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信号光与本地光的夹角是影响探测器输出外差信号强度的主要因素。当夹角过大时,甚至不能检测到外差信号。通过分析提出,外差信号的振幅实际上是接收孔径透射率函数的傅里叶变换,以此为依据提出一种降低失配角对外差信号影响的方法,即在接收孔径处放置透射率分布满足一定函数形式的透过型元件,使其傅里叶频谱满足预定的要求,这种情况下两光束夹角增大时,探测器输出的外差信号强度能得到增强,从而降低了对探测系统瞄准精度的要求。
The angle between the signal light and the local light is the main factor that affects the detector output heterodyne signal strength. When the angle is too large, even heterodyne signals can not be detected. It is proposed by analyzing that the amplitude of the heterodyne signal is actually a Fourier transform of the receiving aperture transmissivity function. Based on this, a method of reducing the influence of the mismatch angle on the heterodyne signal is proposed, that is, the placement of the transmittance distribution at the receiving aperture satisfies A certain function of the transmission element to make its Fourier spectrum to meet the predetermined requirements, in which case the angle between the two beams increases, the detector output heterodyne signal strength can be enhanced, thus reducing the detection system Aiming accuracy requirements.