摘要
在详细分析光纤Bragg光栅(FBG)振动传感原理的基础上,设计了基于悬臂梁结构的光纤光栅传声器。系统采用结构简单、解调速度快的线性斜边滤波解调方法,选用1 531 nm/1 551 nm的CWDM作为滤波器件,其边带斜率为13 dB/nm.分别进行了单频信号(300 Hz和4 kHz)测试实验及声音信号测试实验,表明该传声器具有良好的频率检测性能和较高的信噪比,可以无失真地传递人的声音。而且,该系统可以实现光源复用,降低系统成本。
The theory of optical fiber Bragg grating （FBG） vibration sensor was analyzed in detail. Then FBG microphone was designed based on cantilever structure. Linear tilt filtering demodulation with simple structure and high speed was adopted. CWDM （ 1 531 nm/1 551 nm） was used as filter,whose slope was 13 dB/nm. Single frequency signals （300 Hz and 4 kHz） and voice signals were chosen to test the grating microphone. The results indicate that the system has excellent frequency testing ability with higher SNR and it can transmit voice signals of human without distortion. Moreover, optical source can be multiplexed to reduce the price of the system.
出处
《仪表技术与传感器》
CSCD
北大核心
2009年第10期10-12,共3页
Instrument Technique and Sensor
基金
山东省自然科学基金项目(Z2006G06)
