非成像外差阵列探测器受空间相位畸变的影响分析  

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

作　　者：董洪舟[1] 刘永[1] 杨春平[1] 敖明武[1] 吴健[1] 

机构地区：[1]电子科技大学光电信息学院,四川成都610054

出　　处：《光学学报》2017年第4期94-100,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61308109)

摘　　要：以失配角为例,与相同尺寸的单点探测器比较,理论结合数值计算分析了空间相位畸变对非成像阵列探测器的影响。结果表明,阵列中各单元信号的附加相位将严重影响这种探测方式的性能。因此,就空间相位畸变而言,简单的线性叠加方式不足以克服其影响。根据分析结果指出,若能通过一定方法消除阵列中各单元输出信号的附加相位,即使在空间畸变很严重的情况下,非成像阵列探测器仍然可以大幅提高系统的信噪比。丰富了非成像阵列探测器在外差探测领域的研究,对其应用具有一定的指导意义。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 increase greatly 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.

关 键 词：信号处理 外差探测 阵列探测器 失配角 空间相位畸变 信噪比 

分 类 号：TN958[电子电信—信号与信息处理]