聚合物微腔的探针型光纤法布里-珀罗干涉仪传感器

Polymer Micro-Cavity Based Probe Type Fiber Fabry-Perot Interferometer Sensor

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一珀罗干涉仪传感器（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-180．359dB/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355．28pm/℃。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 polymer micro-cavity based probe-type fiber Fabry-Perot interferometer is demonstrated by coating PDMS at the end tip of the single mode fiber, at the same time, the refractive index （RI） and temperature sensing characteristics of the sensor are also investigated. The refractive index and temperature sensing are based on extinction ratio measurement and wavelength shift measurement, respectively. Meanwhile, the theoretical analysis of the special refractive index sensing characteristics of the sensor is conducted, which can be used to design sensors. The sensor has a simultaneously high sensitivity to refractive index and temperature, the refractive index sensitivity is -180.359 dB/RIU （RI unit） in the refractive index range of 1.3625 - 1.4206, and the temperature sensitivity is 355.28 pmFC in the temperature range of 25 ℃ - 60 ℃ The sensor has the merits of compact size and good biocompatibility. It is advantageous in applications for biochemical activity detection when compared to the conventional fiber sensors, such as tissue culture.