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利用重叠多光栅的随机非均匀采样来实现动态或静态应变信号传感与解调。给出了基于可调谐滤波器的重叠双光栅解调系统组成及其随机非均匀采样的实现方法,重叠多光栅可在动态应变信号测量时产生时域上的非等间隔传感脉冲,解调系统采用质心法硬件解算,结合平滑滤波方法,可同时满足测量速度与解调精度的需要。实验中通过产生周期随机变化的三角波可调谐滤波器扫描电压来实现重叠多光栅的随机非均匀采样,在重叠双光栅与平均500Hz可调谐滤波器扫描速率条件下可产生2kHz随机分布的传感脉冲,最大可实现1.9kHz的动态应变信号测量,动态应变信号的测量带宽相当于单光栅解调系统的8倍。
The use of overlapping multi-grating random non-uniform sampling to achieve dynamic or static strain signal sensing and demodulation. Based on the tunable filter based on the composition of overlapping double grating demodulation system and its implementation of random non-uniform sampling, overlapping multi-grating can generate dynamic strain signal measurement time-domain non-equidistant sensing pulse demodulation The system uses the centroid method to solve the hardware, combined with the smoothing filtering method, which can meet the needs of both measurement speed and demodulation accuracy. In the experiment, random nonuniform sampling of overlapping multi-grating is realized by generating the triangular wave tunable filter scanning voltage whose period changes randomly. When the overlapping double grating and the average scanning frequency of 500 Hz tunable filter can generate 2 kHz randomly distributed sensing pulses , The maximum achievable 1.9kHz dynamic strain signal measurement, dynamic strain signal measurement bandwidth equivalent to single grating demodulation system 8 times.