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Proceedings Paper

Design And Performance Data Of A Space Borne Helium Cooled Infrared Limb Scanning Instrument
Author(s): D. Kampf; H. Rippel
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Paper Abstract

The paper presents a newly developed helium-cooled spectrometer and radiometer with a diffraction limited telescope. The instrument is designed for ir-measurements aboard spacecraft. The instrument uses the the well-known limb technique to detect the spatially integrated spectral emission of the atmosphere and the atmospheric structure as well. The optical layout of the telescope is optimized for high straylight rejection of the earth s radiation and for good image quality. The telescope has an off-axis Herschel type arrangement. The focus of the primary mirror is reimaged with an elliptical (secondary) mirror into the instrument s focal plane. The suppression of the earth s straylight is achieved by means of an integrated Lyot optics, which are composed of field stop, secondary mirror and Lyot stop. This technique and high quality low BRDF mirrors give the off-axis rejection necessary for limb observations. The nominal focus of the telescope coinsides with the entrance slit of a spectrometer of Ebert-Fastie type. The detectors for the spectrometer cover the wavelenghts region between 2.5 μm to 25 μm in different grating orders, which are separated by means of wavelength selecting filters. The second focal plane instrument is a detector array specially designed for the scientific requirements. This array measures the ir-radiation in 10 spectral channels. The channel selection is performed with a filter wheel near the focus of the primary mirror. As the filters are not illuminated with parallel light the filter thickness and the cryogenic refractive indices of the filters have to be carefully taken into account.

Paper Details

Date Published: 13 April 1988
PDF: 4 pages
Proc. SPIE 0868, Optoelectronic Technologies for Remote Sensing from Space, (13 April 1988); doi: 10.1117/12.943599
Show Author Affiliations
D. Kampf, Kayser-Threde GmbH (Germany)
H. Rippel, Kayser-Threde GmbH (Germany)

Published in SPIE Proceedings Vol. 0868:
Optoelectronic Technologies for Remote Sensing from Space
C. Stuart Bowyer; John S. Seeley, Editor(s)

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