摘要
信号检测技术是光纤水听器的关键技术之一,提出了一种干涉型光纤水听器的简单无源零差(SPH)检测方法,它的传感部分没有任何有源器件,也无需对光源进行调制,实现起来非常简单。用Labview结合Matlab编写了信号实时采集处理系统,对光纤水听器灵敏度频响进行了测试。结果表明,在测试频带上探头平均灵敏度为-162.5dB,与国家一级计量站标定的结果一致;波动<±0.5dB,与理论分析一致。通过对灵敏度误差的详细分析,指出影响灵敏度解调的主要因素是光源功率的波动。
A simple passive homodyne（SPH） detection scheme of fiber-optic hydrophone is proposed. There are no active parts in the sensors, and there is no need to modulate the laser. This method can be realized very simply. The system of data acquisition and processing is programmed with Labview and Matlab. One fiber-optic hydrophone is tested. The average sensitivity is - 162.5 dB,and the fluctuation is smaller than ±0.5 dB. At last the sensitivity error is analysed detailedly, and the conclusions that the fluctuation of laser power is the main factor to affect the sensitivity demodulation is given.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2006年第8期982-985,共4页
Journal of Optoelectronics·Laser
关键词
光纤水听器
检测方法
无源零差
相位载波(PGC)
fiber-optic hydrophone
detection scheme
passive homodyne
phase generate carrier（PGC）
