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Definition and classification of lidar


LiDAR is a general term for active sensors that detect environmental information through laser ranging technology. It uses a laser beam to detect targets, obtain data and generate accurate digital engineering models.

At present, there are three types of laser ranging technology for laser radar:
1. The Laser Time of Flight (TOF) method can obtain the distance by multiplying the flight time of the light pulse between the target and the radar by the speed of light divided by two. The maturity of the scheme is relatively high, which is suitable for long-distance detection. The car laser radar uses this solution.

2. Triangulation method, because the incident light and the reflected light form a triangle, the geometric triangle theorem is applied to the calculation of the spot displacement. Therefore, the measurement method is called laser triangulation method, suitable for short-distance measurement, and is mostly used for single-line two-dimensional laser radar. .

3. Frequency-modulated continuous wave method (FMCW), the principle is similar to Radar. By measuring the fluctuation of light such as Doppler effect, the difference between the emission spectrum frequency and the receiving spectrum frequency can be calculated, and the distance and speed can be obtained.

There are no mature products yet. There are many types of laser radars, which can be classified into laser ranging radar, laser speed radar, laser imaging radar, atmospheric detection radar, and tracking radar according to functional purposes.

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