具有实时监测能力的光纤光栅传感系统时域地址查询技术  

Time-Domain Addressing Technique for Fiber Bragg Grating Sensor System with the Function of Real-Time Monitoring

作　　者：余有龙[1] 刘盛春[2] 谭华耀[3] Luenfu Lui 

机构地区：[1]暨南大学物理系,广州510632 [2]黑龙江大学光纤技术研究所,哈尔滨150080 [3]香港理工大学电机工程系

出　　处：《光学学报》2005年第7期865-868,共4页Acta Optica Sinica

基　　金：国家自然科学基金委员会与中国节能投资公司联合研究基金(60177029);广东省自然科学基金(04105843);教育部新世纪优秀人才支持计划;黑龙江省01年杰出青年基金的部分资助

摘　　要：时钟信号控制下的脉冲宽带光源发出的光波,进入4个光栅组成的间距为10m的光栅串。利用受同一时钟信号控制的1×4模拟电子开关,将各传感元的反射光脉冲依次分配至相应的输出信道,实现时域地址查询,并对各传感元位置的待测应变进行实时监测。引入非平衡迈克耳孙干涉解调装置,将来自传感光栅的受待测应变诱导而至的波长漂移信息变为相移信息,定标后便可实现传感信号的解调。1556nm波长时,系统传感灵敏度的实验值为1.658°/με,与理论值1.673°/με基本吻合。The emission of light wave from a pulsed broadband source controlled by a clock is injected into a four-element fiber Bragg grating sensor array. A technique of time-domain addressing is introduced to interrogate the gratings spaced 10 m apart by employing a 1 × 4 analog electrical switches, which is controlled by the same clock. The switches allocate the pulses reflected by the sensor elements into corresponding output channels to make the system performing the function of real-time monitoring the measurand. Demodulated with an unbalanced Michelson interferometer, which converts the wavelength shifts to phase changes, the system is demonstrated to be with a sensing sensitivity of 1.658°/μΕ at the wavelength of 1556 nm. It matches the theoretical value of 1.673°/μΕ basically.

关 键 词：光纤光学 光纤传感 光纤光栅 传感网络 时域地址查询 多信道输出 实时监测 干涉解调 

分 类 号：TN929.11[电子电信—通信与信息系统] TP212.1[电子电信—信息与通信工程]