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Vol. 95, Issue 8, August 2008, pp.65-71




Comparative Performance of Two Fiber Optic Ammonia Sensors Employing Different Sensing Materials


Jinesh Mathew1, V.V. Mahesh1,3 and P. Radhakrishnan1,2

1International School of Photonics & 2Centre of Excellence in Lasers and Optoelectronic sciences, Cochin University of Science and Technology, Cochin-22, Kerala, India

3College of Engineering, Trikaripur, Cheemeni P.O., Kasargod Dt., Kerala, India

Tel: +91 4842575848, fax: +91 4842576714, http://www.photonics.cusat.edu

E-mail: jineshtmathew@gmail.com



Received: 19 June 2008   /Accepted: 15 August 2008   /Published: 25 August 2008


Abstract: The design and fabrication of fiber based ammonia sensors employing Bromothymol blue and Chitosan as sensing elements are presented in this paper. In the presence of ammonia gas the absorption of Bromothymol blue changes while in the case of Chitosan the refractive index changes which in turn modulates the intensity of light propagating through a fiber.


Keywords: Fiber optic sensor, Evanescent wave, Bromothymol Blue, Chitosan


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