Precise measurement technique of long period fiber grating sensors using Fourier transform method
Precise measurement technique of long period fiber grating sensors using Fourier transform method
复制标题
傅里叶变换法长周期光纤光栅传感器精密测量技术
DOI：
10.1117/12.2265809
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Takahashi Nobuaki
中科院分区：
文献类型：
--
作者：
Nagatsuka Mayumi;Koizumi Masayoshi;Tanaka Satoshi;Wada Atsushi;Takahashi Nobuaki
采用级联啁啾光纤光栅（C-CLPG）作为传感器件，采用傅里叶变换方法进行询问技术，提出了一种长周期光纤光栅传感器的精确测量技术。在该方法中，C-CLPG的透过率表现为周期性的通道光谱，并通过获得原始和移位的通道光谱之间的交叉光谱函数来分析其应变和/或温度相关的波长移，其中交叉光谱的相位项对应于波长移。由于相位分量是通过在更宽的C-CLPG带宽上使用所有的通道光谱来确定的，因此比峰搜索方法更精确地测量应变和温度，因为波长位移是由通道光谱的一个峰的位移决定的。在实验中，通过与峰值搜索法的结果比较，给出了高精度的应变和温度测量结果。
A precise measurement technique of long period of fiber grating sensor (LPG) is demonstrated by employing a cascaded chirp LPG (C-CLPG) as a sensing device and by adopting a Fourier transform method for an interrogation technique. In this approach, transmittance of the C-CLPG exhibits periodic channeled spectrum and its strain- and/or temperature-dependent wavelength shift is analyzed by obtaining a cross-spectrum function between the original and the shifted channeled spectra, in which the phase term of the cross-spectrum corresponds to the wavelength shift. Since the phase component is determined by using all the channeled spectrum over a wider bandwidth of the C-CLPG, more precise measurements of the strain and temperature are expected than that of the peak search method in that the wavelength shift is determined by the shift of one of peaks of the channeled spectrum. In the experiment, the highly precise strain and temperature measurements are presented by comparing with the results of the peak search method.