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基于干涉解调技术的光纤激光器水声传感系统

Fiber Laser Acoustic Pressure Sensing System Based on Interferometric Demodulation Technique

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摘要

分析了基于Michelson干涉解调技术的光纤激光器水声传感的原理,在一段掺铒光纤中写入具有π相移的光纤光栅构成光纤激光器,水声压力作用在激光器上引起激光工作波长的变化;采用基于3×3耦合器的偏振无关的非平衡光纤Michelson干涉仪将激光波长变化转化为干涉仪的相位变化;干涉仪的输出由光电探测器转换后使用DSP进行信号解调。针对3×3耦合器分光比不对称的问题,本文提出利用实时调整幅度的2路干涉信号进行解调的方案,该方案不需要3×3耦合器有严格的分光比,消除了外界环境对解调输出的非线性影响。水声探测实验表明,光纤激光器水声传感系统的声压灵敏度为-166.5dB(参考值1 rad/μPa),解调结果与水声信号具有良好的线性关系。

Abstract

The theoretical acoustic sensing characteristics of a fiber laser are described based on Michelson interferometric demodulation technique.The fiber laser sensor is made by writing Bragg grating with π phase-shift into a section of Er-doped fiber.Acoustic pressure applied on the fiber laser induces laser wavelength shift.And a polarization-insensitive unbalanced Michelson fiber interferometer based on the 3×3 coupler is employed to transform the wavelength shift into phase shift of the interferometer.The signals are processed by Digital Signal Processing(DSP) to demodulate the phase shift.Based on the asymmetry characteristic of 3×3 coupler output signal,a novel algorithm for demodulating the phase shift is proposed.By employing two output signals whose amplitude can be adjusted in real time,it don't need uniform splitting ratio of coupler.The sensitivity experiment shows that the sensitivity is-166.5 dB(re 1 rad/μPa) when a 200 m path imbalanced readout interferometer is used,and the system output is linear to the pressure applied on the fiber laser sensor.

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中图分类号:TN2481

所属栏目:光纤技术

基金项目:国家安全重大基础研究(973)项目资助课题;国防重点实验室基金项目资助课题

收稿日期:2008-06-27

修改稿日期:2008-08-26

网络出版日期:0001-01-01

作者单位    点击查看

顾宏灿:海军工程大学 兵器工程系,武汉 430033
黄俊斌:海军工程大学 兵器工程系,武汉 430033
苑秉成:海军工程大学 兵器工程系,武汉 430033
谭波:海军工程大学 兵器工程系,武汉 430033
李日忠:海军工程大学 兵器工程系,武汉 430033
李玉:海军工程大学 兵器工程系,武汉 430033

联系人作者:顾宏灿(guhongcan@yahoo.com.cn)

备注:顾宏灿|男|(1980-)(汉族),江苏靖江人,博士研究生,主要研究光纤传感。

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引用该论文

GU Hong-can,HUANG Jun-bin,YUAN Bing-cheng,TAN Bo,LI Ri-zhong,LI Yu. Fiber Laser Acoustic Pressure Sensing System Based on Interferometric Demodulation Technique[J]. Opto-Electronic Engineering, 2008, 35(12): 73-77

顾宏灿,黄俊斌,苑秉成,谭波,李日忠,李玉. 基于干涉解调技术的光纤激光器水声传感系统[J]. 光电工程, 2008, 35(12): 73-77

被引情况

【1】顾宏灿,黄俊斌,程玲,杨光,毛欣. 20~1 250 Hz光纤激光加速度传感系统设计. 中国光学, 2017, 10(4): 469-476

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