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Proceedings Paper

Balloon-Borne Cryogenic Spectrometer For Measurement Of Lower Stratospheric Trace Constituents
Author(s): J. C. Brasunas; V. G. Kunde; R. A. Hanel; D . Walser; L. W. Herath; H. L. Buijs; J. N . Berube; J. McKinnon
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Paper Abstract

A liquid-nitrogen cooled, multi-detector Fourier transform spectrometer has been constructed to measure minor stratospheric constituents via high resolution, earth-limb emission spectroscopy from a balloon-borne platform. Cryogenic cooling combined with the use of extrinsic silicon photoconductor detectors cooled to liquid-helium temperature allows the detection of weak emission features of gaseous species. The spectrometer has two basic scan modes: the first mode records the continuous spectrum from 650-2100 cm with 0.2 cm resolution; the second records simyltaneously four, preselected, narrow intervals (-175 cm bandpass, each) with 0.02 cm resolution, unapodized. Filtering of the interferogram signal is done by real-time, digital signal processing. The most important feature of this flat mirror Michelson, with respect to remote balloon-borne operation, is the dynamic alignment system which maintains the relative parallelism of the two flat reflectors of the interferometer. Species identified to date in data obtained during a November 6, 1984 flight include: CO2, 03, H20, CH4, HNO3, N20, NO2, NO, CC13F (Freon-11) and CF2C12 (Freon-12).

Paper Details

Date Published: 18 July 1986
PDF: 9 pages
Proc. SPIE 0619, Cryogenic Optical Systems and Instruments II, (18 July 1986); doi: 10.1117/12.966642
Show Author Affiliations
J. C. Brasunas, NASA/Goddard Space Flight Center (United States)
V. G. Kunde, NASA/Goddard Space Flight Center (United States)
R. A. Hanel, NASA/Goddard Space Flight Center (United States)
D . Walser, NASA/Goddard Space Flight Center (United States)
L. W. Herath, Science Systems and Applications, Inc. (United States)
H. L. Buijs, Bomem, Inc. (Canada)
J. N . Berube, Bomem, Inc. (Canada)
J. McKinnon, Bomem, Inc. (Canada)

Published in SPIE Proceedings Vol. 0619:
Cryogenic Optical Systems and Instruments II
Ramsey K. Melugin, Editor(s)

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