Three-dimensional imaging all-solid-state laser radar device

Abstract

The invention discloses an all-solid-state laser radar device for three-dimensional imaging. The invention relates to the technical field of laser radars, and solves the problem that an existing laser radar system is relatively weak in integrated miniaturization and external anti-interference capability. The device comprises a tunable semiconductor laser array, a transmitting chip, a light path lens system, a laser receiving chip and a digital processing system. The transmitting chip and the laser receiving chip are both optical phased arrays. The tunable semiconductor laser array is capable of emitting an array of laser beams. The emission chip can convert a laser beam array emitted by the tunable semiconductor laser array into scanning beams with phase differences. The laser echo signal obtained by reflection of the target object can be received by the laser receiving chip after being transmitted by the optical path lens system. The laser receiving chip can process the laser echo signal to obtain an analog signal and send the analog signal to the digital processing system. According to the invention, integration and miniaturization are realized, and a high-precision and high-anti-interference three-dimensional imaging function is realized.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to an all-solid-state laser radar device for three-dimensional imaging. Background technique [0002] Lidar is one of the main sensors for autonomous driving and robot applications. It is as important to driverless cars as the sonar system is to whales and the eyes are to humans. Therefore, it is called the eyes of smart cars. Lidar mainly measures the position, speed and other characteristics of the target by emitting laser beam scanning to the target object and receiving the echo signal reflected from the target object. At the same time, the cloud computing system processes the information to form a 3D environment with centimeter-level accuracy. map. Because the laser wavelength of the laser radar system is generally only on the order of microns, it can detect very small targets, with strong directionality, fast response, and much higher measurement accuracy than millimeter-w...

AI Technical Summary

Problems solved by technology

The traditional two-dimensional mechanical rotary lidar is heavy, expensive, and mechanically worn. Its internal structure includes optical devices, electronic components and laser devices, etc., which are numerous and scattered, and the process is difficult, especially the debugging process of precision components. It is difficult to achieve mass production and promotion; for solid-state lidar, the size is small, the measurement accuracy is relatively high, and it can be hidden in the car body without damaging the appearance. The all-solid-state optical phased array lidar realized by the principle of OPA has no macroscopic and microscopic moving parts inside, so there is no mechanical wear and high reliability. It is recognized as an ideal choice for low-cost, miniaturized lidar

[0004] At present, the OPA-style all-solid-state lidar has a large-scale optical phased array at the transmitter and receiver, and the transmitter is used to complete two-dimensional beam scanning. This process requires laser wavelength tuning and phase shifter control respectively. It is difficult to control in one dimension. In addition, the phase shifter at the transmitting end needs to be driven by a control circuit, and its power consumption and area increase sharply with the increase of the number of these components; the receiving end is used to receive and process the laser reflected from the target. The echo signal, when encountering extreme weather, the light energy is affected by the refractive index, which will cause the distortion of the light signal at the receiving end, resulting in the wrong recognition of the laser radar

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