A novel fiber Bragg grating sensor interrogation system utilizing a tunable Fabry-Perot filter
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摘要: 为了进一步提高光纤光栅解调系统的性能,提出和研究了一种新颖的基于可调谐F-P(Fabry-Perot)滤波器的光纤光栅解调技术,并以此为基础构建了探测系统。系统使用一个固定波长的参考光纤光栅作为波长参考元件,通过对传感光纤光栅与参考光纤光栅的波长测量与差值运算,消除了可调谐FP滤波器腔长漂移对测量精度的影响。给出压电陶瓷电压对应的伸长量,有效地减小了压电陶瓷非线性对测量的影响,提高了光纤光栅波长的测量精度。在测量范围内,最大非线性偏差为0.5%。Abstract: To improve the performance of FBG interrogation system,a novel fiber Bragg grating sensor interrogation system based on a tunable fiber Fabry-Perot (FFP) filter was demonstrated.Firstly,a reference fiber Bragg grating (FBG) was used as a wavelength reference element.By measuring the wavelength difference between reference FBG and sensor FBG,the drift of tunable FFP filter's cavity length was compensated.Secondly,a quadratic fit function wa s made with software based on experiment results.This function showed a good fit to the relationship between the displacement of PZT and control voltage.It was used to calculate the wavelength of the sensing FBG.In experiment,a strain of 0~1800 με was applied to the sensing FBG and the maximum nonlinearity deviat ion of measured wavelength was 0.5%.Experiment results show that the measured er ror caused by the drift of FFP filter's cavity length and PZT's nonlinearity is greatly reduced and a higher accuracy is obtained.
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