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Vol. 116, Issue 5, May 2010, pp. 131-138




Angle-tip Fiber Probe as Humidity Sensor


Pabitra NATH

Department of Electronic and Communication Technology, Gauhati University,

Guwahati 781014, Assam, India

E-mail: pnath07@gmail.com



Received: 16 January 2010   /Accepted: 24 May 2010   /Published: 31 May 2010


Abstract: In this paper, I present a simple fiber optic relative humidity sensor (FORHS) using an angled-tip multimode optical fiber. The sensing region is fabricated by coating moisture sensitive Cobalt Chloride (CoCl2) doped polyvinyl alcohol (PVA) film on the surface of fiber optic tip. Light signal introducing from flat-end of the fiber is back-reflected at the fiber tip-air interface by the effect of total internal refection. The change of relative humidity (RH) in the outstanding medium affects of evanescent field absorption at the fiber tip-sensing film interface thus, modulates the back-reflected signal. With the present sensing investigation, RH ranging from 5 % to 95 % can be measured with high degree of repeatability and has a fast response time of about 2 seconds.


Keywords: Fiber optic sensor, Relative humidity, Angled-tip fiber probe


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