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

Anno: 2015

Autori: Montori A., Depas M., Giuntini M., Siciliani De Cumis M., Viciani S., D’Amato F.

Affiliazione autori: CNR-INO, V.G. Sansone 1, Sesto Fiorentino (FI), 50019, Italy; LENS, University of Florence, V.N. Carrara 1, Sesto Fiorentino (FI), 50019, Italy; CNR-INO, L.go E. Fermi 6, Firenze, 50125, Italy

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

Giornale/Rivista: OPTO-ELECTRONICS REVIEW

Volume: 23 (1)      Da Pagina: 28  A: 32

Maggiori informazioni: Regione Toscana. – The authors acknowledge the financial support of Regione Toscana, in the frame of ”POR CREO FESR 2007–2013”, Project SIMPAS (Innovative Measurement Systems for the protection of Environment and Health).
Parole chiavi: Carbon dioxide; Fiber optics; Sensitivity analysis, Applied spectroscopy; Background signals; Constant power; Direct absorption; Direct absorption spectroscopies; Gas concentration measurement; Laser-based; Real time observation, Absorption spectroscopy
DOI: 10.1515/oere-2015-0002

Citazioni: 1
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-03-24
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