Three-dimensional imaging laser radar and method based on unit single-photon detector

Abstract

The invention discloses a three-dimensional imaging laser radar and method based on a unit single-photon detector, and relates to the field of three-dimensional imaging. The laser radar includes: a laser beam splitter; a main wave detector which records the emission time of the pulse laser according to the detected pulse laser; an optical emission system, wherein the optical emission system irradiates the other part of pulse laser onto a target object; an optical receiving system which receives pulse laser reflected by the target object and transmits the signals to an optical fiber array single-photon detector; the optical fiber array single-photon detector which detect the pulse laser reflected by the target object in a time-sharing manner to obtain the pixel coordinates of the target object and a receiving moment of pixel echoes; and a processor which determines a distance matrix according to the emission time, the pixel coordinates and the receiving time, so that non-scanning three-dimensional imaging can be performed on the target only by using the unit single-photon detectors, mutual interference between the adjacent unit single-photon detectors does not exist, and the three-dimensional imaging laser radar and method are easy to implement and low in cost.

Description

technical field [0001] The invention relates to the field of three-dimensional imaging, in particular to a three-dimensional imaging lidar and method based on unit single photon detectors. Background technique [0002] 3D imaging lidar realizes 3D imaging by acquiring distance information of the target. The basic principle is to calculate the distance by measuring the time it takes for a laser pulse to travel back and forth from the radar to the target. In order to obtain the distance of different target points, scanning or non-scanning mode can generally be used. Generally, the array single-photon detector of lidar is composed of multiple unit single-photon detectors. The disadvantage of this detector is that the response efficiency of each single-photon detector in the detector array is inconsistent, which affects the overall detection effect of the array. . Moreover, there is crosstalk between adjacent single-photon detectors, which affects the overall detection effect...

AI Technical Summary

Problems solved by technology

Generally, the array single-photon detector of lidar is composed of multiple unit single-photon detectors. The disadvantage of this detector is that the response efficiency of each single-photon detector in the detector array is inconsistent, which affects the overall detection effect of the array.

In addition, there is crosstalk between adjacent single photon detectors, which affects the overall detection effect of the array. The arrangement requirements are high, difficult to achieve, and the cost is high

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