Chen Junbao, Wang Ming, Xia Wei, Hao Hui, Guo Dongmei, Lin Hao
Department of Information Technology, Nanjing Forest Police College, Nanjing 210023, People's Republic of China.
School of Physics and Technology, Nanjing Normal University, Nanjing 210023, People's Republic of China.
Rev Sci Instrum. 2020 Sep 1;91(9):095002. doi: 10.1063/5.0014812.
In this work, a novel fringe double scheme with a Fabry-Pérot (F-P) cavity is proposed for self-mixing interferometry based on the narrow transmission spectrum mapping. While the laser beam with self-mixing interference (SMI) propagates through the F-P cavity with the narrow transmission spectrum, the SMI fringe doubles as the optical frequency modulation caused by SMI sweeps the peak of the transmission spectrum of the F-P cavity completely. The doubled SMI signal is very suitable for displacement reconstruction with fringe counting and velocity monitoring with joint time-frequency analysis, since it inherits the merits of the transmission spectrum of the F-P cavity (sharp, neat, and stable). This method has the potential to simplify signal processing and improve the resolution of SMI measurement systems.
在这项工作中，基于窄透射光谱映射，提出了一种带有法布里-珀罗（F-P）腔的新型条纹倍增方案用于自混合干涉测量。当具有自混合干涉（SMI）的激光束通过具有窄透射光谱的F-P腔传播时，由于SMI引起的光频率调制完全扫过F-P腔透射光谱的峰值，SMI条纹会加倍。加倍后的SMI信号非常适合通过条纹计数进行位移重建以及通过联合时频分析进行速度监测，因为它继承了F-P腔透射光谱的优点（尖锐、整齐且稳定）。该方法具有简化信号处理并提高SMI测量系统分辨率的潜力。
