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应用分组测量和边沿滤波实现了大容量光纤布拉格光栅(FBG)快速传感系统的设计。在传统的时分复用光纤光栅传感系统中对传感光栅按位置进行分组,然后按组分别进行测量,避免了单次测量中探测器动态范围的限制,对其进行重复利用,延长了系统的测量距离;同时利用边沿滤波法实现了快速的波长解调,能够在一次测量中解调出该分组所有光栅的波长信号,大幅加快了系统的测量速度,有利于实现更高的扫描频率。实验结果表明,本系统在温度传感测试中获得了0.9913的解调线性度,误差在1.36℃以内。
The application of packet measurement and edge filtering has realized the design of large-capacity fiber Bragg grating (FBG) fast sensing system. In the traditional time-division multiplexing FBG sensing system grouped according to the position of the sensor grating, and then measured by group, to avoid the limit of the dynamic range of the detector in a single measurement, to be reused to extend the system Of the measurement distance; at the same time the use of edge filtering to achieve a fast wavelength demodulation can demodulate all the grating in one measurement wavelength signal, substantially speeding up the measurement speed of the system is conducive to achieving a higher scanning frequency. The experimental results show that the system obtained 0.9913 demodulation linearity in the temperature sensing test, the error is within 1.36 ℃.