Author/Authors :
Chen، نويسنده , , L.H. and Li، نويسنده , , T. and Chan، نويسنده , , C.C. and Menon، نويسنده , , R. and Balamurali، نويسنده , , P. and Shaillender، نويسنده , , M. P. Neu، نويسنده , , B. W. Ang، نويسنده , , X.M. and Zu، نويسنده , , P. and Wong، نويسنده , , W.C. and Leong، نويسنده , , K.C.، نويسنده ,
Abstract :
A relative humidity fiber sensor based on Fabry–Perot interferometry configuration is presented. The proposed fiber sensor is functionalized with a thin layer of a moisture-sensitive natural polymer chitosan to form a low fineness Fabry–Perot sensor. The sensing scheme used in this work is based on the swelling effect of chitosan sensing film (degree of swelling varies as a function of relative humidity) which will induce optical path modulation when relative humidity is changed. As observed, the proposed sensor exhibits a sensitivity of 0.13 nm/%RH for relative humidity ranging from 20%RH to 95%RH with a RH uncertainty of ±1.68%RH and fast response time of 380 ms.
