摘要
提出了一种用于干涉型光纤水听器信号检测的伪工作点控制方法.为了验证该方法的可行性,搭建了干涉型光纤水听器声压灵敏度测量系统,编写了实时信号采集和处理程序,对某一光纤水听器进行了测量.在频带20Hz^2.5kHz上,该光纤水听器的声压灵敏度为-156.5dB(0dB=1rad/μPa),频响波动<±0.8dB,与采用PGC调制解调方法测量的结果基本一致.由于传感部分不含有源器件,该方法实现了无源检测.另外,它还具有解调算法简单、检测频带宽等优点.
A novel pseudo working-point control detection scheme for i nterferometric fiber-optic hydrophone is reported. An experimental system,which interrogates an interferometric fiber optic hydrophone with this new method, is designed. The acoustic pressure phase sensitivity is about -156.5 dB（0 dB= 1 rad/μPa） over the frequency range of 20 Hz to 2.5 kHz with a fluctuation lower than ±0.8 dB,which accords well with the results obtained by the method of PGC demodulation. The experimental results prove this method is feasible. It has the advantages of no electric elements in the sensing head, the simplicity of signal processing and the wide frequency range of signal detection.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2008年第1期39-41,共3页
Acta Photonica Sinica
基金
国防科技大学研究生创新基金(0623)资助
关键词
光纤传感器
光纤水听器
信号检测
工作点控制
PGC调制解调
Fiber-optic sensors
Fiber-optic hydrophone
Signal detection
Working-point control
PGC demodulation
