NDLI: Improvement of the IRAM 30-m telescope from temperature measurements and finite-element calculations

Content Provider	IEEE Xplore Digital Library
Author	Greve, A. Bremer, M. Penalver, J. Raffin, P. Morris, D.
Copyright Year	1963
Abstract	Millimeter wavelength radio telescopes built in a conventional way from steel and aluminum require elaborate thermal control to guarantee small structural deformations and good observational performance. We describe the temperature monitoring system of the Institut de Radioastronomie Millime/spl acute/trique 30-m telescope and the use of temperature measurements in finite-element calculations of structural deformations. These calculations reproduce with good precision the measured thermal deformations of the telescope and allow the investigation and localization of thermally important elements in the telescope structure. The data are used for calculation of temperature induced main reflector surface deformations and of the associated actual beam pattern, and for prediction and real-time correction of the focus. The pointing cannot be fully predicted since the available finite-element model does not include the Nasmyth focus cabin (and the concrete pedestal). The long-term investigation of the telescope's thermal behavior led to an improvement of the thermal control system and to a better performance of the telescope.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	851
Ending Page	860
Page Count	10
File Size	1120292
File Format	PDF
ISSN	0018926X
Volume Number	53
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Telescopes Temperature measurement Finite element methods Millimeter wave measurements Radio astronomy Steel Aluminum Radio control Temperature sensors Predictive models measurements Antennas mechanical factors
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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