A constant intensity technique to improve the performances of devices based on direct absorption spectroscopy
Author:
Montori A.,De Pas M.,Giuntini M.,Siciliani De Cumis M.,Viciani S.,D’Amato F.
Abstract
Abstract We describe an all−in−fibre apparatus for Constant Intensity Direct Absorption Spectroscopy (CIDAS) for gas concentration measurements which keeps the power of a diode laser constant along the frequency sweep. The reduction of the large variation of the laser power, connected to the frequency scan, enhances the ability of detecting small variations in a background signal, resulting in an increase of the sensitivity with respect to standard direct absorption techniques. Moreover, CIDAS allows for a real−time observation of the absorption signals without any kind of post−detection processing. The apparatus has been tested with carbon dioxide (CO
Subject
Electrical and Electronic Engineering,Radiation,General Materials Science
Cited by
1 articles.
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