Optical receiving module, and laser radar system

Abstract

The present invention provides an optical receiving module and a laser radar system, the optical receiving module includes: an optical transmission sub-module and a detection sub-module sequentially arranged along the receiving optical path; the optical transmission sub-module is suitable for receiving, filtering, and transmitting light beams, the light beams include signal light; and the detection sub-module is adapted to receive and detect the light beams transmitted by the light transmission sub-module; wherein, the light transmission sub-module and / or the detection sub-module includes absorption type substrate, the absorption type substrate is suitable for absorbing at least light in a predetermined wavelength band outside the wavelength range of the signal light. The laser radar system includes: a light emitting module, adapted to emit a detection laser beam to the outside; and the light receiving module, adapted to receive and detect an echo signal of a laser beam formed by reflecting the detection laser beam from the outside. The light receiving module and the laser radar system of the embodiments of the present invention can suppress ambient light, increase the intensity of obliquely incident signal light at a large angle, and improve the signal-to-noise ratio.

Description

technical field [0001] The invention relates to the technical field of laser detection, in particular to a light receiving module and a laser radar system. Background technique [0002] Lidar is an advanced detection method that combines laser technology with photoelectric detection technology. Lidar is widely used in autonomous driving, transportation and communication, drones, intelligent robots, energy Security testing, resource exploration and other fields. [0003] The data quality of lidar is an important criterion to measure its performance. The data of the laser radar will be affected by the ambient light. In order to suppress the ambient light, the existing laser radar system usually uses a transmissive narrow-band interference filter. However, this solution will bring some problems, such as the transmissive interference filter The transmittance is greatly affected by the incident angle, and the transmittance of the signal light incident at a large angle will be ...

AI Technical Summary

Problems solved by technology

The data of the laser radar will be affected by the ambient light. In order to suppress the ambient light, the existing laser radar system usually uses a transmissive narrow-band interference filter. However, this solution will bring some problems, such as the transmissive interference filter The transmittance is greatly affected by the incident angle, and the transmittance of the signal light incident at a large angle will be very low, so that the laser radar cannot receive the signal incident at a large angle, unless the transmittance bandwidth of the transmissive interference filter is relaxed , but this again increases the effect of ambient light

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