Near-infrared laser ranging method based on linear sensitive photon detector

Abstract

The invention relates to a near-infrared laser ranging method based on a linear sensitive photon detector, and belongs to laser ranging and weak infrared light detecting types. A ranging system achieves the linear sensitive photon detection on the basis of the external gain based on the pulse laser flight time ranging method and through the combination of a PIN photodiode and an EDFA, echo light with different intensities can be detected, accordingly, the distance information is obtained, meanwhile, the materials of a detected target is judged according to the specific number of returned photons, and precise measurement of different distances and different targets is achieved. Compared with other sensitive photon detection, the horizontal return light linear detection from a single photon to multiple photons can be achieved by adjusting the gain multiple of the EDFA, the photon number can be detected in a distinguishable mode, the working range of the laser ranging is greatly enlarged, the near-infrared laser ranging method meets the requirements for near, medium and remote laser ranging at the same time, and the fast distinguishing of the detected target material is achieved.

Description

technical field [0001] The invention relates to a ranging technology, in particular to a near-infrared laser ranging method based on a linear sensitive photon detector. Background technique [0002] Laser ranging inherits the characteristics of good monochromaticity and strong directionality of laser, and has broad application prospects in many national defense and civilian fields such as communication, remote sensing, aerospace and military reconnaissance. Laser ranging methods can be divided into three categories: interferometry, time-of-flight, and triangulation, which meet the application requirements of different measurement accuracy and range. Among them, the time-of-flight method, judging the distance of the target object according to the flight time of the laser, is the most direct way in space ranging. The specific working method is as follows: the laser pulse is transmitted to the measured target through the laser emission system, and the measured The diffusely re...

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problem that the currently used photon detectors cannot satisfy different ranging ranges and the working efficiency of distinguishing target objects is low, and proposes a near-infrared laser ranging method based on a linear sensitive photon detector. In the ranging method The photon detector used is based on the external gain. The photon is amplified and then detected by a linear photodiode. By adjusting the external gain, the sensitivity of the photon detector can be adjusted to meet the needs of different ranging ranges.

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