Influence of Spatial Phase Aberration on Heterodyne Non-Imaging Array Detector

DONG Hongzhou1 LIU Yong1 YANG Chunping1 AO Mingwu1 WU Jian1

(1.School of Optoelectronic Information, University of Electronic Sciences and Technology of China, Chengdu, Sichuan, China 610054)

【Abstract】Taking the mismatch angle between signal and local oscillator beams as an example, we analyze the influence of spatial phase aberration on the heterodyne non-imaging array detector based on theoretical derivation and numerical calculation, and compare the array detector with the single detector with the same size. The research results reveal that the attached phase term of the signal output from detector element will severely affect the performance of the non-imaging array detector. Therefore, when only the spatial phase aberration is concerned, the array detector with a simple linear superposition cannot contribute to the performance improvement of the system. If the attached phase in the signal of detector element is eliminated by a certain method, the non-imaging array detector can greatly increase the signal-to-noise ratio of the heterodyne system even if the aberration is severe. Our results enrich the research of the non-imaging array detector in heterodyne detection and have guiding significance for the application of this technology.

【Keywords】 signal processing; heterodyne detection; array detector; mismatch angle; spatial phase aberration; signal-to-noise ratio;

【DOI】

【Funds】 National Natural Science Foundation of China (61308109)

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This Article

ISSN:0253-2239

CN: 31-1252/O4

Vol 37, No. 04, Pages 102-108

April 2017

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Article Outline

Abstract

  • 1 Introduction
  • 2 Relevant fundamental theory
  • 3 Noise current
  • 4 Spatial mismatch angle
  • 5 Signal-to-noise ratio
  • 6 Numerical calculation
  • 7 Conclusion
  • References