Distributed Fiber Optic Interferometric Geophone System Based on Draw Tower Gratings

被引：3

作者：

Xu, Ruquan ^{[1
]}

Guo, Huiyong ^{[1
]}

Liang, Lei ^{[1
]}

机构：

[1] Wuhan Univ Technol, Natl Engn Lab Fiber Opt Sensing Technol, Wuhan 430070, Hubei, Peoples R China

来源：

PHOTONIC SENSORS | 2017年 / 7卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Fiber optic sensing; vibrating sensing; draw tower grating; interferometric geophone; SENSOR; SENSITIVITY; VIBRATION;

D O I：

10.1007/s13320-017-0408-2

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

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.

引用

页码：246 / 252

页数：7

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