三角形谱啁啾光纤光栅在光栅传感系统中的应用

Application of Chirped Fiber Bragg Gratings with Triangular Spectrum in the Fiber Gratings Sensor System

利用三角形谱啁啾光纤布拉格光栅(T-CFBG)的反射和时延特性,提出了一种新的基于相位检测的FBG解调方案。该方案由光强来确定传感器光栅反射波长的相位延迟角范围,由相位检测来确定在该范围的相位延迟角大小,两者结合给出传感光栅的反射波长,因此具有更高精度和更大波长检测范围。实验制作了宽带宽具有三角形反射谱的T-C FBG,并对其用于传感解调予以了模拟分析。

A new chirped fiber Bragg grating（OFBG） interrogator is proposed with triangular spectra for the grating sensor. The phase delay of the wavelength of the light reflected by the sensing grating is determined by the intensity detecting and phase detecting synchronously. The intensity detecting determines the interval of the phase delay, and the phase detecting determines the phase delay in the interval. So the has higher precision and broader wavelength span. A CFBG with triangular and broad-band spectra is fabricated. The simulation results are shown when the grating acts as interrogator in the FBG sensor systems.