Novel optical axis real-time monitoring device

Abstract

The utility model discloses a novel optical axis real-time monitoring device, which comprises an optical path assembly, a control module and a fine tracking camera, and is characterized in that the optical path assembly comprises a laser optical axis adjusting mechanism, a coupling mirror, a corner reflector and an optical wedge; the emitted laser is reflected by the laser optical axis adjusting mechanism and then enters the coupling mirror; the coupling mirror is arranged on a light path where visible light reflected by an external target enters the fine tracking camera for imaging, the front face of the coupling mirror faces the laser optical axis adjusting mechanism, the back face of the coupling mirror faces the fine tracking camera, and emission laser entering the coupling mirror is reflected by the front face of the coupling mirror and then emits tracking laser. Monitoring laser is emitted after being transmitted by the front side of the coupling mirror, the corner reflector is located in a monitoring laser light path on the back side of the coupling mirror, an optical wedge is arranged between the corner reflector and the coupling mirror, and the control module is electrically connected with the laser optical axis adjusting mechanism and the fine tracking camera. According to the utility model, the laser optical axis is monitored and corrected while a target is tracked, and the real-time monitoring precision of the optical axis is improved.

Description

Technical Field

[0001] The utility model belongs to the field of photoelectric detection, and specifically relates to a novel optical axis real-time monitoring device. Background Art

[0002] Many optical systems contain two or more optical devices, whose optical paths are combined into one through a coupling mirror. Normally, after two or more light beams are coupled, their optical axes are parallel. However, due to structural deformation or other reasons, the optical path may drift after a period of time, causing the optical axes to be non-parallel. At present, in order to monitor the parallelism of the optical axes of two optical devices after coupling, an additional optical axis monitoring system is generally added to the optical path, or a detection device in the optical path is used to detect the optical axis before the device is working, and then the optical axis is corrected through an electric adjustment mirror. The imaging position of the latter monitoring optical path will be near the center of the detector, affecting its detection capability, so real-time monitoring cannot be performed.

[0003] The Chinese invention patent with the announcement number CN111102942B discloses a real-time correction system and method for the parallelism between the laser emission optical axis and the tracking system optical axis, wherein the laser passes through a beam splitter and enters the target tracking system to generate a target image; the beacon light passes through the beam splitter and is reflected by a reflective prism and enters the target tracking system to generate a beacon light spot; the position information of the target image and the beacon light spot is determined by a control system, the deviation of the optical axis of the laser and the target tracking system is calculated according to the calibration origin, and the direction of the laser optical axis is corrected in real time by quickly controlling the reflector. Although the above system realizes the parallelism monitoring of the laser optical axis, the addition of the beacon light will increase the complexity of the laser emission optical path, reduce the reliability of the laser emission optical path, and affect the real-time monitoring accuracy of the optical axis. In addition, the method of using a reflective prism to deflect a certain angle to make the beacon light spot and the target image misaligned is also lacking in precision, and the deflection range of the beacon light cannot be effectively controlled, which affects the calculation of the deviation and the accuracy of real-time monitoring and adjustment of the laser optical axis.

[0004] Therefore, in order to meet the practicality and accuracy of the existing optical system, it is necessary not only to monitor and correct the parallelism of the optical axis in real time, but also to take into account the precision and accuracy of the optical axis monitoring. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art, monitor the laser optical axis in real time and make corrections while tracking the target, improve the monitoring accuracy, and provide a new optical axis real-time monitoring device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A novel optical axis real-time monitoring device comprises an optical path component, a control module and a precision tracking camera, wherein the optical path component comprises an optical path coupling mechanism and an optical path deflection mechanism, and the optical path coupling mechanism comprises a laser optical axis adjustment mechanism and a coupling mirror;

[0008] The laser optical axis adjustment mechanism is arranged in the optical path of the emitted laser, and the emitted laser enters the coupling mirror after being reflected by the laser optical axis adjustment mechanism;

[0009] The coupling mirror is arranged on the optical path of the visible light reflected by the external target entering the fine tracking camera for imaging. The front side of the coupling mirror faces the laser optical axis adjustment mechanism, and the back side faces the fine tracking camera. The emission laser entering the coupling mirror is reflected by the front side of the coupling mirror and then emits the tracking laser. The monitoring laser is emitted from the back side after being transmitted by the coupling mirror. The tracking laser is used to emit to the target. The visible light reflected by the target and the tracking laser reflected by the target are both coupled by the front side of the coupling mirror and then transmitted into the fine tracking camera to generate an imaging spot.

[0010] The optical path deflection mechanism includes a corner reflector, which is located in the monitoring laser optical path on the reverse side of the coupling mirror. An optical wedge is provided in the monitoring laser optical path between the corner reflector and the coupling mirror, and the optical wedge is used to deflect the direction of the monitoring laser. The monitoring laser is deflected in direction after passing through the corner reflector and the optical wedge. After the deflection, the monitoring laser is reflected by the reverse side of the coupling mirror and enters the precision tracking camera to generate a monitoring light spot.

[0011] The control module is electrically connected to the laser optical axis adjustment mechanism and the precision tracking camera respectively. The control module is used to control the reflection surface angle of the laser optical axis adjustment mechanism to adjust the tracking laser optical axis. The precision tracking camera is used to image, obtain the imaging spot and monitor the position of the spot and output the position information to the control module.

[0012] The utility model realizes monitoring and correction of the laser optical axis while tracking the target. While coupling the visible light and the laser reflected by the target through the coupling mirror, the emitted laser is also separated into the monitoring laser. The monitoring laser is angularly deflected through the corner reflector and the optical wedge, enters the precision tracking camera after being reflected by the reverse side of the coupling mirror, and forms an image at the center edge of the precision tracking camera. The deflection angle of the monitoring laser is calculated through the precision tracking camera and the control module, and the laser optical axis adjustment mechanism is controlled to correct the angle error, so that the tracking laser optical axis and the optical axis of the precision tracking camera are corrected to a parallel state in real time.

[0013] In order to ensure that the optical axis of the precision tracking camera always points to the target and to ensure the precise pointing of the optical axis of the precision tracking camera, the optical path component also includes a camera optical axis adjustment mechanism, which is also arranged on the optical path of the visible light reflected by the external target entering the precision tracking camera for imaging, and the camera optical axis adjustment mechanism is located on the front side of the coupling mirror. The visible light reflected by the target and the tracking laser reflected by the target are both reflected by the camera optical axis adjustment mechanism and then coupled through the front side of the coupling mirror. The camera optical axis adjustment mechanism is electrically connected to the control module, and is used to adjust the angle of the reflection surface under the control of the control module to adjust the optical axis of the precision tracking camera.

[0014] In order to monitor the laser passing through the optical wedge once and only once, a double-aperture aperture is arranged between the corner reflector and the optical wedge, and the first aperture and the second aperture of the double-aperture aperture are symmetrical along the center of the corner reflector axis.

[0015] Preferably, the inclined surface of the optical wedge is arranged on a side away from the reflecting surface of the corner reflector.

[0016] Preferably, the camera optical axis adjustment mechanism adopts a fast reflection mirror.

[0017] Preferably, the laser optical axis adjustment mechanism adopts an electric adjustment mirror.

[0018] In order to facilitate the installation and adjustment of the optical wedge angle, it also includes a corner reflector seat for installing the corner reflector and an optical wedge seat for installing the optical wedge. The corner reflector seat is integrated with the double-aperture aperture, and the optical wedge seat is movably connected to the corner reflector seat.

[0019] Preferably, the optical wedge seat and the corner reflector seat are connected by threads.

[0020] In order to fix the optical wedge after the angle is adjusted, a fastener is provided on the optical wedge seat for locking and fixing the optical wedge seat.

[0021] The utility model realizes real-time monitoring of the optical axis. When the optical axis drift is detected, the optical axis can be quickly corrected to ensure the consistency of the optical axis after the optical path coupling, and the monitoring accuracy is high. In addition, the structure is compact, the space occupied is small, and it can work in real time, which greatly improves the stability of project work. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described in detail below with reference to the accompanying drawings:

[0023] Figure 1 It is the optical path principle diagram of the utility model;

[0024] Figure 2 It is a schematic diagram of the imaging position of the precision tracking camera of the utility model;

[0025] Figure 3 This is a principle diagram of the optical path of the monitoring laser of the utility model, which first passes through the optical wedge and then enters the double-aperture aperture;

[0026] Figure 4 It is a comparison diagram of the imaging spot position and the monitoring spot position of the utility model;

[0027] Figure 5 It is the installation diagram of the utility model;

[0028] Figure 6 It is a schematic diagram of the installation of the optical path deflection mechanism of the utility model;

[0029] Figure 7 It is a schematic diagram of the structure of the corner reflector of the utility model;

[0030] Figure 8 It is a schematic diagram of the double-aperture aperture structure of the utility model.

[0031] Explanation of the reference numerals: 1-laser; 2-laser optical axis adjustment mechanism; 3-coupling mirror; 4-camera optical axis adjustment mechanism; 5-precision tracking camera; 6-target; 7-corner reflector; 8-optical wedge; 9-double-aperture aperture; 901-first hole; 902-second hole; 10-optical wedge seat; 11-corner reflector seat. DETAILED DESCRIPTION

[0032] like Figure 1 As shown, the utility model provides a novel optical axis real-time monitoring device, including an optical path component, a control module and a precision tracking camera 5, the optical path component includes an optical path coupling mechanism and an optical path deflection mechanism, the optical path coupling mechanism includes a laser optical axis adjustment mechanism 2 and a coupling mirror 3; the laser optical axis adjustment mechanism 2 is arranged in the emitted laser optical path, the emitted laser enters the coupling mirror 3 after being reflected by the laser optical axis adjustment mechanism 2, and the laser optical axis adjustment mechanism 2 can adopt an electric adjustment mirror.

[0033] The coupling mirror 3 is arranged on the optical path of the visible light reflected by the external target entering the fine tracking camera 5 for imaging. The front side of the coupling mirror 3 is arranged to face the laser optical axis adjustment mechanism 2, and the back side is arranged to face the fine tracking camera 5. The emission laser entering the coupling mirror 3 is reflected by the front side of the coupling mirror 3 and then emits the tracking laser. The optical paths of the emission laser and the tracking laser are shown in FIG. Figure 1 The solid line in the figure is transmitted through the coupling mirror 3 and then emitted from the reverse side. The monitoring laser light path is shown in FIG. Figure 1 The dotted line in the figure indicates that the tracking laser is used to be emitted to the target. The visible light reflected by the target and the tracking laser reflected by the target are coupled through the front side of the coupling mirror 3 and then transmitted into the precision tracking camera 5 to generate an imaging spot.

[0034] The optical path component also includes a camera optical axis adjustment mechanism 4, which is also arranged on the optical path of the visible light reflected by the external target entering the precision tracking camera 5 for imaging, and the camera optical axis adjustment mechanism 4 is located on the front side of the coupling mirror 3. The visible light reflected by the target and the tracking laser reflected by the target are reflected by the camera optical axis adjustment mechanism 4 and then coupled through the front side of the coupling mirror 3. The camera optical axis adjustment mechanism 4 is electrically connected to the control module. The camera optical axis adjustment mechanism 4 is used to adjust the angle of the reflection surface under the control of the control module to adjust the optical axis of the precision tracking camera 5. The camera optical axis adjustment mechanism 4 can use a fast reflection mirror. According to the target imaging information monitored by the precision tracking camera 5, the control module controls the camera optical axis adjustment mechanism 4 to swing quickly so that the optical axis of the precision tracking camera 5 always points to the target.

[0035] The optical path deflection mechanism includes a corner reflector 7, which is located in the monitoring laser optical path on the back side of the coupling mirror 3. The corner reflector 7 is used to make the monitoring laser return parallel to the original optical path. An optical wedge 8 is arranged in the monitoring laser optical path between the corner reflector 7 and the coupling mirror 3. The inclined surface of the optical wedge 8 can be arranged on the side away from the reflecting surface of the corner reflector 7. The optical wedge 8 is used to deflect the direction of the monitoring laser. The monitoring laser is deflected in direction after passing through the corner reflector 7 and the optical wedge 8. After the direction is deflected, the monitoring laser is reflected by the back side of the coupling mirror 3 and enters the precision tracking camera 5 to generate a monitoring light spot. The monitoring light spot and the imaging light spot are separated from each other.

[0036] A double-aperture aperture 9 is provided between the corner reflector 7 and the optical wedge 8, and the first hole 901 and the second hole 902 of the double-aperture aperture 9 are symmetrical along the axis of the corner reflector 7. Through the double-aperture aperture 9, the monitoring laser can enter from one of the holes of the aperture and then be emitted from the other hole, so that the monitoring laser passes through the optical wedge 8 only once and is deflected only once, so as to form an image at a position deviating from the center of the fine tracking camera 5, thereby achieving real-time monitoring of the tracking laser optical axis, and will not affect the tracking effect of the fine tracking camera 5 on the target, and avoid passing through the optical wedge 8 twice when entering and exiting the double-aperture aperture 9, resulting in no angle deflection of the monitoring laser, interfering with the imaging at the center of the fine tracking camera 5, and affecting the tracking quality.

[0037] like Figure 1 and 2 As shown, the monitoring laser first enters the corner reflector 7 through the first hole 901 of the double-aperture aperture 9, and then enters the wedge 8 through the second hole 902 of the double-aperture aperture 9 after being reflected by the corner reflector 7. After being deflected by the wedge 8 and reflected by the reverse side of the coupling mirror 3, the image after entering the precision tracking camera 5 falls above the target imaging position; Figure 3As shown, the monitoring laser first enters the optical wedge 8, and after being deflected by the optical wedge 8, it passes through the second hole 902 of the double-aperture aperture 9 and enters the corner reflector 7. After being reflected by the corner reflector 7, it is emitted through the first hole 901 of the double-aperture aperture 9, and after being reflected by the reverse side of the coupling mirror 3, the image after entering the precision tracking camera 5 falls below the target imaging position, as shown in FIG. Figure 4 shown.

[0038] The control module is electrically connected to the laser optical axis adjustment mechanism 2 and the precision tracking camera 5 respectively. The control module is used to control the reflection surface angle of the laser optical axis adjustment mechanism to adjust the tracking laser optical axis. The precision tracking camera 5 is used to image, obtain the position of the imaging spot and the monitoring spot and output the position information to the control module. Since the deflection direction of the monitoring laser after passing through the optical wedge 8 is constant, the position of its imaging on the precision tracking camera 5 is also constant. When the optical axis of the tracking laser and the optical axis of the precision tracking camera 5 are inconsistent after coupling due to external reasons, the position of the monitoring laser imaging on the precision tracking camera 5 will change. By calculating the deflection angle of the monitoring laser and controlling the laser optical axis adjustment mechanism 2 to correct the angle error, the tracking laser optical axis and the optical axis of the precision tracking camera 5 can be corrected to a parallel state in real time.

[0039] The utility model realizes monitoring and correction of the laser optical axis while tracking the target. While coupling the visible light and the laser reflected by the target through the coupling mirror 3, the emitted laser is also separated into the monitoring laser. The monitoring laser is angularly deflected through the corner reflector 7 and the optical wedge 8, and enters the precision tracking camera 5 after being reflected by the reverse side of the coupling mirror 3. The image is formed at the center edge of the precision tracking camera 5. The deflection angle of the monitoring laser is calculated by the precision tracking camera 5 and the control module, and the laser optical axis adjustment mechanism 2 is controlled to correct the angle error, so that the tracking laser optical axis and the optical axis of the precision tracking camera 5 are corrected to a parallel state in real time.

[0040] like Figure 5-8 As shown, in this embodiment, a corner reflector seat 11 for mounting the corner reflector 7 and an optical wedge seat 10 for mounting the optical wedge 8 are also included. The corner reflector seat 11 is designed to be integrated with the double-aperture aperture 9. The optical wedge seat 10 is movably connected to the corner reflector seat 11, for example, a threaded connection can be adopted. A fastener is provided on the optical wedge seat 10 for locking and fixing the optical wedge seat 10. The direction of the inclined surface of the optical wedge can be adjusted by rotating the optical wedge seat, so as to change the deflection angle of the monitoring laser by the deflection direction of the inclined surface, and the fastener is used to lock it after it is adjusted in place.

[0041] In this embodiment, the specific working process is as follows: first, pre-adjustment is performed. Without installing the optical wedge 8, the laser 1 is roughly adjusted, and the laser optical axis adjustment mechanism 2 is finely adjusted, so that the emitted laser transmits the coupling mirror 3 to emit the monitoring laser. After the monitoring laser is reflected by the corner reflector 7 and the coupling mirror 3, the imaging spot of the fine tracking camera 5 is at the center position of the detection surface of the fine tracking camera 5, that is, the optical axis of the monitoring laser that enters the fine tracking camera through the reverse side of the coupling mirror coincides with the optical axis of the fine tracking camera 5 in the initial state, and the angle information of the laser optical axis adjustment mechanism 2 is recorded at this time. Keeping the angle of the laser optical axis adjustment mechanism 2 unchanged, the optical wedge 8 is added to the optical path. At this time, the imaging spot of the monitoring laser in the fine tracking camera 5 will deviate from the center position of the detection surface of the fine tracking camera 5 and deflect by a certain angle, such as about 0.2°. At this time, the field of view of the fine tracking camera 5 is about 0.5°×0.4°. The optical wedge is rotated so that the monitoring spot is at the edge of the field of view of the fine tracking camera 5 and is inside the field of view. The optical wedge is fixed by a fastener and the spot position at this time is recorded as the zero position of the monitoring spot.

[0042] Then the optical axis can be monitored in real time. The emission laser emitted by the laser 1 is first reflected by the laser optical axis adjustment mechanism 2, and then is reflected by the front side of the coupling mirror 3 to emit the tracking laser, and is transmitted by the coupling mirror 3 and then emitted from the back side to emit the monitoring laser. The tracking laser is reflected by the camera optical axis adjustment mechanism 4 and then emitted to the target. The tracking laser reflected by the target and the visible light reflected by the target are reflected by the camera optical axis adjustment mechanism 4, and then are coupled by the front side of the coupling mirror 3 and enter the center of the field of view of the precision tracking camera 5. The monitoring laser first enters the corner reflector 7 through the first hole 901 of the double-aperture aperture 9, and then is reflected by the corner reflector 7 and then emitted through the second hole 902 of the double-aperture aperture 9, and then enters the optical wedge 8 to be deflected in direction, and emits the monitoring laser after the direction is deflected. Alternatively, the monitoring laser first passes through the optical wedge 8 to be deflected in direction, and then enters the corner reflector 7 through the second hole 902 of the double-aperture aperture 9, and then is reflected by the corner reflector 7 and then is emitted through the first hole 901 of the double-aperture aperture 9 to emit the monitoring laser after the direction is deflected. After the direction deflection, the monitoring laser is reflected by the coupling mirror 3 and then enters the fine tracking camera 5 to generate a monitoring spot. When the optical axis of the tracking laser and the optical axis of the fine tracking camera 5 are inconsistent after coupling due to external reasons, the position of the monitoring laser imaging on the fine tracking camera 5 will change. The angle corresponding to a single pixel of the fine tracking camera 5 is about 14μrad. The deflection angle of the monitoring laser can be calculated by detecting the number of pixels of the monitoring spot deviating from the zero position. The angle of the laser optical axis adjustment mechanism 2 deflecting in the opposite direction is half of the deflection angle of the monitoring laser. By calculating the deflection angle of the monitoring laser and controlling the laser optical axis adjustment mechanism 2 to correct the angle error, the optical axis of the tracking laser and the optical axis of the fine tracking camera 5 can be corrected to a parallel state in real time. Since the monitoring spot position is at the edge of the field of view, and the target position is generally at the center of the field of view, the two can be detected at the same time without interfering with each other, so real-time monitoring can be achieved. When the monitoring spot deviates from the zero position, the monitoring spot is returned to the zero position by controlling the laser optical axis adjustment mechanism 2 to deflect in the opposite direction, thereby achieving real-time monitoring and correction of the optical axis. The utility model realizes real-time monitoring of the optical axis. When the optical axis drift is detected, the optical axis can be quickly corrected to ensure the consistency of the optical axis after the optical path coupling, and the monitoring accuracy is high. In addition, the structure is compact, the space occupied is small, and it can work in real time, which greatly improves the stability of project work.

[0043] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

Claims

1. A novel optical axis real-time monitoring device, characterized in that: It includes an optical path component, a control module and a precision tracking camera, wherein the optical path component includes an optical path coupling mechanism and an optical path deflection mechanism, and the optical path coupling mechanism includes a laser optical axis adjustment mechanism and a coupling mirror; The laser optical axis adjustment mechanism is arranged in the optical path of the emitted laser, and the emitted laser enters the coupling mirror after being reflected by the laser optical axis adjustment mechanism; The coupling mirror is arranged on the optical path of the visible light reflected by the external target entering the fine tracking camera for imaging. The front side of the coupling mirror faces the laser optical axis adjustment mechanism, and the back side faces the fine tracking camera. The emission laser entering the coupling mirror is reflected by the front side of the coupling mirror and then emits the tracking laser. The monitoring laser is emitted from the back side after being transmitted by the coupling mirror. The tracking laser is used to emit to the target. The visible light reflected by the target and the tracking laser reflected by the target are both coupled by the front side of the coupling mirror and then transmitted into the fine tracking camera to generate an imaging spot. The optical path deflection mechanism includes a corner reflector, which is located in the monitoring laser optical path on the reverse side of the coupling mirror. An optical wedge is provided in the monitoring laser optical path between the corner reflector and the coupling mirror, and the optical wedge is used to deflect the direction of the monitoring laser. The monitoring laser is deflected in direction after passing through the corner reflector and the optical wedge. After the deflection, the monitoring laser is reflected by the reverse side of the coupling mirror and enters the precision tracking camera to generate a monitoring light spot. The control module is electrically connected to the laser optical axis adjustment mechanism and the precision tracking camera respectively. The control module is used to control the reflection surface angle of the laser optical axis adjustment mechanism to adjust the tracking laser optical axis. The precision tracking camera is used to image, obtain the imaging spot and monitor the position of the spot and output the position information to the control module.

2. The novel optical axis real-time monitoring device according to claim 1 is characterized in that: The optical path component also includes a camera optical axis adjustment mechanism, which is also arranged on the optical path of the visible light reflected by the external target entering the precision tracking camera for imaging, and the camera optical axis adjustment mechanism is located on the front side of the coupling mirror. The visible light reflected by the target and the tracking laser reflected by the target are both reflected by the camera optical axis adjustment mechanism and then coupled through the front side of the coupling mirror. The camera optical axis adjustment mechanism is electrically connected to the control module, and is used to adjust the angle of the reflection surface under the control of the control module to adjust the optical axis of the precision tracking camera.

3. The novel optical axis real-time monitoring device according to claim 1 is characterized in that: A double-aperture aperture is arranged between the corner reflector and the optical wedge, and the first aperture and the second aperture of the double-aperture aperture are symmetrical along the center of the corner reflector axis.

4. The novel optical axis real-time monitoring device according to claim 1 is characterized in that: The inclined surface of the optical wedge is arranged on a side away from the reflecting surface of the corner reflector.

5. The novel optical axis real-time monitoring device according to claim 2 is characterized in that: The camera optical axis adjustment mechanism adopts a fast reflection mirror.

6. The novel optical axis real-time monitoring device according to claim 1 is characterized in that: The laser optical axis adjustment mechanism adopts an electric adjustment mirror.

7. The novel optical axis real-time monitoring device according to claim 3 is characterized in that: It also includes a corner reflector seat for installing the corner reflector and an optical wedge seat for installing the optical wedge. The corner reflector seat is integrated with the double-aperture aperture, and the optical wedge seat is movably connected to the corner reflector seat.

8. The novel optical axis real-time monitoring device according to claim 7 is characterized in that: The optical wedge seat and the corner reflector seat are connected by threads.

9. The novel optical axis real-time monitoring device according to claim 7 is characterized in that: The optical wedge seat is provided with a fastener for locking and fixing the optical wedge seat.

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