摘要
论述了FBG水听器探头基元——光纤Bragg光栅(FBG)的传感特性,分析了FBG的耦合系数、反射率、反射带宽和栅长对FBG水听器传感特性的影响。通过改进FBG水听器探头封装结构,增加了其压力敏感系数。并将实验结果与标准水听器(压电型)比较,标定出FBG的声压灵敏度,在1～25KHz的声波检测范围,其响应平坦度好、信号输出稳定,改进措施是有效的。
The acoustic sensing characteristics of FBG （Fiber Bragg Grating） hydrophone are addressed and the effects of the coupling coefficient, reflectivity, grating distance and reflection wavelength bandwidth of FBG on FBG hydrophone characteristics are analyzed. By improving encapsulation structure of FBG sensing-head, the acoustic sensing-index is increased. The test result indicates that at the acoustic frequency of 1-30 kHz, compared with the standard piezo-acoustic hydrophone, the frequency response of the FBG hydrophone is very flat and the SNR of output signal is good. The improved measures are in effect.
出处
《光学与光电技术》
2005年第5期22-25,29,共5页
Optics & Optoelectronic Technology
关键词
FBG水听器
波长偏移
水声增敏
频率响应
fiber bragg grating hydrophone
wavelength shift
pressure-sensitive polymer
frequency response
