Balloon-Borne Cryogenic Spectrometer For Measurement Of Lower Stratospheric Trace Constituents

J. C. Brasunas; V. G. Kunde; R. A. Hanel; D . Walser; L. W. Herath; H. L. Buijs; J. N . Berube; J. McKinnon

doi:10.1117/12.966642

18 July 1986 Balloon-Borne Cryogenic Spectrometer For Measurement Of Lower Stratospheric Trace Constituents

J. C. Brasunas, V. G. Kunde, R. A. Hanel, D . Walser, L. W. Herath, H. L. Buijs, J. N . Berube, J. McKinnon

Proceedings Volume 0619, Cryogenic Optical Systems and Instruments II; (1986) https://doi.org/10.1117/12.966642
Event: O-E/LASE'86 Symposium, 1986, Los Angeles, CA, United States

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).

Citation Download Citation

J. C. Brasunas, V. G. Kunde, R. A. Hanel, D . Walser, L. W. Herath, H. L. Buijs, J. N . Berube, and J. McKinnon "Balloon-Borne Cryogenic Spectrometer For Measurement Of Lower Stratospheric Trace Constituents", Proc. SPIE 0619, Cryogenic Optical Systems and Instruments II, (18 July 1986); https://doi.org/10.1117/12.966642

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