Laser radar device and laser radar system

Abstract

The invention relates to the technical field of laser, and discloses a laser radar device. The laser radar device comprises a signal transmitting module, a signal receiving module, an optical path adjusting module and a data processing module, wherein the signal transmitting module is used for transmitting a laser signal to a target object; the signal receiving module is integrated with the signaltransmitting module on the same laser radar main board, and is used for receiving the laser signal reflected by the target object; the optical path adjusting module is arranged on an optical path inwhich the laser signal locates, and is used for adjusting the optical path of laser; and the data processing module is connected with the signal receiving module, and is used for analyzing and processing the laser signal reflected by the target object. The signal transmitting module is a vertical cavity surface emitting laser (VCSEL) array. The signal transmitting module and the signal receiving module are integrated on the same laser radar main board, thereby greatly simplifying the structure of the laser radar device, reducing the size of the existing laser radar device, improving the integration degree, and conforming to the trend of miniaturization of the current laser radar.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a laser radar device and a laser radar system based on a vertical cavity surface emitting laser. Background technique [0002] Lidar (LiDAR) is growing rapidly in the field of automotive autonomous driving, mainly by using a 905nm semiconductor laser in the near-infrared band to emit laser pulses, and then using a silicon-based avalanche photodetector (APD) to collect reflected light signals to create a sense of the surrounding environment of the car. Point cloud map to realize autonomous navigation and assisted driving. [0003] The famous Velodyne company in the United States has mechanical fast-scanning lidars with three specifications of 16, 32, and 64 lines. Among them, the highest specification 64-line lidar has a measurement range of 120m and a measurement accuracy of about 20mm, but its price is even as high as 75,000 U.S. dollars, which are very expensive and bulky, cann...

AI Technical Summary

Problems solved by technology

However, 905nm lasers are not an eye-safe LiDAR light source, and edge-emitting lasers have poor beam quality

In addition, the high integration of semiconductor lasers, near-infrared detectors, microlenses, control circuits, and analysis software in all-solid-state lidar is the mainstream direction of lidar. However, in the current all-solid-state lidar, lasers and detectors are independently packaged into modules. , it is impossible to achieve monolithic integration, and it is difficult to achieve high integration

Furthermore, most of the laser beams emitted by the current lidar are divergent, and the proportion of the laser beam actually projected on the target is very small, and the proportion of the laser beam returned to the detector is even smaller, the laser utilization rate is low, and the power consumption is low. Larger, and the sensitivity of the lidar is greatly reduced

Images