Recent Advances on Optical Sensing Using Photonic Crystal Fibers

Marques, M. B.; Magalhães, Fernão D.; Carvalho, J.R.F. Guedes de; Frazão, Orlando; Araújo, F. M.; Santos, J. L.; Ferreira, L. A.

doi:10.1063/1.3002537

Cited by 2 publications

(1 citation statement)

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“…The output of the lock-in amplifier, related to the signal coming from the sensing heads, is normalized by its DC level so that the resulting signal is independent of power fluctuations and proportional only to gas concentration. [8] A gas chamber was also developed in order to enable the variation of gas concentrations and to test the implemented setup. The chamber is hermetically sealed and has one gas input and output, as well as a pressure manometre and an optical feedthrough to allow the entrance of the fibres.…”

Section: Portable Monitoring Unitmentioning

confidence: 99%

Methane detection system based on Wavelength Modulation Spectroscopy and hollow-core fibres

et al. 2008

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An optoelectronic system for detection and monitoring of methane has been developed and implemented. The signal processing technique used in the proposed system is based on Wavelength Modulation Spectroscopy (WMS). When associated with the revolutionary microstructured fibres, this scheme revealed an effective way to measure gas concentration. Aiming the optimization of the sensing head design, the methane diffusion time inside a hollow-core fibre was evaluated. An error of 2.8% between experimental and theoretical values was obtained, thus validating the adopted model. These results were very encouraging towards the implementation of a practical unit for remote gas monitoring applications. I.

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Section: Portable Monitoring Unitmentioning

confidence: 99%