Close-distance blind compensation focus-adjustable laser wind measurement optical antenna

Abstract

The utility model discloses a focus-adjustable laser wind measurement optical antenna for close-range blind compensation, which comprises a telescope group and an optical fiber head, the optical fiber head is connected with the bottom of the telescope group, and a steering engine assembly is arranged between the telescope group and the optical fiber head and is used for switching slides; a connecting plate is arranged at the top of the telescope, a transmission assembly is fixed on the connecting plate, and the transmission assembly is connected with a wedge-shaped mirror assembly through a transmission shaft; compared with the prior art, wide-narrow pulse switching work is adopted, long-distance detection is achieved through wide pulses, short-distance detection is achieved through narrow pulses, detection of the whole measuring range is achieved by splicing long-distance data and short-distance data through an algorithm, and therefore detection blind areas are reduced.

Description

Technical Field

[0001] The utility model relates to the field of laser radar, in particular to a close-range blind spot-filling and focus-adjustable laser wind measurement optical antenna. Background Art

[0002] In the field of laser wind radar, wind radar can obtain radial wind speeds in different directions through laser beams emitted at multiple angles based on the Doppler effect of laser, and obtain atmospheric wind field information through wind speed synthesis. This technical solution uses a wedge-shaped mirror to deflect the original optical path, and drives the wedge-shaped mirror to rotate through a frameless torque motor to change the azimuth angle, obtain radial winds in different directions, and thus synthesize wind speeds to obtain three-dimensional wind field information.

[0003] According to the characteristics of optical telescopes, the echo signal-to-noise ratio is the largest at the focal length of the telescope. In order to ensure the longest detection distance and close-range detection, and at the same time ensure that the echo signal-to-noise ratio meets the wind speed synthesis conditions, the telescope has an adjustable focus function. The telescope uses a servo to rotate and drive the dielectric glass slide, adding dielectric glass slides with different refractive indices to the original optical path, changing the equivalent optical path between the laser source and the lens group, that is, changing the convergence distance of the laser, and ultimately achieving the purpose of improving the signal-to-noise ratio of the target point.

[0004] China Patent Authorization Publication Number: CN215297681U, Authorization Publication Date: December 24, 2021, the utility model named "Variable Focus High Signal-to-Noise Ratio Wind Measurement Lidar System" discloses a variable focus high signal-to-noise ratio wind measurement Lidar system, which includes an optical antenna, the optical antenna includes a control switch and multiple groups of zoom lenses respectively connected to and controlled by the control switch, and each group of zoom lenses faces a different direction. That is, the detection laser emission angle of each group of zoom lenses is different; the patent controls the detection laser to switch back and forth between each group of zoom lenses by controlling the switch, and changes the focal length by adjusting the distance between the zoom lenses, so that the spatial distribution of the detection laser intensity changes. Using this technology to detect wind field information at different distances, the zoom lens has both the advantages of adding multiple telescope lenses, which will increase the overall volume and weight of the Lidar, which is not conducive to handling and transportation, and has a high manufacturing cost. In addition, the distance between the zoom lenses cannot be tightly guaranteed by adjusting the distance between the zoom lenses. Whether it is manual adjustment or electric adjustment, the adjustment accuracy requirements are very high. Utility Model Content

[0005] The purpose of the utility model is to propose a close-range blind spot adjustable laser wind measurement optical antenna, which is aimed at the existing variable focus high signal-to-noise ratio wind measurement laser radar system, which is large in size and heavy in weight, is not conducive to handling and transportation, has a high manufacturing cost, and cannot be closely guaranteed by adjusting the distance between the zoom lenses, and whether it is manual adjustment or electric adjustment, the adjustment accuracy requirement is very high. In view of this deficiency, a close-range blind spot adjustable laser wind measurement optical antenna is proposed.

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

[0007] A focus-adjustable laser wind measurement optical antenna for short-range blind spot filling comprises a telescope group and an optical fiber head, wherein the optical fiber head is connected to the bottom of the telescope group, a steering gear assembly is arranged between the telescope group and the optical fiber head for switching glass slides; a connecting plate is arranged on the top of the telescope, a transmission assembly is fixed on the connecting plate, and a wedge mirror assembly is installed on the transmission assembly via a transmission shaft.

[0008] As a further preferred embodiment of the present invention, the servo assembly includes a servo and a slide switching board, the slide switching board is provided with a plurality of slide slots for installing different slides, and the servo is fixed to the telescope by screws.

[0009] As a further preferred embodiment of the present invention, the glass slide is fixed in the glass slide groove by gluing.

[0010] As a further preferred embodiment of the present invention, the transmission assembly includes a motor base, a motor stator and a motor rotor, the motor stator is fixed in the motor base by screws, and the motor rotor is connected to the transmission shaft by gluing.

[0011] As a further preferred embodiment of the present invention, a rotor pressing ring is fixed by threads on one end of the transmission shaft close to the motor rotor, so as to press the motor rotor and the transmission shaft tightly.

[0012] As a further preferred embodiment of the present invention, the wedge mirror assembly includes a wedge mirror and a wedge mirror seat, the wedge mirror is fixed to the wedge mirror seat by gluing, and the wedge mirror seat is connected to the transmission shaft by bolts.

[0013] As a further preferred embodiment of the present invention, a deep groove ball bearing is arranged between the transmission shaft and the motor seat, a bearing pressure ring is arranged above the deep groove ball bearing, and the bearing pressure ring is fixedly connected to the motor seat for fixing the deep groove ball bearing.

[0014] As a further preferred embodiment of the present invention, an encoder is further included, and the encoder is fixed to the bottom of the motor base by screws.

[0015] The utility model provides a close-range blind spot-filling adjustable focus laser wind measurement optical antenna, which has the following beneficial effects compared with the prior art:

[0016] 1. The utility model separates the focusing device from the telescope, so that the glass slide is as close to the fiber head as possible; when the diameter of the glass slide is much larger than the diameter of the light path through the glass slide, the slight jitter or deviation or error of the steering gear will not affect or directly affect the adjustment of the focal distance, making the focusing more stable and reliable;

[0017] 2. By setting up a slide switching plate, it is possible to prevent multiple different slides and improve the efficiency of slide replacement;

[0018] 3. The utility model adopts wide-narrow pulse switching to achieve long-distance detection with wide pulse and short-distance detection with narrow pulse. Finally, the algorithm is used to splice the long-distance and short-distance data to achieve the detection of the entire range, thereby reducing the detection blind area.

[0019] 4. The multi-lens mode is controlled by rotating the wedge mirror instead of the transmission control switch, which improves the performance of the wind measurement equipment while reducing the overall weight of the equipment and the internal volume of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a front cross-sectional view of the utility model.

[0021] Figure 2 It is an oblique axonometric schematic diagram of the utility model.

[0022] Figure 3 It is a schematic diagram of glass switching of the steering gear of the utility model.

[0023] The meanings of the reference numerals in the figure are: 1. wedge mirror; 2. wedge mirror seat; 3. deep groove ball bearing; 4. motor seat; 5. motor stator; 6. motor rotor; 7. transmission shaft; 8. optical fiber head; 9. servo assembly; 91. servo; 92. slide switching plate; 93. slide slot; 10. telescope assembly; 11. rotor pressure ring; 12. connecting plate; 13. encoder; 14. bearing pressure ring. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Embodiment 1: Combination Figure 1-3 A focusable laser wind measurement optical antenna for short-range blind spot filling includes a telescope group 10 and an optical fiber head 8, wherein the optical fiber head 8 is connected to the bottom of the telescope group 10, and a steering gear assembly 9 is arranged between the telescope group 10 and the optical fiber head 8 for switching glass slides; the steering gear assembly 9 includes a steering gear 91 and a glass slide switching plate 92, wherein the steering gear 91 is fixed to the telescope by screws, and the glass slide switching plate 92 is provided with a plurality of glass slide grooves 93 for installing different glass slides, and the glass slides are fixed in the glass slide grooves 93 by gluing; the swing arc of the center of the glass slide groove 93 passes through the optical axis center of the telescope group 10; the steering gear 91 drives the glass slide to rotate to realize the switching of the glass slide, that is, the switching between the narrow pulse width and the wide pulse is performed.

[0026] A connecting plate 12 is provided on the top of the telescope, and a transmission assembly is fixed on the connecting plate 12, and the transmission assembly includes a motor seat 4, a motor stator 5 and a motor rotor 6, the motor stator 5 is fixed in the motor seat 4 by screws, and the motor rotor 6 is connected to the transmission shaft 7 by gluing, and the transmission shaft 7 is fixed with a rotor pressing ring 11 by threads at one end close to the motor rotor 6, which is used to press the motor rotor 6 and the transmission shaft 7; the transmission assembly is connected and installed with a wedge mirror 1 assembly through the transmission shaft 7, and the wedge mirror 1 assembly includes a wedge mirror 1 and a wedge mirror seat 2, the wedge mirror 1 is fixed on the wedge mirror seat 2 by gluing, and the wedge mirror seat 2 is connected to the transmission shaft 7 by bolts, and a deep groove ball bearing 3 is arranged between the transmission shaft 7 and the motor seat 4, and a bearing pressure ring 14 is arranged above the deep groove ball bearing 3, and the bearing pressure ring 14 is fixedly connected to the motor seat 4 for fixing the deep groove ball bearing 3; and an encoder 13 is also included, and the encoder 13 is fixed to the bottom of the motor seat 4 by screws.

[0027] Embodiment 2: The servo 91 drives the slide rotating plate to switch the slide A to the center of the optical axis, switches the pulse width to a wide pulse, and the light emitted by the optical fiber head 8 is collimated by the slide A and the telescope group 10 and then emitted to the atmosphere through the wedge mirror 1. The wedge mirror 1 is controlled to rotate in four directions by the torque motor rotor 6, 90° in each direction. After rotating 360°, the pulse width is switched to a narrow pulse, and the servo 91 drives the slide B to switch to the center of the optical axis. The light emitted by the optical fiber head 8 is collimated by the slide B and the telescope group 10 and then emitted to the atmosphere through the wedge mirror 1. The wedge mirror 1 is controlled to rotate in four directions by the torque motor rotor 6, 90° in each direction. After rotating 360°, a set of data collection is completed. Cycle in sequence. The two segments of data measured by the wide pulse and the narrow pulse are fused and output to obtain full-scale wind field information.

[0028] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A close-range blind spot-filling adjustable focus laser wind measurement optical antenna, comprising a telescope assembly (10) and an optical fiber head (8), wherein the optical fiber head (8) is connected to the bottom of the telescope assembly (10), and is characterized in that: A steering gear assembly (9) is provided between the telescope group (10) and the optical fiber head (8) for switching glass slides; a connecting plate (12) is provided on the top of the telescope, a transmission assembly is fixed on the connecting plate (12), and the transmission assembly is connected and installed with a wedge mirror (1) assembly via a transmission shaft (7).

2. The focus-adjustable laser wind measurement optical antenna for close-range blindness compensation according to claim 1, characterized in that: The steering gear assembly (9) comprises a steering gear (91) and a glass slide switching plate (92); the glass slide switching plate (92) is provided with a plurality of glass slide slots (93) for installing different glass slides; and the steering gear (91) is fixed to the telescope by screws.

3. The focus-adjustable laser wind measurement optical antenna for short-range blind spot compensation according to claim 2, characterized in that: The glass slide is fixed in the glass slide groove (93) by gluing.

4. The focus-adjustable laser wind measurement optical antenna for short-range blind spot compensation according to claim 1, characterized in that: The transmission assembly comprises a motor base (4), a motor stator (5) and a motor rotor (6); the motor stator (5) is fixed in the motor base (4) by means of screws, and the motor rotor (6) is connected to the transmission shaft (7) by means of gluing.

5. The close-range blind spot-filling adjustable focus laser wind measurement optical antenna according to claim 4, characterized in that: A rotor pressing ring (11) is fixed via threads at one end of the transmission shaft (7) close to the motor rotor (6) and is used to press the motor rotor (6) and the transmission shaft (7).

6. The close-range blind spot-filling adjustable focus laser wind measurement optical antenna according to claim 4, characterized in that: The wedge mirror (1) assembly comprises a wedge mirror (1) and a wedge mirror seat (2); the wedge mirror (1) is fixed to the wedge mirror seat (2) by gluing, and the wedge mirror seat (2) is connected to a transmission shaft (7) by bolts.

7. The focus-adjustable laser wind measurement optical antenna for short-range blind spot compensation according to claim 6, characterized in that: A deep groove ball bearing (3) is arranged between the transmission shaft (7) and the motor seat (4), a bearing pressure ring (14) is arranged above the deep groove ball bearing (3), and the bearing pressure ring (14) is fixedly connected to the motor seat (4) and is used to fix the deep groove ball bearing (3).

8. The close-range blind spot-filling adjustable focus laser wind measurement optical antenna according to claim 4, characterized in that: It also includes an encoder (13), wherein the encoder (13) is fixed to the bottom of the motor base (4) by means of screws.

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