Light splitting apparatus of wind detection laser radar based on dual-edge detection

A technology of wind-measuring laser radar and spectroscopic device, which is applied in the field of atmospheric detection, can solve the problems such as the difficulty in adjusting the small angle between two beams of incident light, and achieve the effects of easy control, simple operation, and cost reduction

Inactive Publication Date: 2009-02-18
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing angle tuning technology is difficult to adjust the small angle between the two incident lights of a single etalon, and to provide a spectroscopic device for wind-measuring lidar based on double-edge detection

Method used

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  • Light splitting apparatus of wind detection laser radar based on dual-edge detection
  • Light splitting apparatus of wind detection laser radar based on dual-edge detection
  • Light splitting apparatus of wind detection laser radar based on dual-edge detection

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specific Embodiment approach 1

[0016] Specific implementation mode one: the following combination figure 2 , image 3 Describe this embodiment, this embodiment comprises dichroic prism 1, and dichroic prism 1 comprises the incident surface 1-1 of coating anti-reflection film, the first exit surface 1-2 of coating transflective film, the second surface 1-2 of coating anti-reflection film. The output surface 1-3 and the total reflection surface 1-4 coated with the total reflection film, the incident beam L 1 Incident to the first exit surface 1-2 through the incident surface 1-1 along the preset minimum deflection angle and divided into two beams of light, the two beams of light are the first exit light beam L refracted by the first exit surface 1-2 2 And the semi-reflected light beam L reflected by the first exit surface 1-2 4 , the semi-reflected beam L 4 Incident to the total reflection surface 1-4, and reflected by the total reflection surface 1-4 to the second exit surface 1-3, and then refracted to ...

specific Embodiment approach 2

[0030] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the dichroic prism 1 is made of optical glass, such as K9 glass, quartz optical glass, etc., and other compositions and connection methods are the same as Embodiment 1.

specific Embodiment approach 3

[0031] Embodiment 3: This embodiment differs from Embodiment 1 in that the preset minimum deflection angle is within the range of the minimum deflection angle ±0.1 rad, and other components and connection methods are the same as Embodiment 1.

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Abstract

Disclosed is an optical splitter of a wind-detecting lidar which is based on the double-edge technique, and the device belongs to the atmosphere detection technology field. The purpose of the device is to solve the problem that the current angle tuning technique can not perfectly control the small angle of two incoming optical beams of the single etalon. The optical splitting prism comprises an incident face with an antireflection coating, a first exit facet with a translucent coating, a second exit facet with an antireflection coating, and a fully reflecting surface with a perfect reflection coating. The incoming optical beam is divided into two beams by the incidence optical splitting prism along the preset minimum deviation angle, one beam is refracted to form a first exited optical beam by the first exit face, and the other beam can be reflected to form a second exited optical beam by the fully reflecting surface and the second exit face, the incident face and the second exit face are arranged in parallel, the two angles of Alpha and Beta of the light splitting prism meet the preset equations set. The device has simple structure, simple operation, easy control and low cost, improves the current angle tuning technique, and the angle tuning precision can be improved by 1 to 2 orders of magnitude.

Description

technical field [0001] The invention relates to a spectroscopic device of a wind-measuring laser radar based on double-edge detection, and belongs to the technical field of atmospheric detection. Background technique [0002] At present, streak imaging technology and edge technology are mainly used in direct detection Doppler wind lidar. The fringe technology mainly obtains the Doppler frequency shift by detecting the movement of the interference fringes. The system is relatively complicated and the cost is expensive; the edge technology uses a sideband filter with a known transmittance curve to convert the change of the laser frequency into light intensity. The frequency information can be obtained by detecting the change of the laser light intensity, and then the speed can be measured by using the Doppler frequency shift principle. The edge technology is mainly divided into single edge and double edge technology. The double edge technology has better detection accuracy tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/481G01S17/95
CPCY02A90/10
Inventor 任德明赵卫疆宋宝安曲彦臣张合勇钱黎明陈振雷胡孝勇
Owner HARBIN INST OF TECH
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