a scanning device

Abstract

The invention provides a scanning device, which comprises a scanning module and an angle measuring module. The scanning module and the angle measuring module are spaced apart by a first preset distance. The scanning module comprises a scanning substrate comprising a movable portion. The movable portion has a first surface for reflecting an angle measuring beam. The angle measuring module comprisesa light source and a receiving assembly. The light source and the receiving assembly are spaced apart by a second preset distance. The light source emits the angle measuring beam toward the first surface. The receiving side of the receiving assembly faces the first surface. The first surface reflects the angle measuring beam emitted by the light source to the receiving assembly. The scanning device measures the rotation angle of the movable portion of the scanning module by the angle measuring module, and specifically adopts a psd position sensor to obtain spatial coordinates of the movable portion by measuring the displacement, thereby improving the position resolution and the measurement response speed.

Description

technical field [0001] The invention relates to the technical field of laser detection, in particular to a scanning device. Background technique [0002] In the autonomous driving technology, the environmental perception system is a basic and crucial part, and it is the guarantee of the safety and intelligence of the autonomous driving vehicle. The lidar in the environmental perception sensor has great advantages in terms of reliability, detection range, and ranging accuracy. Incomparable advantages. The laser radar transmits and receives the laser beam, analyzes the turn-back time after the laser encounters the target object, and calculates the relative distance between the target object and the vehicle. [0003] The mechanical rotating lidar is driven by a motor to drive the mirror or the overall optical-mechanical structure to rotate, which can obtain a larger field of view, especially the overall rotating lidar, which can directly realize 360° horizontal measurement wit...

AI Technical Summary

Problems solved by technology

In the prior art, the angle-measuring coil is usually used to measure the rotation or swing angle of the vibrating mirror. The angle-measuring coil measurement is an indirect measurement method. First, the speed of the vibrating mirror is measured, and then the vibrating mirror can be obtained through further analytical calculation The spatial coordinates of the actual use will increase the amount of calculation of the system

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