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Titolo:
Oxygen measurements at high pressures with vertical cavity surface-emitting lasers
Autore:
Wang, J; Sanders, ST; Jeffries, JB; Hanson, RK;
Indirizzi:
Stanford Univ, Dept Mech Engn, High Temp Gasdynam Lab, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 Gasdynam Lab, Stanford, CA 94305 USA
Titolo Testata:
APPLIED PHYSICS B-LASERS AND OPTICS
fascicolo: 7, volume: 72, anno: 2001,
pagine: 865 - 872
SICI:
0946-2171(200105)72:7<865:OMAHPW>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEMICONDUCTOR DIODE-LASERS; MODULATION SPECTROSCOPY; COMBUSTION GASES; A-BAND; TEMPERATURE; WAVELENGTH; MODE; NOISE; NM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, J Stanford Univ, Dept Mech Engn, High Temp Gasdynam Lab, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 m Lab, Stanford, CA 94305 USA
Citazione:
J. Wang et al., "Oxygen measurements at high pressures with vertical cavity surface-emitting lasers", APP PHYS B, 72(7), 2001, pp. 865-872

Abstract

Measurements of oxygen concentration at high pressures (to 10.9 bar) were made using diode-laser absorption of oxygen A-band transitions near 760 nm. The wide current-tuning frequency range (> 30 cm(-1)) of vertical cavity surface-emitting lasers (VCSELs) was exploited to enable the first scanned-wavelength demonstration of diode-laser absorption at high pressures; this strategy is more robust than fixed-wavelength strategies, particularly in hostile environments. The wide tuning range and rapid frequency response of the current tuning were further exploited to demonstrate wavelength-modulation absorption spectroscopy in a high-pressure environment. The minimum detectable absorbance demonstrated, similar to 1 x 10(-4), corresponds to similar to 800 ppm-m oxygen detectivity at room temperature and is limited by etalon noise. The rapid- and wide-frequency tunability of VCSELs should significantly expand the application domain of absorption-based sensors limited in the past by the small current-tuning frequency range (typically < 2 cm(-1)) of conventional edge-emitting diode lasers.

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Documento generato il 15/07/20 alle ore 08:14:51