Return-to-zero judgment device and method used in galvanometer scanning rotation process

Abstract

The invention discloses a return-to-zero judgment device and method used in a galvanometer scanning rotation process, and belongs to the technical field of environmental monitoring. The return-to-zero judgment device comprises a slewing bearing, a mounting support plate is fixed on an inner ring of the slewing bearing, a driving device, an infrared sensor and a laser sensor are mounted on the mounting support plate, the driving device is connected with an outer ring of the slewing bearing, a stand column A is installed on the outer ring, and a small hole B is formed in the outer ring in the axial direction. According to the invention, multiple sensors are combined and applied to zero-returning positioning of the scanning galvanometer, the outer ring is firstly controlled to rapidly rotate around the inner ring, the infrared sensing technology is utilized to realize large-size positioning and reduce the zero-returning range, then rotation stepping is carried out at a low speed, and the laser detection technology is utilized to realize small-range final rapid zero-returning control.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a device and method for judging zero return during scanning and turning of a vibrating mirror. Background technique [0002] In the field of environmental monitoring, the scanning galvanometer is an important part of lidar atmospheric monitoring. The scanning accuracy directly affects the distribution of atmospheric pollutants and the traceability results, and the accuracy of the zero position judgment directly determines the cumulative accuracy of the galvanometer scanning. [0003] Existing scanning galvanometers mostly use a single infrared photoelectric sensor, which uses the principle of object reflection of infrared beams for detection. Second, the internal photocoupler is susceptible to interference from various heat sources, vibrations or radiation, which cannot meet the requirements of high precision and high reliability; Third, most scanning galvanomete...

AI Technical Summary

Problems solved by technology

[0003] Existing scanning galvanometers mostly use a single infrared photoelectric sensor, which uses the principle of object reflection of infrared beams for detection. Second, the internal photocoupler is susceptible to interference from various heat sources, vibrations or radiation, which cannot meet the requirements of high precision and high reliability; Third, most scanning galvanometers are placed outdoors and need to withstand high and low temperatures , vehicle vibration and other conditions, the working environment is relatively harsh, and the infrared sensor needs to be repaired, adjusted or replaced frequently to ensure the zero position accuracy of the galvanometer

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