基于环形腔光纤激光器的相位调制型A混合干涉仪  

Phase Modulated Self-Mixing Interferometer of a Ring Fiber Laser System

作　　者：郝辉[1] 夏巍[1] 李春成[1] 王鸣[1] 郭冬梅[1] 

机构地区：[1]南京师范大学物理科学与技术学院江苏省光电技术重点实验室,江苏南京210023

出　　处：《光学学报》2013年第B12期86-90,共5页Acta Optica Sinica

基　　金：国家自然科学基金（91123015）、江苏省高校自然科学研究面上项目（11KJB510006）

摘　　要：激光自混合干涉技术是近年来兴起的一种具有很高应用价值的干涉测量技术。为提高自混合干涉的位移测量精度，在环形腔光纤激光器自混合干涉系统中引入正弦相位调制技术。分析了干涉信号的相位调制和基于傅里叶变换的解调算法，讨论了相位调制器的调制噪声和多重反馈等因素对自混合干涉测量精度的影响。使用环形腔掺铒光纤激光器和光纤相位调制器构建了实验系统，对高精度商用微位移平台的振动进行了测量，在频域中获取了自混合干涉信号的相位，并重构了位移平台的位移，获得了λ/20的位移测量精度。实验结果表明，该系统提供了一种可靠的基于全光纤传感应用的高精度位移测量方法。In recent decades, the laser self-mixing interferometric technique has shown great promise in many applications. In order to improve the accuracy of the displacement measurement, sinusoidal phase modulating technique is introduced into a fiber ring laser self-mixing interferometer. Phase modulated interference is theoretically analyzed, and the phase demodulation algorithm of the interference signal is implemented by Fourier analysis. Error sources induced by the distortion of the interference signal in the presence of optical feedback and the phase modulator noise are evaluated in detail. The measurement setup is built by using an erbium-doped fiber laser and a phase modulator. The system is experimentally applied to reconstruct the motion of a high-precision commercial piezo actuator by acquiring the phase of self-mixing interference signal in the frequency domain, and a displacement measurement accuracy of λ/20 is obtained, providing a practically feasible solution for displacement measurement based on all optical-fiber sensing applications with high precision.

关 键 词：测量 自混合干涉仪 正弦相位调制 全光纤传感系统 

分 类 号：TN247[电子电信—物理电子学]