An Optical Fiber Fabry–Perot Interferometer Sensor for Simultaneous Measurement of Relative Humidity and Temperature


A simultaneous relative humidity (RH) and temperature sensor based mostly on an optical fiber Fabry–Perot interferometer is proposed and experimentally demonstrated. This sensor is made by splicing a brief length of photonic crystal fiber (PCF) to single mode fiber and coating an ultrathin polyvinyl alcohol film to the PCFs cleaved surface. The full length of this sensing head is only $sim a hundred and ten~mu $ M and also the compact size suggests that it will be used flexibly in limited house and harsh environments. Experimental results demonstrate that this sensor will simultaneously live the ambient RH and temperature by demodulating the facility amendment and wavelength shift of reflection spectrum. Consequently, the advantages of compact size, low price, high flexibility and stability, fast response, and simultaneous RH and temperature measurement ability means that the proposed sensor has an intensive range of potential applications.

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