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Proceedings Paper

Automation, operation, and data analysis in the cryogenic, high accuracy, refraction measuring system (CHARMS)
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Paper Abstract

The Cryogenic High Accuracy Refraction Measuring System (CHARMS) at NASA's Goddard Space Flight Center has been enhanced in a number of ways in the last year to allow the system to accurately collect refracted beam deviation readings automatically over a range of temperatures from 15 K to well beyond room temperature with high sampling density in both wavelength and temperature. The engineering details which make this possible are presented. The methods by which the most accurate angular measurements are made and the corresponding data reduction methods used to reduce thousands of observed angles to a handful of refractive index values are also discussed.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5904, Cryogenic Optical Systems and Instruments XI, 59040P (18 August 2005); doi: 10.1117/12.619302
Show Author Affiliations
Bradley J. Frey, NASA Goddard Space Flight Ctr. (United States)
Douglas B. Leviton, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 5904:
Cryogenic Optical Systems and Instruments XI
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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