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为了提高基于压电陶瓷(PZT)驱动的可调谐法布里-珀罗(F-P)型滤波器解调的光纤布拉格光栅(FBG)传感系统的实时数据采集速度和测量精度,提出并行处理技术和交流转直流(ACDC)修正方法。通过并行处理技术,可调谐F-P滤波器连续采样,PZT磁滞性得到抑制,提高了系统实时数据采集速率和测量精度。针对AC驱动电压与F-P滤波器腔长之间的非线性关系,提出AC-DC修正方法,将AC电压下的FBG波长中心位置拟合为DC电压下的中心位置,减小了FBG中心波长的测量误差。实验表明,系统实时数据采集速率最大可提高1倍,应变测量的随机误差降低95%,动态应变传感的灵敏度优于1με,实测应变量与理论计算结果之间的误差小于4%。
In order to improve real-time data acquisition speed and measurement precision of fiber Bragg grating (FBG) sensing system based on PZT driven tunable Fabry-Perot (FP) filter, parallel processing technique And AC-DC (ACDC) correction methods. Through parallel processing technology, tunable F-P filter continuous sampling, PZT hysteresis is suppressed, improve the system real-time data acquisition rate and measurement accuracy. Aiming at the nonlinear relationship between AC driving voltage and FP filter cavity length, an AC-DC correction method is proposed. The center position of FBG wavelength under AC voltage is fitted to the central position under DC voltage and the center wavelength of FBG is reduced Measurement error. Experiments show that the real-time data acquisition rate of the system can be increased by 1 time, the random error of strain measurement can be reduced by 95%, the sensitivity of dynamic strain sensing can be better than 1με, and the error between measured strain and theoretical calculation can be less than 4%.