What determines the number of lines of lidar?

The basic components of lidar are transmitter and receiver. In fact, in the single-wire era, there are transmitters and receivers. In the multi-line era, there are many methods, such as adding a receiver array, swinging or moving the transmitter. At present, it is mainly received by receivers at different levels of the array by swinging, which is now the mainstream. There are also many emitters, but generally there are not many on-line. Another technique is to turn a light source into multiple light sources through a prism.

Single-wire radar has only one laser transmitter and receiver. After the motor rotates, the obstacle projected to the front is a line. This has the advantages of less data processing, high efficiency, good stability and mature technology, but it can only detect obstacles at the same height and cannot measure the overall contour. Multi-line radar is widely used in sweeping robots and hotel service robots. At present, there are 4 lines, 8 lines, 16 lines, 32 lines, 64 lines and 128 lines on the market, that is, there are multiple transmitters and receivers in the vertical direction, and multiple wire harnesses are obtained through the rotation of the motor. The more lines, the more perfect the surface contour of the object, and of course, the greater the amount of data processed, the higher the requirements for hardware; Multi-line radar is mainly used for unmanned driving, which can sense the information of the surrounding environment and demonstrate it in real time with 3D effect.

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