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Applied Optics

Applied Optics


  • Vol. 38, Iss. 21 — Jul. 20, 1999
  • pp: 4699–4704

Development of an IR tunable diode laser absorption spectrometer for trace humidity measurements at atmospheric pressure

Christopher S. Edwards, Geoffrey P. Barwood, Patrick Gill, Bernd Schirmer, Holger Venzke, and Adrian Melling  »View Author Affiliations

Applied Optics, Vol. 38, Issue 21, pp. 4699-4704 (1999)

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The development of a laser diode absorption spectrometer that uses a strong water vapor absorption at 1393 nm is reported. Three spectroscopic techniques were compared in ≈0.4 m of laboratory air, namely, frequency modulation, wavelength modulation, and two-tone frequency modulation spectroscopy. The first two techniques use a single-frequency modulation at 9.2 GHz and 1 kHz, respectively, generated either by a phase modulator operating at 9.2 GHz or injection current modulation at 1 kHz. The two-tone method requires modulation at two frequencies, in this case 9.19 and 9.21 GHz. It is shown that the two-tone method should provide the highest sensitivity for a trace moisture detection system.

© 1999 Optical Society of America

OCIS Codes
(010.7340) Atmospheric and oceanic optics : Water
(300.0300) Spectroscopy : Spectroscopy
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6380) Spectroscopy : Spectroscopy, modulation

Original Manuscript: January 4, 1999
Revised Manuscript: April 14, 1999
Published: July 20, 1999

Christopher S. Edwards, Geoffrey P. Barwood, Patrick Gill, Bernd Schirmer, Holger Venzke, and Adrian Melling, "Development of an IR tunable diode laser absorption spectrometer for trace humidity measurements at atmospheric pressure," Appl. Opt. 38, 4699-4704 (1999)

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