功率加权法用于光纤Bragg光栅特征波长检测

Application of Weighted Wavelength Algorithm on the Demodulation of a Fiber Bragg Grating Optical Sensing System

提出了一种用于光纤Bragg光栅(FBG)传感系统中反射波位移检测的算法。采用FBG反射波波长对光功率的加权平均作为特征值进行数据处理,用于FBG传感温度补偿系统中应变参量与温度参量的分离。研究结果表明:在光源扫描步长为50pm时,使用该算法的FBG传感温度补偿系统的检测灵敏度达到传统中心波长法检测灵敏度的10倍左右。

An algorithm was proposed to interrogate the wavelength shift in a fiber Bragg grating（FBG） opttieal sensing system. This algorithm used the weighted wavelength of the reflected optical spectrum as the characteristic wavelength for data processing and tempeerature compensation to separate the strain and temperature responses. Compared with the traditional algorithm of peak power detection, this algorithm has much higher detecting sensitivity. The detecting sensitivity of the measured strain is about one tenth of that using peak power detection algorithm when the wavelength scanning step is 50 pm.