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提出了一种新颖的基于虚拟仪器(VI)和可调谐激光技术的光纤光栅(FBG)传感系统,利用可调谐激光对由光纤光栅组成的传感器阵列进行波长扫描,实现了多根光栅的复用准静态解调,并结合抖动技术和反馈环结构,使得探测信号在每一根传感光栅中心波长处过零,以提高系统在测定波长偏移时的分辨力。当反馈环工作在闭环状态下时,该系统还可对单根光栅实现动态跟踪锁定,实现单根光栅的动态解调。该传感系统的数据采集采用虚拟仪器技术,通过多通道同时输入输出实现了在线实时解调。实验采用了4根光栅组成传感阵列,获得了静态多根光栅小于1με和单根光栅动态频率10 Hz时3.3 n/εHz的解调分辨力,动态应变范围在850με。
A novel fiber grating (FBG) sensing system based on virtual instrument (VI) and tunable laser technology is proposed. By using tunable laser to scan the sensor array composed of fiber grating, the multi-grating complex With quasi-static demodulation, combined with the jitter technique and the feedback loop structure, the detection signal is zeroed at the center wavelength of each of the sensing gratings to improve the resolution of the system in determining the wavelength offset. When the feedback loop works in the closed-loop state, the system can also realize the dynamic tracking and locking of a single grating to realize the dynamic demodulation of a single grating. The sensing system data acquisition using virtual instrument technology, through simultaneous multi-channel input and output real-time online demodulation. In this experiment, the sensing array composed of four gratings is used to obtain the demodulation resolution of 3.3 n / εHz when the static multi-grating is less than 1με and the single grating dynamic frequency is 10Hz. The dynamic strain range is about 850με.