Angular measurement device for scanning device of laser radar, angular measurement method

By setting conductors and resonant systems on the scanning mirror, and combining them with reference and edge angle measurement circuits, the problems of insufficient signal-to-noise ratio and thermal deformation error in the existing scanning mirror angle measurement are solved, and high-precision angle measurement is achieved.

CN115236640BActive Publication Date: 2026-07-07HESAI TECH CO LTD
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Patent Information

Application Number
CN202110442203.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-04-23
Publication Date
2026-07-07
Estimated Expiration
2041-04-23

AI Technical Summary

Technical Problem

Existing scanning mirror angle measurement methods cannot improve the signal-to-noise ratio while reducing device size, and cannot eliminate measurement errors caused by factors such as thermal deformation.

Method used

The method involves placing a conductor on the scanning mirror and combining it with a resonant system and a sampling unit. The deflection angle of the scanning mirror is determined by measuring the parameters of the resonant system, including a reference angle measurement circuit and an edge angle measurement circuit, thus eliminating the influence of factors such as thermal deformation.

Benefits of technology

It improves the accuracy and reliability of scanning mirror angle measurement without increasing power supply and heat dissipation requirements, reduces measurement costs, and eliminates measurement deviations caused by factors such as thermal deformation.

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Abstract

The application discloses an angle measuring device, method and laser radar of a scanning device. The device comprises a conductor, an angle measuring circuit; wherein the scanning device comprises a scanning mirror, one side of the scanning mirror is a reflecting surface, the other side is a mounting surface, and the scanning mirror can be deflected around at least one axis; the conductor is fixed on the mounting surface; the angle measuring circuit comprises a resonance system and a sampling part, the resonance system comprises an inductive element and a capacitor, the inductive element is fixedly arranged at a preset distance from the static position of the conductor; the sampling part samples and outputs the electric signal of the resonance system, and is used for determining the parameters of the resonance system, so as to determine the deflection angle of the scanning mirror. The purpose of measuring the deflection angle of the scanning mirror is achieved.
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