摘要
基于BOTDR的布里渊散射分布式光纤传感器所检测的散射光信号非常微弱,且频带在30MHz左右,本文提出应用广义S变换对散射光信号进行幅度解调。广义S变换同时具有短时傅里叶变换和小波变换的优点。通过仿真和实验数据处理验证,基于广义S变换的解调算法可以有效提取BOTDR信号的包络信息,优于传统的Hilbert变换方法,提高了传感系统的检测性能。
The scattering optical signal based on Brillouin scattering distributed sensor is very weak and has a frequency width of about 30 MHz, so it is proposed to demodulate the scattering optical signal＇s amplitude with generalized S transform. Generalized S Transform has the advantages of short time Fourier transform and wavelet transform. By simulating and processing the experiment data, it is demonstrated that the demodulation algorithm based on generalized S transform has better result than Hilbert transform and is able to improve the detect performance of sensor.
出处
《传感技术学报》
CAS
CSCD
北大核心
2009年第4期476-479,共4页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目资助(60507002)
关键词
分布式光纤传感
包络解调
广义S变换
布里渊散射
distributed optical-fiber sense
envelope demodulation
generalized S transform
brillouin scatter
