What Is The Principle Of Laser Triangulation?

As a low-cost lidar design scheme, laser triangulation ranging method can obtain high-precision, cost-effective application effects and become the preferred solution for indoor service robot navigation. This article will introduce the core components of lidar and focus on laser triangulation-based The principle of laser radar for ranging method.

The laser triangulation method mainly illuminates the measured target with a beam of laser at a certain angle of incidence. The laser reflects and scatters on the surface of the target. At another angle, the lens is used to focus and image the reflected laser. The spot image is at the Charge-coupled Device position. On the sensor. When the measured object moves along the laser direction, the light spot on the position sensor will move, and the displacement size corresponds to the moving distance of the measured object. Therefore, the distance between the measured object and the baseline can be calculated by the algorithm design and the spot displacement distance value. Because the incident light and the reflected light form a triangle, the geometric triangle theorem is used to calculate the spot displacement, so this measurement method is called the laser triangle distance measurement method.