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Proceedings Paper

Aircraft laser infrared absorption spectrometer (ALIAS) for polar ozone studies
Author(s): Chris R. Webster; Randy D. May
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Paper Abstract

The ALIAS instrument is a very high resolution (0.0003/cm) scanning, tunable diode laser spectrometer designed to make direct, simultaneous measurements of NO2, HNO3, HCl, CH4, and either O3 or N2O (including vertical profiles of CH4 and N2O) in the polar stratosphere at sub-part-per-billion level sensitivities over integration times from 3 to 30 s. Unique features include a sample inlet/throttle system designed to achieve near-isokinetic sampling, in PSC events, an in-flight wavelength reference cell rack, mechanical fringe-spoilers, a four-laser/four-detector dewar with 24-hr hold-time operating at a fixed temperature without electrical regulation, and in-flight fast correlation routines for spectral drift compensation prior to spectral addition. Instrument design and test flight results are discussed in the light of ALIAS's role in the Winter 1991 Arctic aircraft stratospheric ozone campaigns out of Fairbanks, Alaska, and Bangor, Maine.

Paper Details

Date Published: 1 December 1991
PDF: 8 pages
Proc. SPIE 1540, Infrared Technology XVII, (1 December 1991); doi: 10.1117/12.48729
Show Author Affiliations
Chris R. Webster, Jet Propulsion Lab. (United States)
Randy D. May, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 1540:
Infrared Technology XVII
Bjorn F. Andresen; Marija Scholl; Irving J. Spiro, Editor(s)

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