Multi-laser radar detection system based on single laser light source

Abstract

The invention discloses a multi-laser radar detection system based on a single laser light source. The multi-laser radar detection system comprises a laser light source, an adjustable light beam splitter, an external light source laser radar and a controller, a light source emitted by the laser light source is coupled to the adjustable light beam splitter or the waveguide coupler through optical fibers and then connected to the multiple external light source laser radars through optical fibers, the external light source laser radars are provided with photoelectric detectors, detected reflected light signals are converted into electric signals, and the electric signals are fed back to the controller through electric signal transmission lines. The controller obtains a detection result according to a pulse signal of the laser light source and a feedback electric signal of the external light source laser radar. According to the invention, the output optical power of each laser can be dynamically adjusted, so that the detection distance and the detection sensitivity of each laser radar can be adjusted. The photoelectric detection module is integrated on the laser radar externally connected with the laser light source, so that coupling loss is avoided. The laser radar with an external laser light source and signal processing can reduce the cost of a single laser radar.

Description

technical field [0001] The invention belongs to the field of laser radar, and relates to a laser radar based on a single laser light source, an adjustable optical beam splitter, and multiple external light sources to realize multi-laser radar detection. Background technique [0002] The multi-lidar detection system is a combination of multiple independent laser radars, which can detect and perceive the surrounding environment more comprehensively, avoiding the blind spot of a single laser radar. The multi-lidar detection system has a wide range of applications in unmanned vehicles, surveying and mapping, monitoring and other fields. [0003] At present, one solution to realize a multi-lidar system is to use multiple independent single-line lidars or independent multi-line lidars to form a multi-lidar detection system. Such systems are expensive and expensive to maintain. Especially when a lidar fails, the entire lidar needs to be replaced. Moreover, it is impossible to dy...

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Problems solved by technology

Moreover, it is impossible to dynamically adjust the detection distance or detection sensitivity by adjusting the output power of each laser radar.

Another solution is to use a single light source and detector to realize a multi-lidar system, but in this system, there is a lack of a power-adjustable beam splitter, and it is impossible to dynamically adjust the output optical power of each laser radar. In the system, the light is coupled from the space to the optical fiber, and then passed to the photodetector, which increases the coupling loss of the space light to the optical fiber

Moreover, the optical signals of different laser radars are converted into optical signals by using a unique photodetector, which is also prone to crosstalk between signals, which limits the practical application of this scheme.

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