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What is the solid-state lidar technology route?
Release time:
2021-05-12
Three technical routes formed by solid-state LiDAR
After so many years of development, the basic framework of solid-state LiDAR has become relatively clear. The following are the three mainstream solutions currently available:
MEMS (Micro Electro Mechanical Systems) Micro Electro Mechanical Systems
MEMS (Micro Electro Mechanical Systems) is the abbreviation for MEMS and is the name used in the United States. It refers to the miniaturization and electronic design of mechanical mechanisms. Previously bulky mechanical structures could be integrated onto silicon-based chips through microelectronics technology, allowing for large-scale production. One dimensional vertical scanning can be achieved through MEMS micromirrors. The other light sources are fiber lasers, mainly due to the low repetition rate and high average repetition rate of 905nm tubes.
Strictly speaking, MEMS cannot be considered a pure solid-state LiDAR because in MEMS solutions, mechanical technology has not been completely eliminated, only miniaturization has been achieved.
2. OPA (Optical Phased Array) Optical Phased Array Technology
Optical phased array technology can achieve reconstruction or precise control of the equal phase plane of the array beam by controlling the phase of the unit beam in the beam array. After control, the main beam can scan in different directions. The accuracy of radar can reach millimeter level, but the only difficulty lies in how to improve the point cloud data measured per unit time and the huge investment cost.
3. Flash
The imaging principle of flash LiDAR is to emit a large area of laser to illuminate the entire scene at once, and then use multiple sensors to receive the reflected light detected. But the biggest problem is that this working mode requires very high laser power. Under the limitation of volume, the power density of flash lidar cannot be very high. So the current problem with flash LiDAR is that due to the limitation of power density, it cannot balance the three parameters of field of view, detection distance, and resolution. That is, if the detection distance is too far, the field of view or resolution must be sacrificed; If high resolution is required, the viewing angle or detection distance must be sacrificed.
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