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Titolo:
Wavelength-modulation laser hygrometer for ultrasensitive detection of water vapor in semiconductor gases
Autore:
Hovde, DC; Hodges, JT; Scace, GE; Silver, JA;
Indirizzi:
SW Sci Inc, Santa Fe, NM 87505 USA SW Sci Inc Santa Fe NM USA 87505SW Sci Inc, Santa Fe, NM 87505 USA Natl Inst Stand & Technol, Chem Sci & Technol Lab, Gaithersburg, MD 20899 USA Natl Inst Stand & Technol Gaithersburg MD USA 20899 ersburg, MD 20899 USA
Titolo Testata:
APPLIED OPTICS
fascicolo: 6, volume: 40, anno: 2001,
pagine: 829 - 839
SICI:
0003-6935(20010220)40:6<829:WLHFUD>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
TUNABLE DIODE-LASERS; TRACE MOISTURE; FREQUENCY-MODULATION; ABSORPTION-SPECTROSCOPY; 2ND-HARMONIC DETECTION; COEFFICIENTS; SPECTROMETRY; CELL; H2O;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Hovde, DC SW Sci Inc, 1570 Pacheco St,Suite E-11, Santa Fe, NM 87505 USA SW Sci Inc 1570 Pacheco St,Suite E-11 Santa Fe NM USA 87505 USA
Citazione:
D.C. Hovde et al., "Wavelength-modulation laser hygrometer for ultrasensitive detection of water vapor in semiconductor gases", APPL OPTICS, 40(6), 2001, pp. 829-839

Abstract

Water vapor is measured by use of a near-infrared diode laser and wavelength-modulation absorption spectroscopy. Humidity levels as low as 5 nmol/mol[1 nmol/mol = 1 ppb (1 ppb equals 1 part in 10(9))] of water vapor in air are measured with a sensitivity of better than 0.2 nmol/mol (3 sigma). The sensitivity, Linearity, and stability of the technique are determined in experiments conducted at the National Institute of Standards and Technology, Gaithersburg, Maryland, by use of the low frost-point humidity generator over the range from 5 nmol/mol to 2.5 mu mol/mol of water vapor in air. The pressure-broadening coefficients for water broadened by helium [0.0199(6) cm(-1) atm(-1) HWHM] and by hydrogen chloride [0.268(6) cm(-1) atm(-1) HWHM] are reported for the water line at 1392.5 nm. (C) 2001 Optical Society of America OCIS codes: 120.0120, 120.6200, 300.0300, 300.1030, 300.6260, 300.6380.

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Documento generato il 30/03/20 alle ore 12:57:53