Distributed Fiber Optic Interferometric Geophone System Based on Draw Tower Gratings  

作　　者：Ruquan XU Huiyong GUO Lei LIANG 

机构地区：[1]National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan, 430070, China

出　　处：《Photonic Sensors》2017年第3期246-252,共7页光子传感器（英文版）

基　　金：Acknowledgment This work was partly supported by the Major Program of the National Natural Science Foundation of China （Grant No. 61290311）, the Fundamental Research Funds for the Central Universities （Grant No. 2015Ⅲ056）, and Key Consulting Project of Chinese Academy of Engineering （Grant No. 2016-XZ-13）.

摘　　要：A distributed fiber optic interferometric geophone array based on draw tower grating （DTG） array is proposed. The DTG geophone array is made by the DTG array fabricated based on a near-contact exposure through a phase mask during the fiber drawing process. A distributed sensing system with 96 identical DTGs in an equal separation of 20 m and an unbalanced Michelson interferometer for vibration measurement has been experimentally validated compared with a moving-coil geophone. The experimental results indicate that the sensing system can linearly demodulate the phase shift. Compared with the moving coil geophone, the fiber optic sensing system based on DTG has higher signal-to-noise ratio at low frequency.A distributed fiber optic interferometric geophone array based on draw tower grating （DTG） array is proposed. The DTG geophone array is made by the DTG array fabricated based on a near-contact exposure through a phase mask during the fiber drawing process. A distributed sensing system with 96 identical DTGs in an equal separation of 20 m and an unbalanced Michelson interferometer for vibration measurement has been experimentally validated compared with a moving-coil geophone. The experimental results indicate that the sensing system can linearly demodulate the phase shift. Compared with the moving coil geophone, the fiber optic sensing system based on DTG has higher signal-to-noise ratio at low frequency.

关 键 词：Fiber optic sensing vibrating sensing draw tower grating interferometric geophone 

分 类 号：TN25[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]