Design of a far-infrared spectrometer for atmospheric thermal emission measurements

David Geoffrey Johnson

doi:10.1117/12.454254

30 January 2002 Design of a far-infrared spectrometer for atmospheric thermal emission measurements

David Geoffrey Johnson

Proceedings Volume 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV; (2002) https://doi.org/10.1117/12.454254
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Global measurements of far infrared emission from the upper troposphere are required to test models of cloud radiative forcing, water vapor continuum emission, and cooling rates. Spectra with adequate resolution could also be used for retrieving atmospheric temperature and humidity profiles,and yet there are few spectrally resolved measurements of outgoing longwave flux at wavelengths longer than 16 micrometers . It has been difficult to make measurements in the far infrared due to the need for cooled detectors and large optics to achieve adequate sensitivity. We review design considerations for infrared Fourier transform spectrometers, including the dependence of system performance on basic system parameters, and discuss the prospects for achieving useful sensitivity from a satellite platform with a lightweight spectrometer using uncooled detectors.

Citation Download Citation

David Geoffrey Johnson "Design of a far-infrared spectrometer for atmospheric thermal emission measurements", Proc. SPIE 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV, (30 January 2002); https://doi.org/10.1117/12.454254

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