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

D. G. Johnson | Zendy

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<title>Design of a far-infrared spectrometer for atmospheric thermal emission measurements</title>

Author(s) -

D. G. Johnson

Publication year - 2002

Publication title -

proceedings of spie, the international society for optical engineering/proceedings of spie

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.192

H-Index - 176

eISSN - 1996-756X

pISSN - 0277-786X

DOI - 10.1117/12.454254

Subject(s) - spectrometer , troposphere , infrared , far infrared , longwave , remote sensing , detector , radiative transfer , environmental science , infrared window , satellite , optics , spectral resolution , materials science , physics , atmospheric sciences , spectral line , astronomy , geology

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 can 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 micro ometers. It has been difficult to make measurements in the far infrared due to the need for liquid-helium cooled detectors and large optics to achieve adequate sensitivity and bandwidth. 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.

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