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设计了一种在单模光纤末端涂覆聚二甲基硅氧烷(PDMS)形成聚合物微腔的探针型光纤法布里-珀罗干涉仪传感器(PFFPI),并对其折射率(RI)和温度传感特性进行了研究。其折射率和温度测量分别是基于消光比变化和波长漂移进行的,同时着重对这个器件的与众不同的折射率传感特性进行了理论分析,该理论分析可用于传感器的设计。传感器同时具有比较高的折射率灵敏度和温度灵敏度,在折射率为1.3625~1.4206的范围内折射率灵敏度为-180.359 dB/RIU(RIU表示折射率单元),在温度为25℃~60℃的范围内温度灵敏度为355.28 pm/℃。该传感器具有体积小巧和生物兼容性良好等优点,与传统光纤传感器相比其更具优势的应用就是生化活动的检测,如组织培养等。
A probe-type fiber Fabry-Perot interferometer sensor (PFFPI), which is coated with polydimethylsiloxane (PDMS) to form a polymer microcavity at the end of a single-mode fiber, is designed and its refractive index RI) and temperature sensing characteristics were studied. The refractive index and temperature measurements are based on extinction ratio changes and wavelength drift, respectively, while focusing on the device’s unique refractive index sensing characteristics of a theoretical analysis, the theoretical analysis can be used for sensor design. The sensor has high refractive index sensitivity and temperature sensitivity at the same time, and the refractive index sensitivity is -180.359 dB / RIU (RIU means the refractive index unit) in the range of the refractive index of 1.3625 to 1.4206, and in the range of 25 ° C. to 60 ° C. The internal temperature sensitivity is 355.28 pm / ° C. The sensor has the advantages of small size and good biocompatibility. Compared with the traditional optical fiber sensor, the sensor has the advantage of biochemical activity detection, such as tissue culture.