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Vehicle laser Doppler velocimeter based on scanning galvanometer

A Doppler velocimeter and Doppler velocimetry technology, which is applied in the direction of instruments, measuring devices, electromagnetic wave re-radiation, etc., can solve problems such as changes in the inclination angle of laser emission

Active Publication Date: 2019-03-01
湖南波恩光电科技有限责任公司
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  • Claims
  • Application Information

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Problems solved by technology

[0024] There are inherent defects in existing speedometers with various structures, especially for the shortcomings of the existing reference beam type laser Doppler speedometers when they are applied to vehicle-mounted systems.

Method used

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  • Vehicle laser Doppler velocimeter based on scanning galvanometer
  • Vehicle laser Doppler velocimeter based on scanning galvanometer
  • Vehicle laser Doppler velocimeter based on scanning galvanometer

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Embodiment Construction

[0070] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention, and further detailed descriptions will be given, but the embodiments of the present invention are not limited thereto.

[0071] refer to figure 1 , the reference beam type laser Doppler velocimeter is installed on the vehicle, when the vehicle is running on a flat ground (that is, the ground level), when running smoothly, the emission of the reference beam type laser Doppler velocimeter installed on the vehicle The inclination does not change and the angle is θ.

[0072] refer to figure 2 , the reference beam type laser Doppler velocimeter is installed on the vehicle, when the vehicle is driving on the undulating and bumpy road, the emission inclination of the reference beam type laser Doppler velocimeter installed on the vehicle changes, and the variation of the em...

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Abstract

A vehicle laser Doppler velocimeter based on a scanning galvanometer comprises a reference beam type laser Doppler velocity measurement probe, a coaxial cable, a signal processing unit and a display screen, and a scanning galvanometer is arranged on a laser path before a laser of the reference beam type laser Doppler velocity measurement probe is incident to the ground. The scanning galvanometer is provided with a first working position and a second working position. When the scanning galvanometer is located at the first working position, the laser of the reference beam type laser Doppler velocity measurement probe is directly incident to the ground; and when the scanning galvanometer is located at the second working position, the laser of the reference beam type laser Doppler velocity measurement probe is incident onto the scanning galvanometer, the laser reflected by the scanning galvanometer is incident to the ground. According to two Doppler frequencies measured when the scanning galvanometer is rotated to the first working position and the second working position, the variation of the emission inclination angle can be calculated to obtain the motion speed of the vehicle and eliminate the influence of the emission inclination angle variation on the velocity measurement precision when the vehicle is bumped.

Description

technical field [0001] The invention relates to the technical field of laser speed measurement, in particular to a vehicle-mounted laser Doppler speed measurement instrument. Background technique [0002] The basic principle of the laser Doppler velocimeter is: when a beam of laser light is incident on a relatively moving object, the frequency of the scattered light is different from the frequency of the incident light, and the difference between the two is the Doppler frequency, which is related to the moving speed of the object. Proportional, so the speed of the object can be measured by detecting the Doppler frequency. [0003] Installing the laser Doppler speedometer on the vehicle can provide accurate real-time speed parameters for the vehicle. There are three common measurement modes of laser Doppler velocimeters: reference light mode, self-mixing mode and dual-beam differential mode. [0004] At present, the dual-beam differential laser Doppler technology is relativ...

Claims

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Application Information

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IPC IPC(8): G01S17/58G01S7/481
CPCG01S7/4811G01S7/4817G01S17/58
Inventor 陈鹏
Owner 湖南波恩光电科技有限责任公司
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