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基于迈克尔逊(Michelson)干涉仪(MI)原理,结合光纤传感器的特性,设计和实现了一种单模光纤(SMF)偏芯干涉仪结构光纤折射率传感器,并针对蔗糖溶液进行了折射率的测量。实验结果表明:这种传感器的传感范围在1.33～1.39时,特征波长与外界折射率有单调的递减变化关系,蔗糖折射率每变化0.01时,特征波长平均变化约为0.12nm。这种传感器结构简单,灵敏度较高,能够实现液体折射率与浓度变化的在线检测。
Based on the principle of Michelson interferometer (MI), combined with the characteristics of optical fiber sensors, a single mode fiber (SMF) eccentricity interferometer structured fiber refractive index sensor was designed and implemented. According to the refractive index of sucrose solution measuring. The experimental results show that the characteristic wavelength has a monotonous decreasing relationship with the outside refractive index when the sensor’s sensing range is 1.33 ~ 1.39. The average change of the characteristic wavelength is about 0.12nm for every 0.01 of the refractive index of sucrose. This kind of sensor has the advantages of simple structure and high sensitivity, and can realize on-line detection of liquid refractive index and concentration change.