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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 21 — Jul. 20, 1999
  • pp: 4609–4622

Airborne Laser Infrared Absorption Spectrometer (ALIAS-II) for in situ atmospheric measurements of N2O, CH4, CO, HCL, and NO2 from balloon or remotely piloted aircraft platforms

David C. Scott, Robert L. Herman, Christopher R. Webster, Randy D. May, Gregory J. Flesch, and Elisabeth J. Moyer  »View Author Affiliations


Applied Optics, Vol. 38, Issue 21, pp. 4609-4622 (1999)
http://dx.doi.org/10.1364/AO.38.004609


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Abstract

The Airborne Laser Infrared Absorption Spectrometer II (ALIAS-II) is a lightweight, high-resolution (0.0003-cm-1), scanning, mid-infrared absorption spectrometer based on cooled (80 K) lead-salt tunable diode laser sources. It is designed to make in situ measurements in the lower and middle stratosphere on either a balloon platform or high-altitude remotely piloted aircraft. Chemical species that can be measured precisely include long-lived tracers N2O and CH4, the shorter-lived tracer CO, and chemically active species HCl and NO2. Advances in electronic instrumentation developed for ALIAS-I, with the experience of more than 250 flights on board NASA’s ER-2 aircraft, have been implemented in ALIAS-II. The two-channel spectrometer features an open cradle, multipass absorption cell to ensure minimal contamination from inlet and surfaces. Time resolution of the instrument is ≤3 s, allowing rapid in situ measurements with excellent spatial resolution. ALIAS-II has completed successful balloon flights from New Mexico, Alaska, and Brazil providing CH4 and N2O vertical profiles in the tropics, mid-latitudes, and high northern latitudes up to altitudes of 32 km.

© 1999 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition

History
Original Manuscript: December 4, 1998
Revised Manuscript: March 30, 1999
Published: July 20, 1999

Citation
David C. Scott, Robert L. Herman, Christopher R. Webster, Randy D. May, Gregory J. Flesch, and Elisabeth J. Moyer, "Airborne Laser Infrared Absorption Spectrometer (ALIAS-II) for in situ atmospheric measurements of N2O, CH4, CO, HCL, and NO2 from balloon or remotely piloted aircraft platforms," Appl. Opt. 38, 4609-4622 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-21-4609

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