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Proceedings Paper

The Long Wavelength Spectrometer (LWS) for ISO
Author(s): R. J. Emery; P. A. R. Ade; I. Furniss; M. Joubert; P. Saraceno
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Paper Abstract

A spectroscopic instrument for the ESA Infrared Space Observatory is described, covering the wavelength range 45 to 180 microns and with operating modes offering a choice of two resolving powers. The lower resolving power of around 230 is given by a diffraction grating system, with the spectrum recorded by a line of 10 detectors. The high resolving power of around 1.5E4 is achieved by switching a Fabry-Perot (F-P) interferometer into the parallel part of the instrument beam. Either of two F-Ps can be selected, one optimised for the 45 to 90 micron wavelength range and the other for 90 to 180 microns. The operating modes offered include differential measurement, using wavelength switching and synchronous detection, and absolute measurement with an internal chopper/reference. Development aspects of the instrument are also discussed.

Paper Details

Date Published: 1 May 1986
PDF: 7 pages
Proc. SPIE 0589, Instrumentation for Optical Remote Sensing from Space, (1 May 1986); doi: 10.1117/12.951933
Show Author Affiliations
R. J. Emery, Rutherford Appleton Laboratory (U.K.)
P. A. R. Ade, Queen Mary College (U.K.)
I. Furniss, University College London (U.K.)
M. Joubert, Laboratoire Astronomie Spatiale (France)
P. Saraceno, CNR/Istituto di Fisica dello Spazio Interplanetario (Italy)

Published in SPIE Proceedings Vol. 0589:
Instrumentation for Optical Remote Sensing from Space
John W. Lear; Andre Monfils; Sidney L. Russak; John S. Seeley, Editor(s)

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