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单模光纤耦合传感器的设计
引用本文:蒋奇,隋青美,马宾.单模光纤耦合传感器的设计[J].光学精密工程,2009,17(11):2657-2664.
作者姓名:蒋奇  隋青美  马宾
作者单位:山东大学,控制科学与工程学院,山东,济南,250061 
基金项目:国家自然科学基金仪器专项资助项目,国家教育部博士学科点专项科研基金资助项目,山东省自然科学基金资助项目 
摘    要:以单模光纤耦合器的熔融区为传感元件的传感器是一种特殊和广泛应用前景的光学检测技术。本文分析了该传感器的敏感机理,依据单模光纤耦合传感器耦合输出是传感器耦合区长度和振动频率的函数关系,提出该种传感器可实现应变和振动检测。搭建了以微应变仪和等强度悬臂梁的应变和振动检测系统,设计了实验系统的每个单元,详细分析了耦合型光纤传感器的静态响应特性和温度、横向压力干扰影响,结果表明该类型传感器对应变的响应非常灵敏。通过与压电振动传感器的测试对比,得出该传感器可更好地实现低频和高频振动检测,并分析了其低频和高频的响应特性。耦合型光纤传感器耦合区材料、结构本身、制作工艺等因素将影响传感器的静、动态性能,面向实用化,需解决传感器存在的一些问题。

关 键 词:光纤耦合器  应变  振动  响应  光纤传感器
收稿时间:2008-10-16
修稿时间:2008-12-03

Design of single mode optic fiber coupling sensor
JIANG Qi,SUI Qing-mei,MA Bin.Design of single mode optic fiber coupling sensor[J].Optics and Precision Engineering,2009,17(11):2657-2664.
Authors:JIANG Qi  SUI Qing-mei  MA Bin
Affiliation:JIANG Qi,SUI Qing-mei,MA Bin(School of Control Science and Engineering,Shandong University,Jinan 250061,China)
Abstract:In order to realize the possibility of a single mode fibre coupler used as a sensor, the theory of an optic fibre coupling sensor is analyzed. According to the relation that the coupler’s coupling ratio is sensitive to the coupled fused part length change and vibration frequency, a detection technology for strain and vibration parameters is proposed. The strain and vibration experimental system based on a micro-strain instrument and a cantilever is set up and its working principle is described in detail.The strain response of the fibre coupling sensor is investigated through a micro-strain test and the effects of temperature and transverse interference on the output ratio are given. Experimental results indicate that strain response of the fibre coupling sensor is excellent and the sensor temperature remains a constant in the coupling ratio range from 10% to 90%. The dynamic experiments of a piezoelectric sensor and a coupling fiber-optic vibration sensor are investigated and a 0-50 Hz low and 4 kHz high frequency responses are approved during the vibration testing. These results show that the single-mode fibre coupling sensor can measure a vibration signal practically, meanwhile,other influencing factors including the fused part materials, coupler structures and fabrication need to be resolved for engineering applications in the future.
Keywords:optic fiber coupler  strain  vibration  optic fiber sensor
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