Li Yang, Liu Zhibo, Liu Yan, Ma Lin, Tan Zhongwei, Jian Shuisheng
Appl Opt. 2013 Sep 1;52(25):6359-63. doi: 10.1364/AO.52.006359.
An interferometric fiber-optic vibration sensing system using the phase-generated carrier (PGC) method is proposed and experimentally demonstrated. The sensing section consists of a Sagnac interferometer combined with a Mach-Zehnder interferometer, a length of sensing fiber is shared between the two interferometers. The PGC demodulation scheme is used to demodulate the time-varying phase shifts induced by vibrations. Spatial information can be extracted from the demodulated results. A prototype sensing system with a 628 m long sensing fiber has been tested and a spatial resolution better than 12 m is successfully achieved.
提出并通过实验验证了一种采用相位生成载波（PGC）方法的干涉型光纤振动传感系统。传感部分由一个与马赫-曾德尔干涉仪相结合的萨格纳克干涉仪组成，一段传感光纤在两个干涉仪之间共享。采用PGC解调方案来解调由振动引起的时变相位偏移。可以从解调结果中提取空间信息。对一个具有628米长传感光纤的原型传感系统进行了测试，并成功实现了优于12米的空间分辨率。
