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Spectral Analysis and Application in Weak and High-frequency Signal of Optical Fiber Sensors

Abstract

在光纤传感系统中,微弱传感信号和高频传感信号的精确检测一直是研究的热点。微弱的光纤传感信号易受到检测仪器的本底噪声或者外界环境的干扰,经常淹没在噪声中,此时无法对微小传感变量进行精确判断。现今提高光纤传感器系统检测精度的方法大都为对光纤传感器的结构进行改进或对传感信号进行时域的降噪处理。在结构改进方面可以采用低噪声高放大倍数的光电转换电路或在解调系统中引入干涉仪等,但这些方式都会增加的传感系统的成本及复杂度,特别是干涉仪的引用还会降低系统的抗干扰性。对传感信号进行降噪处理如采用小波变换,神经网络和相关检测等算法提升系统传感精度的范围有限,而且算法繁琐降噪过程比较耗时,不适合光纤传感系统实时监测...The weak and high-frequency optical fiber sensor signal detection is a research hot spot. The optical fiber sensor signal is affect by some external disturbance such as temperature or vibration. The weak sensor signal is always drown in the background noise. The improvemence of the fiber sensor structure or some denoise signal processings in time domain can enhance the accuracy of the fiber sensor...学位:工学博士院系专业:信息科学与技术学院_电路与系统学号:2312011015407

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