中国激光, 2016, 43 (10): 1010003, 网络出版: 2016-10-12
基于分组测量和边沿滤波的大容量光纤光栅快速传感系统
Large Capacity and Fast FBG Sensing System Based on Marshalling Measurement and Edge Filter
光纤光学 光纤光栅传感 分组测量 边沿滤波 时分复用 fiber optics fiber grating sensing marshalling measurement edge filter time division multiplexing
摘要
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。
Abstract
A fast fiber Bragg grating (FBG) sensing system with large capacity based on marshalling measurement and edge filter is designed. Sensing gratings in traditional time division multiplexing systems are grouped according to their positions on the fiber, and these grating groups are then successively measured. The limit of detector′s dynamic range in single measurement is avoided, the reutilization of sensing gratings is realized, and the measuring distance is extended. Meantime, by using edge filtering method, fast wavelength demodulation is achieved, and the wavelength signals of all gratings in one grating group is measured once, which can reduce measurement time and improve the scanning frequency of the system effectively. The result shows that a demodulation linearity of 0.9913 is realized in the temperature sensing test of the system and the error is less than 1.36 ℃.
曹品奇, 许国良. 基于分组测量和边沿滤波的大容量光纤光栅快速传感系统[J]. 中国激光, 2016, 43(10): 1010003. Cao Pinqi, Xu Guoliang. Large Capacity and Fast FBG Sensing System Based on Marshalling Measurement and Edge Filter[J]. Chinese Journal of Lasers, 2016, 43(10): 1010003.