Light field matching heterodyne detection device and method based on array detector

Abstract

The invention discloses a light field matching heterodyne detection device and method based on an array detector, and belongs to the field of laser heterodyne detection, especially continuous heterodyne detection capable of utilizing the array detector for carrying out light field matching correction on signal light and local oscillator light. The signal-to-noise ratio of heterodyne detection can be improved. A light signal is received through the array detector, weighted stacking is carried out on receiving signals of all units of the array detector, and finally a total intermediate frequency signal obtained after stacking is output. In the target detection process, firstly, the signal light reflected back by a target is independently received, then the local oscillator light is independently received, weighting coefficients of all the detection units in the array detector are calculated according to detected light field distribution of the signal light and the local oscillator light, then the signal light and the local oscillator light are received at the same time, weighted stacking is carried out on detection signals output by the detection units according to the calculated weighing coefficients, and finally a composite signal obtained after stacking is output. Therefore, the effect of improving the signal-to-noise ratio of heterodyne detection and the effect of easy and convenient operation are achieved.

Description

technical field [0001] The invention belongs to the field of laser heterodyne detection, in particular, the array detector can be used to perform continuous heterodyne detection of light field matching correction between signal light and local oscillator light, and the signal-to-noise ratio of heterodyne detection can be improved. Background technique [0002] Laser heterodyne detection has many advantages, but the performance of this technique is limited by various factors. Factors such as atmospheric turbulence, receiving system aberration, and the angle between the signal light and the local oscillator light will cause the signal-to-noise ratio of heterodyne detection to decrease. These factors can be described as the mismatch between the signal light and the local oscillator light field. [0003] In a research document published in 2012 (Dong Hongzhou, Ao Mingwu, Yang Ruofu, etc. Research on space mismatch angle matching heterodyne detection based on array detectors [J] ...

AI Technical Summary

Problems solved by technology

However, this detection system has relatively large defects. It can only perform heterodyne detection on the spatial mismatch angle, and because the effective quantum efficiency function is constantly changing for scanning detection, the detection time is too long

Moreover, when there are factors such as optical system aberration and atmospheric turbulence in the detection, this detection system does not have the effect of enhancing the signal-to-noise ratio

Images