摘要
研制了高性能的三维光纤矢量听水器,采用全保偏光纤结构消除偏振不稳定性影响、光频调制相位载波(PGC)技术消除随机相位漂移,实现了探测单元的全光化。优化结构设计,采用薄壁空心刚性圆柱结构作为弹性柱体,大大拓展了光纤矢量水听器的工作频带,同时保证了水听器探测灵敏度。经权威机构检测,该光纤矢量水听器的工作频带为20～2000Hz,加速度灵敏度为33dB,工作带宽内加速度灵敏度起伏小于1.4dB,1 000Hz处声压灵敏度为-155dB,具有良好的余弦指向性,指向性指数大于45dB,最大轴向不对称性小于0.4dB。
This paper reports a novel all polarization-maintaining optical fiber vector hydrophone. The all polarization-maintaining optical fiber interferometer structure can prevent signal fading due to random changes in the polarization state of the guided beams. The signal fading caused by random phase-shift in the interferometer is eliminated by the phase generated carrier（PGC） technology. The sensor is all-opti cal, which is convenient to be applied for long distance detection and transmission. The sensitivity and frequeny band of the sensor are enhanced by optimizing the structure. The acceleration sensitivity reaches 33 dB and the fluctuation is less than 1 dB in frequency band of 20--2 000 Hz. The phase sensitivity is --155 dB at 1000 Hz. The optical vector hydrophone has an excellent directivity. The maximum asymetric index is less than 0. 4 dB and the directivity index is greater than 45 dB.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2011年第12期1784-1788,共5页
Journal of Optoelectronics·Laser
基金
高等学校博士学科点专项研究基金资助项目(201043070020)
关键词
光电子学
光纤矢量水听器
加速度
保偏光纤
声压灵敏度
optoelectronics
optical fiber vector hydrophone
acceleration
polarization maintaining optical fiber
acoustic pressure sensibility
