Abstract

A humidity sensor with a low temperature sensitivity is proposed and demonstrated by coating a nanocomposite hygrometer polyacrylamide in an open interferometric cavity of a fiber Fabry–Perot interferometer. In this paper the Fabry–Perot structure is formed by splicing one short section of single mode fiber between two sections of single mode fiber with a larger offset fusing method. Experimental results show that relative humidity (RH) sensitivity of the sensor is $\sim 0.1\mathrm{nm}/(1\%\mathrm{RH})$ in the range of 38% to 78% RH and $\sim 5.868\mathrm{nm}/(1\%\mathrm{RH})$ in the range of 88% to 98% RH, respectively.

© 2012 Optical Society of America

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