Sensors & Transducers Journal (ISSN 1726- 5479) |
|
Sensors & Transducers Journal 2009 Sensors & Transducers Journal 2008 Sensors & Transducers Journal 2007 2000-2002 S&T e-Digest Contents
|
||
|
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
Click <here> or title of paper to download the full pages article (1.06 Mb)
|
1999 - 2010 Copyright ©, International Frequency Sensor Association (IFSA). All Rights Reserved.
Home - News - Links - Archives - Tools - Standardization - Patents - Marketplace - Projects - Wish List - Subscribe - Search - Membership - Submit Press Release
Members Area -Sensors Portal -Training Courses - S&T Digest - For advertisers - Bookstore - Forums - Polls - Sensor Jobs - e-Shop - Site Map