压电陶瓷型光栅解调仪双边沿解调修正方法

A Double-Edge Demodulation and Correction Method of the PZT Type Grating Demodulation Instrument

为了提高光纤光栅解调仪表的速度与精度,提出了一种双边沿解调及非线性修正方法对PZT(压电陶瓷)的迟滞效应进行补偿。通过对PZT两端电压的上升、下降沿同时采集数据并进行交叉解调的方式,在提高解调速度的同时有效地消除了迟滞效应。利用1个10探测点的C波段光栅对该修正方法进行检验,修正效果较为理想,各波长的解调误差小于±5pm。

In order to improve the demodulating speed and precision of the instrument, this paper propose a double-edge demod- ulation and nonlinear correction method to modifythe hysteresis effectof the piezoelectric ceramic. The demodulating speed and accuracy of the instrument has been improved by a cross-demodulation method using the data at rising edge and failing edge of triangle voltage at the same time. The effectiveness of thenonlinear correction method has been verified using a C band grating with 10 detection points. It is found that the wavelength demodulation error is less than 5：5 pm.