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Proceedings Paper

NO2 detection with a fiber optic evanescent wave sensor
Author(s): M.S. John; Jayan Thomas; K. P. Unnikrishnan; Periasamy Radhakrishnan; V. P. N. Nampoori; C. P. G. Vallabhan
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Paper Abstract

A novel approach for the detection of nitrogen dioxide gas is described. This optical fiber based sensor (FOS) works on the principal of evanescent wave (EW) absorption phenomenon. EWs at the uncladded portion of a multimode fiber is utilized for the senor development by replacing this region with a coating of Metallophthalocyanine, which is thermally deposited at a reduced pressure. MPcs are very sensitive to NO2 gas and there is a change in the EW absorption in the NO2 environment. Compared to other gas sensing devices, this is highly sensitive technique. The attraction of this FOS is its simple architecture and the easiness to implement.

Paper Details

Date Published: 11 November 1999
PDF: 6 pages
Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); doi: 10.1117/12.369301
Show Author Affiliations
M.S. John, Cochin Univ. of Science and Technology (Singapore)
Jayan Thomas, Cochin Univ. of Science and Technology (United States)
K. P. Unnikrishnan, Cochin Univ. of Science and Technology (India)
Periasamy Radhakrishnan, Cochin Univ. of Science and Technology (India)
V. P. N. Nampoori, Cochin Univ. of Science and Technology (India)
C. P. G. Vallabhan, Cochin Univ. of Science and Technology (India)


Published in SPIE Proceedings Vol. 3897:
Advanced Photonic Sensors and Applications
Robert A. Lieberman; Anand Krishna Asundi; Hiroshi Asanuma, Editor(s)

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