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。 Spatial mismatch angle is one of the main factors that affect the detection of heterodyne. A small angle mismatch will result in very weak IF signal. The analysis shows that the amplitude of the heterodyne signal can be regarded as the Fourier transform of the detector’s quantum efficiency distribution function. Based on this, an array detector receiving method with adjustable unit gain is proposed. By setting the gain coefficient of the detection unit in the array, the spectral characteristic of the effective quantum efficiency distribution function of the array is matched with the interference light field formed by the signal light and the local light to improve the intensity of the IF signal in the presence of mismatch angle. By adjusting the effective quantum efficiency distribution function and matching the signal light incident at different angles, the purpose of high-speed scanning detection can be achieved.