An optical field matching heterodyne detection device and method based on an array detector

Abstract

The invention discloses a light field matching heterodyne detection device and method based on an array detector, which belongs to the field of laser heterodyne detection, and in particular can use an array detector to perform light field matching correction of signal light and local oscillator light. Differential detection can improve the signal-to-noise ratio of heterodyne detection. The optical signal is received by the array detector, and then the received signals of each unit of the array detector are weighted and superimposed, and finally the superimposed total intermediate frequency signal is output. In the target detection process, the signal light reflected by the target is firstly received separately, and then the local oscillator light is received separately, and the weight of each detection unit in the array detector is calculated according to the detected signal light and the light field distribution of the local oscillator light coefficient, and then receive signal light and local oscillator light at the same time, the detection signals output by each detection unit are weighted and superimposed according to the calculated weighting coefficients, and finally output the superimposed combined signal. Therefore, the heterodyne detection signal-to-noise ratio is improved and the operation is simple and convenient.

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

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