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Gas sensors using correlation spectroscopy compatible with fibre-optic remoted operation

H.O.Edwards and J.P.Dakin

Abstract

This paper reviews methods for gas detection using real-time correlation spectroscopy. These methods involve using a gas sample in a reference cell as a matched optical filter to detect, preferentially, similar absorption spectra in a measurement cell. The methods all have the advantage of excellent selectivity, even using broadband sources, and are suitable for remote detection over optical-fibre leads. Our previously published methods using pressure and Stark modulation are reviewed. In addition, our recent theoretical treatment of the methods is presented. Finally, we describe new atmospheric-pressure measurements of gases using the method of phase-modulation spectroscopy.


Sensors and Actuators B (1993) Vol.11(1-3) pp.7-9

Southampton ePrint id: 78319

 

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Copyright University of Southampton 2006