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为了实现高精度大范围应变传感信号的测量并解决单光栅匹配滤波解调系统存在的严重双值问题,基于光纤布拉格光栅匹配解调原理,设计了一种新型的光纤光栅匹配解调系统。通过将四个中心波长与传感光栅中心波长相匹配的解调光栅两两并联,并对其二次反射的传感光信号进行分析,得到了应变与光电探测器探测到的光功率之间的对应关系,建立了理论模型并进行了系统仿真。仿真结果表明该方案切实可行,不仅可以解决双值问题并且可以同时检测正负应变,在不添加驱动装置的情况下其传感测量范围可达952με。
In order to measure high-precision large-scale strain sensing signals and solve the serious double value problem of single-grating matched filter demodulation system, a novel fiber grating matching demodulation system is designed based on the theory of fiber Bragg grating matching demodulation. By connecting the four demodulation gratings whose central wavelength matches the central wavelength of the sensing grating in parallel with each other and analyzing the secondary reflected sensing optical signal, the relationship between the strain and the optical power detected by the photodetector Corresponding relations, established a theoretical model and conducted a system simulation. The simulation results show that this scheme is feasible and can not only solve the binary problem but also detect the positive and negative strain simultaneously. The sensing measurement range can reach 952με without the addition of driving device.