中国激光, 2008, 35 (5): 726, 网络出版: 2008-05-20
干涉型光纤传感器中的双重降噪方法
Two Noise Reduction Methods in Interferential Optical Fiber Sensor
光纤光学 光纤传感器 双光路检测 光电负反馈 fiber optics fiber sensor twin-channel optic path balancing detection photoelectric inverse feedback
摘要
基于马赫-曾德尔(Mach-Zehnder)干涉仪结构,构造了全保偏光纤传感系统,以单频窄线宽保偏光纤激光器作为光源,采用了光源光电负反馈和双光路平衡检测双重降噪方法,降低了光源的附加强度噪声,使系统信噪比(SNR)提高了约15 dB,达到60 dB。
Abstract
A fiber sensor based on all polarization-maintaining fiber Mach-Zehnder interferometer is presented, in which the single-frequency polarization-maintaining optical fiber laser is used as a light source. An active feedback loop for laser source and a balanced-mixer receiver are adopted to suppress the noise of the sensor system. This system makes the intensity noise reduce about 15 dB, and the signal-to-noise ratio of the system is up to 60 dB.
葛强, 徐长春, 吴许强, 钱楷, 李志军, 俞本立. 干涉型光纤传感器中的双重降噪方法[J]. 中国激光, 2008, 35(5): 726. Ge Qiang, Xu Changchun, Wu Xuqiang, Qian Kai, Li Zhijun, Yu Benli. Two Noise Reduction Methods in Interferential Optical Fiber Sensor[J]. Chinese Journal of Lasers, 2008, 35(5): 726.