一种曲伸式DFB光纤激光水听器探头的研究  

A bending-tension style DFB fiber laser hydrophone unit

作　　者：谭波[1] 黄俊斌[1] 顾宏灿[1] 李日忠[1] 何琳[2] 

机构地区：[1]海军工程大学兵器工程系,武汉430033 [2]海军工程大学振动与噪声研究所,武汉430033

出　　处：《海军工程大学学报》2008年第4期91-96,共6页Journal of Naval University of Engineering

摘　　要：为了提高DFB（分布反馈式）光纤激光水听器的声压灵敏度，改善其动态特性，设计了一种曲伸式DFB光纤激光水听器探头结构。该结构在保持激光器原有优点的同时，通过增大声压作用面积并将压力转化为对激光腔的轴向应变，有效地实现了声压增敏，同时通过机械结构改善了水听器的动态特性。利用有限元软件ANSYS对该结构进行了优化设计，加工制作了各构件并对DFB光纤激光器进行了封装，制作出长度约80mm、直径仅6mm的水听器原型样品并进行了实验研究。实验结果表明，采取该种形式的结构对DFB光纤激光器进行封装后，探头的声压灵敏度提高了约17．5dB，在500～1500Hz频率范围内具有较平坦的灵敏度响应。To enhance the pressure sensitivity of DFB fiber laser hydrophone and improve its dynamical characteristics, this paper presented a structure design of bending-tension style DFB fiber laser hydrophone unit. Based on the original advantages of the laser, the pressure sensitivity was enhanced effectively by increasing the pressure activated area and transforming the radial pressure to axial strain in the laser, and the dynamical characteristics were improved by means of the mechanical structure. After the Structure was optimized by ANSYS, the parts were fabricated and the DFB fiber laser was encapsulated with them. The hydrophone prototype is 80 mm in length and 6 mm in diameter. The experiment results show that with the structure, the pressure sensitivity increases about 17.5 dB, and a flat curve of frequency versus response is obtained in the frequency range of 500-1 500 Hz.

关 键 词：DFB光纤激光器 水听器 声压灵敏度 动态特性 

分 类 号：TB565.2[交通运输工程—水声工程]