使用波长-时间映射和高斯滤波器的FBG传感器的高速和高分辨率询问
High-speed and high-resolution interrogation of FBG sensors using wavelength-to-time mapping and Gaussian filters
摘要：
在这项工作中，我们报告了一种新的技术，同时高速和高分辨率的光纤布拉格光栅（FBG）传感器的询问。该方法利用色散介质中的波长-时间映射效应和一对强度高斯滤波器。通过两个滤波光栅光谱之间的振幅比较来检索布拉格波长，这两个滤波光栅光谱被映射到时域波形。以这种方式，测量失真所产生的剩余功率由于光栅旁瓣被完全避免，波长测量范围是相当大的扩展相对于先前提出的方案。我们提出了一个任意带宽的FBG的审讯的数学背景。在我们的概念验证实验中，我们实现了~20 pm的灵敏度，超快速率高达264 MHz。
英文摘要：
In this work we report a novel technique for simultaneous high-speed and high-resolution interrogation of fiber Bragg grating (FBG) sensors. The method uses the wavelength-to-time mapping effect in a chromatic dispersive medium and a couple of intensity Gaussian filters. The Bragg wavelength is retrieved by means of the amplitude comparison between the two filtered grating spectrums, which are mapped into a time-domain waveform. In this way, measurement distortions arising from residual power due to the grating sidelobes are completely avoided, and the wavelength measurement range is considerably extended with respect to the previously proposed schemes. We present the mathematical background for the interrogation of FBGs with an arbitrary bandwidth. In our proof-of-concept experiments, we achieved sensitivities of ~20 pm with ultra-fast rates up to 264 MHz.
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