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Proceedings Paper

Analysis of thermal disturbances on the long-wavelength (LW) channel of a double pendulum IR spectrometer for space research
Author(s): Bortolino Saggin; Francesco Angrilli; Gianandrea Bianchini; Roberto Da Forno; Vittorio Formisano
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Paper Abstract

This paper focuses on a planetary Fourier spectrometer (PFS), an infrared device designed to be flown onboard the Russian-International Mission `Mars '94,' whose launch, planned for November 1994, has just been postponed to 1996. The design and production of the whole instrument results from international cooperation involving Russia, Poland, Germany, Spain, France and Italy; in particular, the University of Padova is responsible for the mechanical and thermal design of the interferometer, while the electronics are in the care of the CNR Institute of Interplanetary Space Physics in Frascati, Italy. This paper summarizes part of the work done at the University of Padova concerning thermal analysis and design; most of it was a preliminary study aimed at evaluating thermal disturbances and therefore the features of the thermal control system. Disturbances analyzed concern the long-wavelength LW channel operating in the range between 6 and 45 micrometers ; the effects of infrared emission of elements in the sensor field of view were evaluated and various solutions compared. With the implemented thermal control system the disturbance arising from the changes of sensor housing temperature is below 10% of the sensor electric noise while that resulting from structural parts in the sensor field of view is four orders of magnitude smaller. Temperature variations of the dichroic filter leads to errors comparable with sensor noise; the attempt of reducing the effect by stabilizing its holding structure proved ineffective, therefore calibration cycle must be more frequently performed.

Paper Details

Date Published: 30 September 1994
PDF: 8 pages
Proc. SPIE 2266, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research, (30 September 1994); doi: 10.1117/12.187570
Show Author Affiliations
Bortolino Saggin, Univ. of Padova (Italy)
Francesco Angrilli, Univ. of Padova (Italy)
Gianandrea Bianchini, Univ. of Padova (Italy)
Roberto Da Forno, Univ. of Padova (Italy)
Vittorio Formisano, Institute of Interplanetary Space Physics/CNR (Italy)

Published in SPIE Proceedings Vol. 2266:
Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research
Jinxue Wang; Paul B. Hays, Editor(s)

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