Laser radar scanning galvanometer three-dimensional angle measuring device and method

A technology of angle measurement device and scanning galvanometer, which is applied in the direction of measurement device, optical device, radio wave measurement system, etc., can solve the problem of limited measurement accuracy of laser radar, and achieve the effect of avoiding the influence of external load and high measurement accuracy

Inactive Publication Date: 2020-11-24
ZHEJIANG UNIV
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Problems solved by technology

[0005] In order to overcome the problem of limited measurement accuracy of laser radar due to the use of contact measurement methods such as capacitive angular displacement sensors in the prior art, the present invention provides a three-dimensional angle measureme

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  • Laser radar scanning galvanometer three-dimensional angle measuring device and method
  • Laser radar scanning galvanometer three-dimensional angle measuring device and method
  • Laser radar scanning galvanometer three-dimensional angle measuring device and method

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Embodiment Construction

[0020] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0021] Lidar can detect space targets within a certain range, and it has relatively high distance measurement and angle measurement resolution. The working principle of distance measurement is generally based on the time-of-flight method or phase method. The flight distance of the laser within the wave signal time measures the distance between the laser radar and the target object; the angle measurement generally uses the angular position sensor to measure the deflection angle of the laser radar scanning galvanometer. At the same time, the distance and angle of the target object relative to the laser radar can be determined to accurately determine the target object.

[0022] figure 1 It is a schematic diagram of the principle of a laser radar, and the laser radar includes: a laser 1 , a collimating lens 2 , a beam splitting prism 3 , a focusing lens 4...

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Abstract

The invention discloses a laser radar scanning galvanometer three-dimensional angle measuring device and method, and belongs to the field of angle measurement. The device comprises a laser, a collimating lens, a beam splitter prism, a scanning galvanometer, a focusing lens and a laser spot detector. The scanning galvanometer is a specially-made galvanometer with a special structure, the front surface of the scanning galvanometer is a coated reflector, and the rear surface of the scanning galvanometer is coated with a reflective diffraction grating. The collimated laser beam irradiates a reflective diffraction grating on the rear surface of the scanning galvanometer. The zero-order diffracted light beam and the positive-order diffracted light beam are reflected at different angles and transmitted through the light splitting prism and the focusing lens, and irradiating to the two laser spot detectors in parallel, and the displacements of the zero-order diffraction spots and the positive-order diffraction spots on the two laser spot detectors are calculated to obtain the deflection angles of the scanning galvanometer in three dimensions.

Description

technical field [0001] The invention relates to the field of angle measurement, in particular to a laser radar scanning vibrating mirror three-dimensional angle measurement device and method. Background technique [0002] Lidar is a laser sensing system that integrates functions such as target detection, long-range ranging, and area array imaging. It has relatively high distance and angle measurement resolution, relatively large measurement range and working distance, and excellent Anti-interference ability. In recent years, the application scenarios of lidar have gradually shifted from military use to civilian use, playing an increasingly important role in resource exploration, transportation and communication, and environmental detection. The laser radar system is mainly composed of a laser emitting system, a galvanometer scanning system, a laser receiving system and a signal processing system. The galvanometer scanning system is an important part of the laser radar syste...

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Application Information

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IPC IPC(8): G01B11/26G01S17/06
CPCG01B11/26G01S17/06
Inventor 黄腾超王先帆车双良舒晓武
Owner ZHEJIANG UNIV
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