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 spectroscopyDOI: 10.1515/oere-2015-0002Citazioni: 1dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-03-24Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui