Laser radar

Abstract

The invention provides a laser radar. The laser radar comprises a rotor, a laser emitting system and a receiving system; the rotor is provided with an emitting cabin and a receiving cabin which are separated from each other; the laser emitting system is arranged in the emitting cabin; the receiving system is arranged in the receiving cabin; the laser emitting system comprises an emitting circuit group, a first number of outgoing optical fibers, and an optical fiber fixing device; the emitting circuit group includes a second number of laser light sources; laser beams emitted by the laser lightsources are coupled to the outgoing optical fibers; the optical fiber fixing device comprises an optical fiber fixing plate; the optical fiber fixing plate has a first side surface and a second side surface; optical fiber fixing grooves are formed in the first side surface and / or the second side surface; and the optical fiber fixing grooves are used for fixing the outgoing optical fibers. According to the laser radar of the invention, an arbitrary number of optical fibers can be fixed by means of the combination of the optical fiber fixing device and the optical fiber coupling technology, so that the high wiring harness of the laser radar can be realized; the arrangement of the laser is more flexible; and the heat dissipation parts of a heat sink component and a top cover can be used in amatched manner, so that the heat dissipation problem of the laser radar can be solved.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a laser radar. Background technique [0002] As an important part of the intelligent vehicle environment perception hardware system, Lidar (LIDAR) undertakes important tasks such as roadside detection, obstacle recognition, and real-time localization and mapping (SLAM) in automatic driving. The LIDAR system consists of a laser emitting system and a receiving system. The laser transmitter system generates and emits light pulses, hits the object and reflects back, and is finally received by the receiver. The receiver accurately measures the travel time of the light pulse from when it is emitted to when it is reflected back. Because light pulses travel at the speed of light, the receiver will always receive the previous reflected pulse before the next one is sent. Given that the speed of light is known, travel time can be converted into a measure of distance. LiDAR can accur...

AI Technical Summary

Problems solved by technology

Conventionally used semiconductor laser pulse diodes have a very small light-emitting area, but in fact, due to the influence of the chip package and the size of the driving circuit, the distance between the lasers cannot become very dense.

Considering this practical limitation, in order to achieve a higher number of lines and a higher angular resolution, it is forced to increase the density of angles and the number of lines by adding more columns of lasers in the horizontal direction, which will lead to The more columns, the more difficult the production and adjustment, the more complex the process, and the lower the production efficiency; the space utilization rate in the system is low, the focal plane position is particularly crowded, the heat generation is large, and the heat is difficult to be exported, etc. A series of problems

[0004] On the other hand, the existing vehicle-mounted lidar devices are heavy, and the launching cabin and receiving cabin mostly adopt symmetrical structures. The symmetrically distributed cabins will lead to unreasonable space allocation between the launching cabin and the receiving cabin, which is not conducive to the miniaturization of the lidar

Moreover, the detectors of the receiving system do not fully consider the protection measures, and are easily affected by foreign objects such as stray light and dust, thereby shortening the service life of the detectors

In addition, the weight of each device in the receiving cabin is relatively heavy, which increases the weight and volume of the system, making it difficult to achieve low cost and miniaturization of equipment

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