为了校正解调系统在三角波上升行程和下降行程对光纤布拉格光栅(FBG)波长解调结果出现的偏差, 提出一种采样点相对位置的校正算法。将三角波2个扫描行程的FBG波峰分别映射到相应的标准具原始数据中, 再对2个映射波峰在标准具光谱中的相对位置偏差进行校正, 达到减小解调偏差的目的。实验采用2支不同波长的FBG进行验证, 结果显示, 经过校正, FBG1将三角波上下扫描行程的解调偏差从12.053 pm减小到了0.476 pm, FBG2将该解调偏差从12.101 pm减小到了0.427 pm, 2支传感器的解调偏差相比校正前分别减小了25.3倍和28.3倍。

In order to calibrate deviations of demodulation system between rising slope and falling slope of triangular wave on demodulation results of FBG waves, effective calibration method of relative position to sampling point is proposed. Two FBG waves in two scanning process of triangle wave are mapped to the corresponding original data of etalon spectrum firstly. Then positional deviation of two FBG waves which is mapped into the etalon spectrum is corrected. In this way demodulation deviation of system can be reduced. Two FBGs with different wavelength to accomplish.in experiments. Results show that the wavelength deviation of FBG1 is reduced from 12.053 pm to 0.476 pm,while wavelength deviation of FBG2 is reduced from 12.101 pm to 0.427 pm. Demodulation deviations of two FBGs are decreased respectively by 25.3 times and 28.3 times than before.