NO2 detection with a fiber optic evanescent wave sensor

M.S. John; Jayan Thomas; K. P. Unnikrishnan; Periasamy Radhakrishnan; V. P. N. Nampoori; C. P. G. Vallabhan

doi:10.1117/12.369301

11 November 1999 NO₂ detection with a fiber optic evanescent wave sensor

M.S. John, Jayan Thomas, K. P. Unnikrishnan, Periasamy Radhakrishnan, V. P. N. Nampoori, C. P. G. Vallabhan

Proceedings Volume 3897, Advanced Photonic Sensors and Applications; (1999) https://doi.org/10.1117/12.369301
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

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.

Citation Download Citation

M.S. John, Jayan Thomas, K. P. Unnikrishnan, Periasamy Radhakrishnan, V. P. N. Nampoori, and C. P. G. Vallabhan "NO₂ detection with a fiber optic evanescent wave sensor", Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); https://doi.org/10.1117/12.369301

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