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Proceedings Paper

Remotely operated infrared radiometer for the measurement of atmospheric water vapor
Author(s): David A. Naylor; Bradley G. Gom; Ian S. Schofield; Gregory J. Tompkins; Ian M. Chapman
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Paper Abstract

Astronomical arrays operating at (sub)millimeter wavelengths are seriously compromised by rapid variations in atmospheric water vapor that distort the phase coherence of incoming celestial signals. The signal received by each antenna of the array suffers a phase delay that varies rapidly with time and from antenna to antenna. Unless corrected, these distortions limit the coherence time of the array and seriously compromise its sensitivity and image quality. Building on the success of a prototype infrared radiometer for millimeter astronomy (IRMA), which operates in the 20μm region to measure the column abundance of atmospheric water vapor, this paper describes the latest version of the IRMA concept, which has been developed for operation at Llano de Chajnantor, future site of the Atacama Large Millimeter Array (ALMA). Since there is presently limited infrastructure at the Chilean site the design must pay careful attention to all aspects of remote operation.

Paper Details

Date Published: 23 January 2003
PDF: 11 pages
Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003); doi: 10.1117/12.450553
Show Author Affiliations
David A. Naylor, Univ. of Lethbridge (Canada)
Bradley G. Gom, Univ. of Lethbridge (Canada)
Ian S. Schofield, Univ. of Lethbridge (Canada)
Gregory J. Tompkins, Univ. of Lethbridge (Canada)
Ian M. Chapman, Univ. of Lethbridge (Canada)


Published in SPIE Proceedings Vol. 4820:
Infrared Technology and Applications XXVIII
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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