中国激光, 2012, 39 (3): 0305005, 网络出版: 2012-03-01
高灵敏度加速度抵消型分布反馈有源光纤光栅水听器研究 下载: 516次
Research of High Sensitivity and Anti-Acceleration of DFB Active Fiber Grating Hydrophone
光纤光学 光纤布拉格光栅 分布式反馈光纤激光 水听器 增敏 fiber optics fiber Bragg grating distributed feedback Bragg fiber laser hydrophone sensitivity enhancement
摘要
研究了高灵敏度抗加速度型分布反馈(DFB)有源光纤光栅水听器。采用λ/4相移型掺铒光纤光栅构成DFB激光器,输出窄线宽激光,利用弹性膜片增敏方法封装有源光纤布拉格光栅,构成了高灵敏度有源光纤光栅水听器,并以两边对称的弹性膜片构成封装结构来抵消轴向加速度干扰,提高水听器在运动情况下的检测能力,并通过对结构的优化大大提高了光纤光栅水听器的耐静水压能力。研究结果表明水听器在100~1000 Hz频率范围内声相位灵敏度达到-132.7±0.7 dB(0 dB=1 rad/μPa),加速度灵敏度可做到-20 dB(0 dB=1 rad/g)以下,耐静水压可达2 MPa。
Abstract
The active fiber grating hydrophone with high sensitivity and anti-acceleration is investigated. The λ/4 phase-shift Er3+-doped fiber grating is used as a distributed feedback Bragg (DFB) narrow linewidth laser. Casing this active fiber Bragg grating (FBG) element with the elastic slice to enhance sensitivity the high sensitivity hydrophone sensor is constructed. Afterward, the ability of the detection to hydrophone motion is enhanced by using the both sides symmetrical elastic slices to encapsnlate the disturber of the axile acceleration. And then, the capability of resisthy resting water pressure is promoted via strustural optimization. In a frequency range of 100~1000 Hz the sound-phase sensitivity reached -132.7±0.7 dB (0 dB=1 rad/μPa). The acceleration sensitivity is under -20 dB (0 dB=1 rad/g). The resisting resting water pressure capability is up-to 2 MPa.
李东明, 陈军, 葛辉良, 张自丽. 高灵敏度加速度抵消型分布反馈有源光纤光栅水听器研究[J]. 中国激光, 2012, 39(3): 0305005. Li Dongming, Chen Jun, Ge Huiliang, Zhang Zili. Research of High Sensitivity and Anti-Acceleration of DFB Active Fiber Grating Hydrophone[J]. Chinese Journal of Lasers, 2012, 39(3): 0305005.