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1 2015

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A constant intensity technique to improve the performances of devices based on direct absorption spectroscopy

Montori A., Pas de M., Giuntini M., Siciliani Cumis de M., Viciani S., D’Amato F.

Opto-Electronics Review

2015

Vol. 23, No. 1

28-32

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 (CO₂) and methane (CH₄), around 1.57 and 1.65 μm, respectively.