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新型光纤光栅水声传感器的研究

Development of Novel Fiber Bragg Grating Underwater Acoustic Sensor

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摘要

提出了一种新型的光纤布拉格光栅(FBG)水声传感探头结构以及光纤光栅传感信号的自解调方法。利用一对匹配光栅构成推挽结构,实现了传感解调的合二为一,大大地减小了系统的复杂度;并通过筒状弹性体结构,解决了裸光纤光栅测量水声信号的灵敏度过小的问题,并具有温度补偿作用。仿真与初步实验结果表明,该水听器探头的测量动态范围超过100 dB,在100~200 dB re 1 μPa的水声压范围内,测量灵敏度为0.36 nm/Mpa。

Abstract

A new type of optical fiber underwater acoustic sensor (hydrophone) constructed with two fiber Bragg gratings (FBG) with signal self-demodulation function is presented. This fiber Bragg grating hydrophone uses a pair of matched fiber Bragg gratings with push-pull structure for both sensing and demodulating, which greatly reduces system complexity. The cylindrical structure of the hydrophone improves the sensitivity of the bare fiber Bragg grating acoustic sensors and also can compensate temperature. Simulation and preliminary experimental results indicate that the dynamic range of the hydrophone unit is beyond 100 dB and the measurement sensitivity can reach 0.36 nm/MPa for underwater acoustic pressure range 100~200 dB re 1 μPa.

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中图分类号:TN253

所属栏目:光纤光学与光通信

基金项目:国家自然科学基金(50575111)和清华大学基础研究基金(JCqn2005025)资助课题。

收稿日期:2006-11-09

修改稿日期:2007-04-10

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作者单位    点击查看

杨剑:清华大学自动化系, 北京 100084
赵勇:清华大学自动化系, 北京 100084
倪行洁:清华大学自动化系, 北京 100084

联系人作者:杨剑(Yangjian01@mails.tsinghua.edu.cn)

备注:(1983-),男,北京人,博士研究生,主要从事光纤传感技术方面的研究。

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