基于光梳多波长干涉实时绝对测距的同步相位解调

Synchronous Phase Demodulation for Real-Time Absolute Distance Measurement Based on Optical Comb Multi-Wavelength Interferometry

光梳的出现带来了大尺寸高精度绝对测距(ADM)技术的革新,其卓越的光频特性推动了基于多波长干涉的实时ADM的发展。为在基于光梳多波长干涉的实时ADM中实现干涉信号的同步相位解调,提出了基于多波长外差干涉的多路同步相位解调信号处理方法,研制了相应的同步相位解调模块。实验中通过对波长进行解复用,测试了多路相位计的线性精度、稳定度和同步性等性能,对多波长干涉信号的实时同步相位解调进行了实验分析,验证了该方法实现高精度同步相位解调的可行性。

The advent of optical comb has brought technical innovation for large-scale and high-precision absolute distance measurement（ADM）.The marvelous features of optical frequency facilitate the great development to the real time ADM based on multi-wavelength interferometry. To realize synchronous phase demodulation for interference signals in real-time ADM based on optical comb multi-wavelength interferometry,we propose a multichannel synchronous phase demodulation signal-processing method based on multi-wavelength heterodyne interferometry,and develope a related phase demodulation module.The wavelength de-multiplexing is conducted in the experiment. Performances of the multi-channel phasemeter, such as linear precision, stability and synchronization,are tested.The experimental analysis about the real-time synchronous phase demodulation for multi-wavelength interference signal is carried out,and the feasibility of realizing high-precision synchronous phase demodulation with the proposed method is verified.