耦合型单模光纤传感器用于振动测量研究

Study of Coupling Single-Mode Fiber-Optic Sensor for Vibration Measuring

讨论了一种以单模光纤耦合器的熔融区为敏感单元的耦合型单模光纤传感器。分析了该传感器的敏感机理,依据单模光纤耦合器耦合输出与耦合区长度和折射率的函数关系,提出该种传感器可实现振动测量。搭建了基于等强度悬臂梁的振动检测系统,通过与压电振动传感器的对比测试表明该传感器可更好地实现振动信号的测量,并分析了其振动响应特性。实验证明耦合型单模光纤传感器可以用于振动信号的测量。

A new kind of coupling single-mode fiber-optic sensor used the coupler＇s coupling region as sensitive unite was presented.The theory of coupling single-mode fiber-optic sensor was analyzed.According to the relation between the coupler＇s coupling ratio with the length and refractive index of its coupling region,vibration measuring technology with this kind of sensor was put forward.The vibration experimental system based on equal strength cantilever was setup and presented in detail.Dynamic experiments of coupling single-mode fiber-optic sensor compared with piezoelectric sensor were accomplished,and good response of coupling single-mode fiber-optic sensor was approved.Experimental results indicate that the coupling single-mode fiber-optic sensor is feasible to measure vibration signal practically.