Receiving and transmitting coaxial adjusting structure of laser ceilometer

Abstract

The utility model relates to a receiving and transmitting coaxial adjusting structure of a laser ceilometer, which comprises a fixed support used for integrally supporting and connecting with an external structure. A first rotating mechanism and a second rotating mechanism which are symmetrical and coaxially distributed along an optical axis are arranged in the fixed support, are the same and respectively comprise a bearing, a lens seat and an optical lens; two adjusting holes are formed in the fixed support, detachable fastening screws are arranged in the adjusting holes in a matched mode, and the lens base is fixed from the outside through the fastening screws to rotate and move; according to the utility model, the first rotating mechanism and the second rotating mechanism which are coaxial and symmetrically distributed are arranged, and the two rotating mechanisms can respectively rotate to adjust the positions of respective wedge-shaped optical lenses, so that the effect of coaxial receiving and transmitting of an optical path can be realized; the two wedge-shaped optical lenses are matched for use, so that light beam incidence can generate a deflection angle of 0-4 degrees, and echo signals can be captured.

Description

Technical Field

[0001] The utility model relates to the technical field of optical measurement, and particularly relates to a coaxial transceiver adjustment structure for a lidar ceilometer. Background Art

[0002] A lidar ceilometer is a meteorological device for monitoring cloud bases and cloud heights, providing important reference data for meteorological big data models, weather forecasts, etc. The lidar ceilometer mainly utilizes the principle of atmospheric scattering. When in use, a laser beam is emitted from the ground upwards into the sky, and atmospheric aerosols perform backscattering on the laser beam. By receiving the echo signals of the backscattering, the composition of the atmosphere at different heights is detected and analyzed, thereby obtaining cloud height, cloud thickness, number of cloud layers, visibility, etc. The stable and reliable operation of the ceilometer is an important assessment index of the device, and the structural design of the coaxial transceiver of the ceilometer optical path is the key factor to ensure the stable and reliable operation of the device.

[0003] In the prior art, an optical pitching bracket is used to adjust the reflection direction of the lens through a fine-threaded screw with a pitch of 0.2 mm - 0.25 mm, so as to achieve coaxial transceiver of the optical path. This solution has the following defects: (1) The adjustment range of the fine-threaded screw pitching bracket is very narrow. Only within a range less than 1 / 8 turn (45°) or even 1 / 16 turn can an effective signal be captured, and an optimal position needs to be found within this interval, which is very difficult for the optical path alignment. Restricted by the mechanical processing accuracy and the stability requirements of the pitching bracket, the pitch of the fine-threaded screw cannot be infinitely compressed. Currently, 0.2 mm - 0.25 mm is already a relatively appropriate parameter considering both stability and adjustment fineness; (2) The structure of the fine-threaded screw pitching bracket is asymmetric. During the process of environmental temperature change, due to the difference in the coefficient of thermal expansion of materials, the asymmetry of the pitching bracket structure will cause the optical axis of the transceiver optical path to deviate from the expected angle, which requires readjusting the optical path to meet coaxial transceiver. When the environmental temperature changes, it needs to be adjusted again. This requires a large amount of investment in daily operation and maintenance, and due to the difference in the proficiency of operators, there will be a large difference in the performance of the device.

[0004] Therefore, it is necessary to design a new adjustment mechanism to replace the pitching bracket for adjusting the coaxial transceiver of the optical path. Summary of the Utility Model

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a coaxial transceiver adjustment structure for a lidar ceilometer, which is used to solve the problems of narrow adjustment range and asymmetry existing in the prior art when using a pitching bracket to adjust the coaxial transceiver of the optical path.

[0006] To achieve the above object and other related objects, the present utility model provides a coaxial transceiver adjustment structure for a lidar ceilometer, including a fixed support, and the fixed support is used for overall support and connection with an external structure;

[0007] The fixed support is provided with a first rotating mechanism and a second rotating mechanism that are symmetric and coaxially distributed along the optical axis. The first rotating mechanism and the second rotating mechanism are the same mechanisms, and both include:

[0008] a bearing, the outer ring of the bearing is movably connected to the fixed support;

[0009] a lens holder, the lens holder is installed in the inner ring of the bearing, and realizes rotatable assembly relative to the fixed support through the bearing;

[0010] an optical lens, the optical lens is installed in the lens holder;

[0011] The fixed support is provided with two adjusting holes. The lens holders of the first rotating mechanism and the second rotating mechanism are both provided with positioning holes that penetrate the corresponding adjusting holes. A detachable fastening screw is fitted in the adjusting hole, and the fastening screw is inserted into the adjusting hole from the outside to fix the rotational movement of the lens holder.

[0012] In an embodiment of the present invention, the optical lens is provided as a symmetric wedge structure, and there is an angle of 1° between both sides of the wedge-shaped optical lens and the plane perpendicular to the optical axis.

[0013] In an embodiment of the present invention, the optical lenses of the first rotating mechanism and the second rotating mechanism are serially combined in the fixed support, so that the deflection angle of the light beam varies between 0° and 4°.

[0014] In an embodiment of the present invention, the rotation adjustment angle range of the first rotating mechanism and the second rotating mechanism is 0-360°.

[0015] In an embodiment of the present invention, both opposite sides of the lens holder are provided with fixing holes, and locking screws are fitted in the fixing holes. The heads of the locking screws abut against the outer edge of the optical lens, and the optical lens is locked relative to the lens holder through the locking screws.

[0016] In an embodiment of the present invention, the lens holder includes a main body and a boss. The diameter of the boss is smaller than the diameter of the main body. The optical lens is installed on the boss, and the inner ring of the bearing is connected to the main body.

[0017] In an embodiment of the present invention, an assembly groove is provided in the main body.

[0018] In an embodiment of the present invention, there are multiple positioning holes, and the multiple positioning holes are equidistantly arranged in a ring on the main body.

[0019] As described above, the coaxial transceiver adjustment structure of the laser ceilometer of the present invention has the following beneficial effects:

[0020] 1. The utility model realizes the coaxial effect of optical path transceiver by setting the first rotation mechanism and the second rotation mechanism which are coaxial and symmetrically distributed. The two rotation mechanisms can respectively rotate 360 degrees to adjust the positions of their respective wedge-shaped optical lenses. When the optical axes of the two optical lenses coincide, the coaxial effect of the optical path can be achieved. Both rotation mechanisms are adjusted by bearings, with flexible adjustment, enabling the best coaxiality and quadrant uniformity. The design of the symmetric rotation mechanism can eliminate the optical path deflection problems caused by thermal expansion and contraction and structural asymmetry, making the optical path stability of the product better when operating in high and low temperature environments.

[0021] 2. Due to the existence of the wedge angle, each optical lens of the wedge-shaped optical lens has a range greater than 90° to capture the echo signal, improving the capture effect of the echo signal. The cooperation of the two wedge-shaped optical lenses can cause the incident beam to deflect by an angle of 0° to 4°, enabling the captured echo signal beyond 90° to be coaxial with the emission optical path through deflection, improving the transmission effect of the beam signal, and further improving the use effect of the laser ceilometer. Brief Description of the Drawings

[0022] Figure 1 It shows a schematic diagram of the external structure of the utility model.

[0023] Figure 2 It shows a schematic diagram of the disassembled structure of the utility model.

[0024] Figure 3 It shows a schematic diagram of the sectional structure of the utility model.

[0025] Figure 4 It shows a schematic diagram of the structure of the lens holder assembling the optical lens in Embodiment 1.

[0026] Figure 5 It shows a schematic diagram of the structure of the lens holder assembling the optical lens in Embodiment 2.

[0027] Figure 6 It shows a schematic diagram of the incident beam being offset from coaxial by the wedge of the optical lens.

[0028] Explanation of Component Labels

[0029] Fixed support 1; Adjusting hole 11; Bearing 2; Lens holder 3; Main body 31; Assembly groove 311; Boss 32; Fixed hole 33; Positioning hole 34; Optical lens 4; Fastening screw 5; Locking screw 6. Detailed Embodiment

[0030] The following specific embodiments illustrate the implementation manners of the utility model. Those skilled in the art can easily understand the other advantages and effects of the utility model from the content disclosed in this specification.

[0031] Please refer toFigures 1 to 6 It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the efficacy that this utility model can produce and the purpose that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope for the implementation of this utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope within which this utility model can be implemented.

[0032] Please refer to Figures 1-4 , this utility model provides a coaxial adjustment structure for the transceiver of a laser ceilometer, including a fixed support 1, and the fixed support 1 is used for the overall support and connection with an external structure; symmetric and coaxially distributed first and second rotating mechanisms are provided in the fixed support 1. The first and second rotating mechanisms are the same mechanism, and both include a bearing 2, a lens holder 3, and an optical lens 4. The outer ring of the bearing 2 is movably connected to the fixed support 1; the lens holder 3 is installed in the inner ring of the bearing 2 and is rotatably assembled relative to the fixed support 1 through the bearing 2; the optical lens 4 is installed in the lens holder 3; two adjustment holes 11 are provided on the fixed support 1, and positioning holes 34 penetrating the corresponding adjustment holes are provided on the lens holders 3 of the first and second rotating mechanisms. A detachable fastening screw 5 is fitted in the adjustment hole 11. After adjusting the optical lens 4 to an appropriate angle by rotating the lens holder 3, the fastening screw 5 is placed into the positioning hole 34 from the outside into the adjustment hole 11 to fix the rotational movement of the lens holder 3. The rotational adjustment angle range of the first and second rotating mechanisms is 0 - 360°, and a large-range adjustment of the optical axis can be achieved. By providing the first and second rotating mechanisms that are coaxial and symmetrically distributed, the two rotating mechanisms can respectively rotate 360 degrees to adjust the positions of their respective wedge-shaped optical lenses 4. When the optical axes of the two optical lenses 4 coincide, the effect of coaxial transceiver of the optical path can be achieved; both of the two rotating mechanisms are rotationally adjusted through the bearing 2, with flexible adjustment, and the best coaxiality and quadrant uniformity can be achieved; the design of the symmetric rotating mechanism can eliminate the optical path deflection problems caused by thermal expansion and contraction and structural asymmetry, making the optical path stability of the product better when operating in high and low temperature environments.

[0033] Please refer to Figure 6 , Figure 6In this, a is the optical axis and b is the incident light beam; the optical lens 4 is designed as a symmetric wedge structure, and there is an angle of 1° between both sides of the wedge-shaped optical lens 4 and the plane perpendicular to the optical axis. A single optical lens can cause a 2° deflection of the light beam; the optical lenses 4 of the first rotation mechanism and the second rotation mechanism are connected in series in the fixed support 1, so that the deflection angle of the light beam varies between 0° and 4°. Due to the existence of the wedge angle of the wedge-shaped optical lens 4, each optical lens 4 has a range greater than 90° to capture the echo signal, improving the capture effect of the echo signal; the use of two wedge-shaped optical lenses 4 in cooperation can cause a deflection angle of 0° to 4° when the light beam is incident, enabling the echo signal outside 90° captured to be coaxial with the emission optical path through deflection, improving the transmission effect of the light beam signal, and further improving the use effect of the laser ceilometer.

[0034] The lens holder 3 includes a main body 31 and a boss 32. The diameter of the boss 32 is smaller than that of the main body 31. The optical lens 4 is mounted on the boss 32. The inner ring of the bearing 2 is connected to the main body 31. At the same time, a positioning hole 34 is also provided on the main body 31; and there are multiple positioning holes 34, and the multiple positioning holes 34 are equidistantly arranged in a ring on the main body 31, facilitating the insertion and locking of the fastening screw 5 after rotation adjustment. Fixed holes 33 are provided on both opposite sides of the lens holder 3, and locking screws 6 are fitted in the fixed holes. The head of the locking screw 6 passes through the boss and abuts against the outer edge of the optical lens 4, locking the optical lens 4 relative to the lens holder 3 through the locking screw 6; the assembly of the optical lens 4 is convenient and has good reliability.

[0035] Example 2, please refer to Figure 5 , based on Example 1, an assembly groove 311 is provided in the main body 31, and the optical lens 4 can also be embedded in the assembly groove 311 of the main body 31. At this time, glue is applied to the edge of the optical lens 4 for bonding, and there is no need to lock with the locking screw 6.

[0036] In summary, the present utility model realizes the effect of coaxial optical path transmission and reception by setting the first rotation mechanism and the second rotation mechanism that are coaxial and symmetrically distributed. The two rotation mechanisms can respectively rotate 360 degrees to adjust the positions of their respective wedge-shaped optical lenses 4; the use of two wedge-shaped optical lenses 4 in cooperation can cause a deflection angle of 0° to 4° when the light beam is incident, which is conducive to capturing the echo signal; the design of the symmetric rotation mechanism can eliminate the optical path deflection problem caused by thermal expansion and contraction and structural asymmetry, making the optical path stability of the product better when operating in high and low temperature environments. Therefore, the present utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0037] The above embodiments are only illustrative of the principles and effects of the present utility model and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A coaxial adjustment structure for the transceiver of a lidar, comprising a fixed support, which is used for the overall support and connection with an external structure; It is characterized in that: The fixed support is provided with a first rotating mechanism and a second rotating mechanism that are symmetrically and coaxially distributed along the optical axis. The first rotating mechanism and the second rotating mechanism are the same mechanism, and both include: A bearing, the outer ring of which is movably connected to the fixed support; A lens holder, which is installed in the inner ring of the bearing and is rotatably assembled relative to the fixed support through the bearing; An optical lens, which is installed in the lens holder; Two adjustment holes are provided on the fixed support, and positioning holes penetrating the corresponding adjustment holes are provided on the lens holders of the first rotating mechanism and the second rotating mechanism. A detachable fastening screw is fitted in the adjustment hole, and the fastening screw is inserted into the adjustment hole from the outside to fix the rotational movement of the lens holder.

2. The coaxial adjustment structure for transmitting and receiving of the laser ceilometer according to claim 1, wherein: The optical lens is provided as a symmetric wedge structure, and there is an angle of 1° between both sides of the wedge-shaped optical lens and the vertical plane of the optical axis.

3. The coaxial adjustment structure for transmitting and receiving of the laser ceilometer according to claim 2, characterized in that: The optical lenses of the first rotating mechanism and the second rotating mechanism are serially combined in the fixed support, so that the beam deflection angle changes between 0° and 4°.

4. The coaxial adjustment structure for transmitting and receiving of the laser ceilometer according to claim 1, characterized in that: The rotation adjustment angle range of the first rotating mechanism and the second rotating mechanism is 0 - 360°.

5. The coaxial adjustment structure for transmitting and receiving of the laser ceilometer according to claim 1, characterized in that: Fixing holes are provided on both opposite sides of the lens holder, and locking screws are fitted in the fixing holes. The heads of the locking screws abut against the outer edge of the optical lens, and the optical lens is locked relative to the lens holder through the locking screws.

6. The coaxial adjustment structure for the transceiver of the lidar ceilometer according to claim 1, characterized in that: The lens holder includes a main body and a boss. The diameter of the boss is smaller than that of the main body. The optical lens is installed on the boss, the inner ring of the bearing is connected to the main body, and the positioning hole is also provided on the main body.

7. The coaxial adjustment structure for transmitting and receiving of the laser ceilometer according to claim 6, wherein: An assembly groove is provided in the main body.

8. The coaxial transceiver adjustment structure of the laser ceilometer according to claim 6, wherein: A plurality of positioning holes are provided, and the plurality of positioning holes are equidistantly arranged in a ring on the main body.

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