, a lens group is arranged between the primary mirror and the secondary mirror, which compresses the external light beam so that the light beam intersects between the lens group and the lens group-1 and the lens group-2, thereby forming primary imaging, and the lens group-1 and the lens group-2 of the detector form secondary imaging, thereby reducing the volume of the secondary mirror, the second beam splitter, and the lens group-1 and the lens group-2.

[0036] Advantages of the technical solution:

[0037] 1. The light transmission cover is provided in a spherical shape, the center of the sphere is located at the intersection point of the primary mirror and the center axis of the turntable, which is located near the center of the reflection surface of the primary mirror, at this time

[0038] The center axis of the turntable passes through the center point of the primary mirror, so that when the turntable rotates to drive the primary mirror to perform azimuth angle scanning, the position of the primary mirror and the center axis does not change regardless of the azimuth angle, that is, the relative relationship between the primary mirror and the light transmission cover does not change due to the rotation of the turntable during scanning.

[0039] Similarly, when the primary mirror motor drives the primary mirror to perform elevation scanning, the position of the primary mirror and the center axis does not change regardless of the elevation angle, that is, the relative relationship between the primary mirror and the light transmission cover does not change due to the change of the elevation angle during scanning.

[0040] Based on the above advantages 1 and 2, it is possible to set a phase difference compensation mirror in front of the lens, which can greatly improve the imaging quality.

[0041] When the light transmission cover is provided as a conformal light transmission cover, the reflector is arranged at the center position in the light transmission cover. Due to different elevation angles and azimuth angles corresponding to different light transmission modules, the geometric thickness of the light transmission cover module can be used to reduce the phase change, so as to improve the imaging quality when the target is gazed at this angle.

[0042] The present scheme has compact structure and short optical path length, so that the lens size is smaller and the design and manufacturing costs are reduced.

[0043] In the conventional scheme, there are changes in azimuth angle during the scanning of the turntable, changes in azimuth angle caused by the rotation arm formed by the off-axis setting of the primary mirror, and displacement of the reflecting mirror, which increase the design difficulty and uncertainty of the image shift compensation unit. In general, in order to simplify the design difficulty, only the influence of the change in angle is considered during the design of compensation, so the compensation effect is not good. In the present case, the compensation unit is designed without considering the displacement of the lens, only considering the change in azimuth angle, so the design of the compensation unit is simplified, the compensation effect is improved, and the imaging quality is ensured.

[0044] The lens group is arranged between the primary mirror and the secondary mirror, which compresses the incident light by using the lens group, and cooperates with the lens group of the detector to realize the imaging of the target. In this way, the diameter of the lens in the optical path is reduced, and the volume of the detector lens is reduced, which is particularly suitable for installation on an aircraft. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1a.1 And Figure 1a.2 Schematic diagram of the secondary mirror being a reflecting mirror and the light transmission cover being fixedly connected with the turntable;

[0046] Figure 1b Schematic diagram of the secondary mirror being a reflecting mirror and the light transmission cover being fixedly connected with the turntable;

[0047] Figure 1c Schematic diagram of the secondary mirror being a reflecting mirror and the light transmission cover being fixedly connected with the turntable;

[0048] Figure 1d Schematic diagram of the secondary mirror being a reflecting mirror and the light transmission cover being fixedly connected with the turntable;

[0049] Figure 1e Schematic diagram of the secondary mirror being a reflecting mirror and the light transmission cover being fixedly connected with the turntable;

[0050] Figure 1f Schematic diagram of the light transmission cover being a multi-faceted light transmission mirror;

[0051] Figure 1g Schematic diagram of the light transmission cover being a multi-faceted light transmission mirror;

[0052] Figure 2.1 And Figure 2.2 Schematic diagram of the light transmission cover being a multi-faceted light transmission mirror;

[0053] Figure 3a Schematic diagram of the light transmission cover being a multi-faceted light transmission mirror;

[0054] Figure 3b Schematic diagram of the light transmission cover being a multi-faceted light transmission mirror;

[0055] Figure 4a , the structure schematic diagram of setting lens group;

[0056] Figure 4b , the structure schematic diagram of setting lens group;

[0057] Figure 5 , the schematic diagram of secondary imaging principle. DETAILED DESCRIPTION

[0058] Embodiment 1

[0059] The embodiment provides a coaxial multi-mode light detection device, and the specific structure is as follows:

[0060] The frame and the shaft sleeve: the frame is vertically installed with the shaft sleeve, and the two are fixedly connected, so that the stability and reliability of the structure are ensured.

[0061] The hollow rotating shaft: the hollow rotating shaft is vertically arranged between the frame and the rotating table and is fixedly connected with the rotating table through a circumferential support. The rotating table motor is arranged between the frame and the hollow rotating shaft and is used to drive the rotating table to rotate relative to the frame.

[0062] The primary mirror and the secondary mirror: the primary mirror is installed at one end of the primary mirror rotating shaft and is driven by the primary mirror motor to realize scanning in the pitch direction, and is driven by the rotating table motor to complete scanning in the azimuth direction together with the rotating table, so that omnidirectional scanning of the surrounding environment and receiving of the field of view light are realized. The external light received by the primary mirror is reflected to the secondary mirror.

[0063] The secondary mirror: the secondary mirror is arranged at an angle of 45° in the outgoing light path of the primary mirror and adopts a beam splitter design. The center line of the reflected light beam between the primary mirror and the secondary mirror is parallel to the rotating table plane and the center line of the primary mirror rotating shaft. The light received by the primary mirror is guided to at least one detector after being reflected by the secondary mirror, and the detectors rotate together with the rotating table. If the secondary mirror is a total reflection mirror, the light beam is reflected to a second beam splitter and then distributed to a first detector and a second detector.

[0064] The layout of the rotating center axis of the rotating table and the primary mirror rotating shaft: the extension line of the rotating center axis of the rotating table intersects with the center line of the primary mirror rotating shaft, and the intersection point is close to the reflecting surface of the primary mirror.

[0065] The light-transmitting cover: the light-transmitting cover is arranged on the upper portion of the rotating table, and the cover body can be selected to be fixedly connected with the rotating table and rotate together or be fixedly connected with the frame and remain stationary. The light-transmitting cover can be a spherical cover body made at the center of a sphere with the intersection point of the extension line of the rotating center axis of the rotating table and the center line of the primary mirror rotating shaft as the center, or a conformal cover body composed of a plurality of light-transmitting lenses connected with each other.

[0066] Precise control of the optical path: the center line of the reflected light beam between the primary mirror and the secondary mirror is not only in the same plane as the center line of the primary mirror rotation axis, but also parallel to each other, and they both pass through the center point of the primary mirror reflecting surface. Here, "nearby" means a region with a center point and a radius of no more than 5 mm, and more preferably a region with a radius of no more than 2 mm.

[0067] Light transmission hole: in order to make the light beam reflected by the secondary mirror reach the detector smoothly, a light transmission hole is provided in the area near the edge of the turntable outside the center axis of the turntable.

[0068] Optimized design of light transmission cover: when the light transmission cover rotates with the turntable, it is designed to have light transmission only in part of the area, that is, it is designed as an arc-shaped light transmission strip, and the rest is made of non-transparent material. This can not only meet the optical performance requirements, but also effectively reduce the material cost and weight.

[0069] Through the above design, the coaxial multi-mode light detection device provided by the embodiment can realize efficient and accurate environmental perception and information collection, and is suitable for application in various scenes.

[0070] Embodiment 2

[0071] The embodiment provides a coaxial multi-mode light detection device, and the specific structure is as follows:

[0072] Connection of the frame and the turntable: the device comprises a frame, and a shaft sleeve is vertically installed on the frame. The turntable is connected to the frame through a hollow rotating shaft, wherein a bearing is arranged between the hollow rotating shaft and the shaft sleeve to ensure that the turntable can rotate smoothly. A turntable motor is further installed between the frame and the hollow rotating shaft, and is used to drive the turntable to rotate relative to the frame.

[0073] Arrangement of the primary mirror and the secondary mirror: the primary mirror and the secondary mirror are installed on the turntable. The primary mirror is fixed at one end of the primary mirror rotation axis, can realize scanning in the pitch direction through a primary mirror motor, and can realize scanning in the azimuth direction through the driving of the turntable motor, so as to complete comprehensive scanning of the external space and reception of the field of view light. The external light received by the primary mirror is reflected to the secondary mirror.

[0074] Design of the secondary mirror: the secondary mirror is arranged at an angle of 45° in the outgoing light path of the primary mirror and is used as a reflecting mirror. The center line of the reflected light beam between the primary mirror and the secondary mirror is parallel to the plane of the turntable and parallel to the center line of the primary mirror rotation axis. After the light received by the primary mirror is reflected by the secondary mirror, it can reach at least one detector, and the detectors rotate with the turntable. The center line of the reflected light beam formed by the secondary mirror is parallel to the center axis of the turntable.

[0075] Precise control of the optical path: the center line of the reflected light beam between the primary mirror and the secondary mirror and the center line of the primary mirror rotation axis are not only in the same plane, but also parallel to each other. Both center lines pass through the center point of the primary mirror reflecting surface near the center point, which is defined as the center point of the circle with a radius of 5 mm; more preferably, the center point of the circle with a radius of 2 mm. In addition, the extension line of the rotation center axis of the turntable also passes through the center point of the primary mirror reflecting surface near the center point.

[0076] Design of the light-transmitting cover: a light-transmitting cover is installed above the turntable, which can be fixedly connected with the turntable and rotate with it, or fixedly connected with the rack (or fixed flange) and not rotate with the turntable. The light-transmitting cover can be designed as a spherical cover body with the center of the sphere near the intersection of the extension line of the rotation center axis of the turntable and the center line of the primary mirror rotation axis, or a conformal light-transmitting cover composed of multiple light-transmitting lenses connected with each other. This design helps to reduce the air resistance in a specific direction and improve the working efficiency of the device.

[0077] Setting of the light hole: in order to make the light beam reflected by the secondary mirror reach the detector smoothly, a light hole is also provided on the turntable. The light hole is located outside the center axis of the turntable and in the area between the edges of the turntable, ensuring that the light beam can pass through the light hole to reach the detector.

[0078] Optimized design of the light-transmitting cover: when the light-transmitting cover rotates with the turntable, it can be designed as an arc-shaped strip light-transmitting strip with only part of the area having light-transmitting property, and the rest part using non-light-transmitting material. Such design not only reduces the total area of the light-transmitting cover, but also reduces the material cost and the overall weight.

[0079] Embodiment 3

[0080] A coaxial multi-mode light detection device, comprising a rack, a shaft sleeve and a hollow rotating shaft vertically arranged between the rack and the turntable, the rack being fixedly connected with the shaft sleeve, the turntable being fixedly connected with the hollow rotating shaft through a circumferential support, a turntable motor being arranged between the rack and the hollow rotating shaft for driving the relative movement of the two, further comprising:

[0081] A primary mirror and a secondary mirror are arranged on the turntable.

[0082] The primary mirror is driven by a primary mirror motor to realize pitch scanning, and is driven by the turntable motor to realize azimuth scanning with the turntable, so as to realize the scanning of the primary mirror to the external space and the reception of the external field of view light; the primary mirror receives the external light and reflects it to the secondary mirror,

[0083] The secondary mirror is a 45° inclined splitter arranged in the outgoing light path of the primary mirror, the line connecting the center point of the secondary mirror and the center point of the primary mirror is parallel to the plane of the turntable, the primary mirror receives the external light and reflects it to the secondary mirror, and then the light is reflected by the secondary mirror to at least one detector, the detector rotates with the turntable, the secondary mirror forms a center line of the reflected light beam, and the center line is parallel to the center axis of the turntable.

[0084] The secondary mirror is a beam splitter;

[0085] When the secondary mirror is a total reflection mirror, the secondary mirror reflects the light beam to the second beam splitter and then to the first detector and the second detector;

[0086] When the secondary mirror is a beam splitter, the secondary mirror transmits the light beam of a set wavelength to the third detector arranged on the rotary table and reflects the light beam of other wavelengths to the first detector and the second detector; or a conformal light transmission cover is formed by connecting multiple light transmission mirrors with each other, so that the air resistance in a specific direction can be reduced.

[0087] A light transmission cover is arranged on the upper part of the rotary table, and the light transmission cover is fixedly connected with the rotary table and rotates with the rotary table, or is fixedly connected with the rack and does not rotate with the rotary table;

[0088] The light transmission cover is a spherical light transmission cover with the center point near the reflecting surface of the primary mirror as the spherical center;

[0089] The center line of the reflected light beam between the primary mirror and the secondary mirror and the center line of the rotary shaft of the primary mirror are in the same plane and are parallel to each other, and the center line of the reflected light beam between the primary mirror and the secondary mirror and the center line of the rotary shaft of the primary mirror both pass through the center point near the reflecting surface of the primary mirror, and the center point near the center point refers to the circumference within 5 mm of the center point as the center, and more preferably, the center point near the center point refers to the circumference within 2 mm of the center point as the center.

[0090] The rotary table is also provided with a light transmission hole, and the light transmission hole is arranged in the area between the outside of the rotary shaft and the edge of the rotary table, and the light beam reflected by the secondary mirror passes through the light transmission hole to reach at least one detector;

[0091] When the light transmission cover rotates with the rotary table, the light transmission cover can be arranged as an arc-shaped light transmission strip, and other parts can be processed with non-transparent materials; (in this way, the area of the light transmission cover is reduced, and the cost is reduced)

[0092] A lens group is further arranged between the primary mirror and the secondary mirror, and the lens group compresses the external light beam, so that the light beam forms a cross between the lens group and the lens-1 and the lens group-2, thereby forming a primary imaging, and such arrangement reduces the volume of the secondary mirror, the second beam splitter, and the lens-1 and the lens-2.

[0093] Embodiment 4

[0094] A coaxial multi-mode light detection device, comprising a rack, a shaft sleeve and a hollow rotating shaft vertically arranged between the rack and the rotary table, the rack is fixedly connected with the shaft sleeve, the rotary table is fixedly connected with the hollow rotating shaft, a bearing is arranged between the hollow rotating shaft and the shaft sleeve, a rotary table motor is arranged between the rack and the hollow rotating shaft for driving the relative movement of the two,

[0095] The main mirror and the secondary mirror are arranged on the rotating platform;

[0096] The main mirror receives the reflected external light and reaches the secondary mirror. The main mirror is driven by a main mirror motor to realize the pitching scan and is driven by a rotating platform motor to realize the azimuth scan with the rotating platform, so as to realize the scanning of the main mirror to the external space and the receiving of the external field of view light;

[0097] The secondary mirror is a 45° oblique mirror arranged in the outgoing light path of the main mirror. The center line of the secondary mirror and the center line of the main mirror are parallel to the plane of the rotating platform. The main mirror receives the reflected external light and reaches the secondary mirror. After being reflected by the secondary mirror, the light reaches at least one detector. The detector rotates with the rotating platform. The center line of the reflected light beam formed by the secondary mirror is parallel to the central axis of the rotating platform.

[0098] A light-transmitting cover is arranged on the upper part of the rotating platform. The light-transmitting cover is fixedly connected with the rotating platform and rotates with the rotating platform, or is fixedly connected with the rack (fixed flange) and does not rotate with the rotating platform.

[0099] The light-transmitting cover is a spherical light-transmitting cover with the center point of the main mirror reflecting surface as the spherical center.

[0100] Or a conformal light-transmitting cover composed of multiple light-transmitting mirrors connected with each other. Such design can reduce the air resistance in a specific direction.

[0101] The center line of the reflected light beam between the main mirror and the secondary mirror is in the same plane as the center line of the main mirror rotating shaft and is parallel to each other. Both the center line of the reflected light beam between the main mirror and the secondary mirror and the center line of the main mirror rotating shaft pass through the center point of the main mirror reflecting surface. The extension line of the rotating center axis of the rotating platform passes through the center point of the main mirror reflecting surface. The center point is the center of a circle with a radius of 5 mm. More preferably, the center point is the center of a circle with a radius of 2 mm.

[0102] The rotating platform is also provided with a light-transmitting hole. The light-transmitting hole is arranged in the area between the outside of the rotating center axis and the edge of the rotating platform. The light beam reflected by the secondary mirror passes through the light-transmitting hole to reach at least one detector.

[0103] When the light-transmitting cover rotates with the rotating platform, the light-transmitting cover can be arranged as an arc-shaped light-transmitting strip, and the other parts can be made of non-light-transmitting material. (In this way, the area of the light-transmitting cover is reduced, and the cost is reduced)

[0104] A lens group is arranged between the main mirror and the secondary mirror. The lens group compresses the external light beam, so that the light beam forms an intersection between the lens group and the lens-1 and lens group-2, thereby forming a primary imaging. Such arrangement reduces the volume of the secondary mirror, the second light splitter, and the lens-1 and lens-2.

[0105] The information disclosed in this Background section is only for the purpose of increasing the understanding of the general background of the present application and should not be taken as an acknowledgement or any form of suggestion that this information forms prior art with regard to the present application.

Claims

1. A coaxial multi-mode optical detection device, comprising: a frame; a shaft sleeve vertically arranged on the frame; a turntable; a hollow rotating shaft vertically arranged between the frame and the turntable, the turntable being fixedly connected to the hollow rotating shaft through a circumferential support, and the hollow rotating shaft being rotatably connected to the shaft sleeve through a bearing; a turntable motor arranged between the frame and the hollow rotating shaft for driving relative movement therebetween; characterized in that it further comprises: a primary mirror and a secondary mirror arranged on the turntable; the primary mirror being fixedly arranged at one end of a primary mirror rotating shaft, and being driven by a primary mirror motor to realize pitch scanning, and being driven by the turntable motor to realize azimuth scanning together with the turntable, so as to realize scanning of the primary mirror to an external space and receiving of external field of view light; the secondary mirror being arranged at an angle of 45° in an outgoing light path of the primary mirror, a center line of a reflected light beam between the primary mirror and the secondary mirror being parallel to a plane of the turntable, and the center line being parallel to a center line of the primary mirror rotating shaft; the primary mirror receiving external light and reflecting the external light to the secondary mirror, and the secondary mirror reflecting the light to at least one detector after receiving the light, the detector rotating together with the turntable, the secondary mirror forming a center line of the reflected light beam, the center line being parallel to a center axis of the turntable; an extension line of the center axis of the turntable intersecting the center line of the primary mirror rotating shaft, and an intersection point being located near a reflecting surface of the primary mirror; a light-transmitting cover being arranged on an upper portion of the turntable, the light-transmitting cover being fixedly connected to the turntable and rotating together with the turntable, or being fixedly connected to the frame and not rotating together with the turntable; the light-transmitting cover being a spherical cover body with a center of the spherical cover body being located near the intersection point of the extension line of the center axis of the turntable and the center line of the primary mirror rotating shaft, or being a conformal cover body formed by a plurality of light-transmitting lenses being connected to each other. the secondary mirror being a total reflection mirror or a light splitting mirror; 2. The coaxial multi-mode optical probing apparatus of claim 1, wherein: when the secondary mirror is the total reflection mirror, the secondary mirror reflects the light beam to a second light splitting mirror and then to a first detector and a second detector; when the secondary mirror is the light splitting mirror, the secondary mirror transmits a light beam of a set wave band to a third detector arranged on the turntable, and reflects light beams of other wave bands to the first detector and the second detector. the center line of the reflected light beam between the primary mirror and the secondary mirror and the center line of the primary mirror rotating shaft are in the same plane and parallel to each other, and both the center line of the reflected light beam and the center line of the primary mirror rotating shaft pass through a center point near the reflecting surface of the primary mirror, the center point near the reflecting surface being a circular periphery with the center point as a center and a radius of 5 mm; 3. A coaxial multi-mode optical probe device according to claim 1 or 2, wherein: the center point near the reflecting surface being a circular periphery with the center point as a center and a radius of 2 mm.

4. The coaxial multi-mode optical probe device of claim 3, wherein: the turntable is further provided with a light passing hole, the light passing hole being arranged in a region between an outer side of the center axis of the turntable and an edge of the turntable, and the light beam reflected by the secondary mirror passing through the light passing hole to reach the at least one detector.

5. The coaxial multi-mode optical probe of claim 1, wherein: when the light-transmitting cover rotates together with the turntable, the light-transmitting cover can be provided with light-transmitting strips in an arc shape, and other portions not transmitting light are made of non-light-transmitting materials; 6. The coaxial multi-mode optical probe of claim 1, wherein: when the light-transmitting cover does not rotate together with the turntable, the whole light-transmitting cover is made of light-transmitting materials, or is formed by a plurality of light-transmitting materials being connected to each other and having a similar aerodynamic shape to an installation body, i.e., the conformal cover body. ​ 7. The coaxial multi-mode optical probe of claim 1, wherein: The primary mirror and the secondary mirror are provided with a lens group, which compresses the external light beam, so that the light beam crosses between the lens group and the lens group-1 and the lens group-2, thereby forming primary imaging, and the lens group-1 and the lens group-2 of the detector form secondary imaging, thereby reducing the volume of the secondary mirror, the second beam splitter and the lens group-1 and the lens group-2.

Images