基于APD的电外差技术在无合作目标激光测距中的应用  

Avalanche Photodiode Used as Optoelectronic Mixer in Phase-Shift Laser Range Finder with Non-Cooperative Target

作　　者：赵欣[1] 王相金[1] 张毅[1] 赵平建[1] 涂碧海[1] 姚萍萍[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室,安徽合肥230031

出　　处：《大气与环境光学学报》2010年第4期311-315,共5页Journal of Atmospheric and Environmental Optics

摘　　要：在无合作目标相位式激光测距中,为了提高测程和改善信噪比,提出一种基于雪崩光电二极管的电外差测量技术。在该方法中,雪崩光电二极管通过电注入法可直接被作为混频器,它接收到的回波光信号在转换成电流信号时直接和一本振信号混频产生低频信号。实验结果表明,该方法可有效改善雪崩光电二极管输出信号的信噪比,提高无合作目标相位式激光测距的测程。A heterodyne photo detection method is proposed in order to improve the signal to noise ratio of a frequency-modulated-continuous-wave （FMCW） laser range finder. For this purpose, the non-linearity of the current-voltage characteristic of an avalanche photodiode （APD） is used. The photoelectric current is mixed with a local oscillator （LO） signal inside the APD working as an optoelectronic mixer. The signal from the LO can be injected inside the APD by an electrical channel. Experimental results are in agreement with the theoretical analysis, and this method shows that it can greatly improve the measurement distance in phase-shift laser range finder with non-cooperative target.

关 键 词：激光测距 相位式 电外差混频 雪崩光电二级管 

分 类 号：TN247[电子电信—物理电子学]