基于阵列探测器的空间失配角匹配外差探测研究  

Study on the Angle Mismatching Heterodyne Detection Technology Based on Array Detector

作　　者：董洪舟[1] 敖明武[1] 杨若夫[1] 吴健[1] 杨春平[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：《激光与光电子学进展》2012年第8期95-100,共6页Laser & Optoelectronics Progress

摘　　要：空间失配角是影响外差探测的主要因素之一,很小的角度失配就会导致中频信号极为微弱。通过分析提出,外差信号的振幅可以视为探测器量子效率分布函数的傅里叶变换,基于此提出一种单元增益可调的阵列探测器接收方法。该方法通过设置阵列中探测单元的增益系数,使阵列有效量子效率分布函数的频谱特性匹配信号光与本振光形成的干涉光场,以此提高存在失配角时的中频信号的强度。通过对有效量子效率分布函数的调整,匹配不同角度入射的信号光,即可达到高速扫描探测的目的。The angle between signal light and local light is an important factor affecting the heterodyne detection.Even a small angle will lead the intermediate frequency signal to be weak.It is pointed out that the amplitude of the intermediate frequency signal can be regarded as the Fourier transform of the distribution function of quantum efficiency of detector.Based on that,a method using array detector in which the gain of unit is adjustable is proposed.One can form an effective quantum efficiency function matching the spatial mismatch angle by adjusting the gain magnification coefficient,which can enhance the intermediate frequency signal intensity.According to the method,high-speed scanning detection can be realized by a programmable controller.

关 键 词：测量 外差探测 阵列探测器 失配角 傅里叶变换 

分 类 号：TN958[电子电信—信号与信息处理]