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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 22 — Aug. 1, 2004
  • pp: 4436–4445

Mars laser hygrometer

Christopher R. Webster, Gregory J. Flesch, Kamjou Mansour, Robert Haberle, and Jill Bauman  »View Author Affiliations


Applied Optics, Vol. 43, Issue 22, pp. 4436-4445 (2004)
http://dx.doi.org/10.1364/AO.43.004436


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Abstract

We have designed and built a miniature near-IR tunable diode laser (TDL) spectrometer for measuring in situ the water vapor mixing ratio either in the Martian atmosphere or thermally evolved from Martian soil or ice samples. The laser hygrometer uses a thermoelectrically cooled single-mode distributed-feedback TDL at 1.87 μm to scan over a selected vibration-rotation line of both H2O and CO2 near 5327.3 cm-1. A working prototype that weighs only 230 g has been built and used to generate spectra whose analysis demonstrates precision sensitivities as fine as 1 part in 106 by volume in 1 s or 0.1 part in 106 in 10 s at Martian pressures and temperatures. Absolute uncertainties of ∼5% are calculated.

© 2004 Optical Society of America

OCIS Codes
(010.7340) Atmospheric and oceanic optics : Water
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6260) Spectroscopy : Spectroscopy, diode lasers

History
Original Manuscript: November 20, 2003
Revised Manuscript: April 1, 2004
Published: August 1, 2004

Citation
Christopher R. Webster, Gregory J. Flesch, Kamjou Mansour, Robert Haberle, and Jill Bauman, "Mars laser hygrometer," Appl. Opt. 43, 4436-4445 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-22-4436


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