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Proceedings Paper

Facility for interferometric measurement of linear displacement in actuators and calibration of sensors at cryogenic temperatures between 4.2 K and 77 K
Author(s): Robert G. Chave; Toby A. J. Wiseman; Martin B. Barmatz; Inseob Hahn
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Paper Abstract

Recent advances in material science have lead to the development of new, very low temperature actuators of Terbium and Dysoprosium with hitherto unavailable stroke, energy efficiency and force. The test instrument described here was developed to investigate the performance characteristics of these new materials and the devices based upon them. The instrument, referred to as a cryogenic dilatometer, is designed for measuring linear displacements, at accuracies of 0.1 micron, in a material, actuator or sensor operating at low temperatures including that of liquid helium. The instrument, just completed, maintains the sample at a known temperature between 4.2 and 77 K, subjects the actuator material to a known and variable magnetic field of up to 1,500 gauss, places a specific and variable preload of 750 N maximum against the actuator or sample, and measures the resulting actuator displacement. A secondary capability is to provide a reference measurement for calibrating commercial capacitance, eddy current, linear variable differential transformers and other displacement gages at low temperatures. The primary linear displacement measurement tool is a fringe counting interferometer. A liquid helium cooled probe provides the sample test environment.

Paper Details

Date Published: 20 November 1996
PDF: 8 pages
Proc. SPIE 2865, Actuator Technology and Applications, (20 November 1996); doi: 10.1117/12.259028
Show Author Affiliations
Robert G. Chave, Jet Propulsion Lab. (United States)
Toby A. J. Wiseman, Jet Propulsion Lab. (United States)
Martin B. Barmatz, Jet Propulsion Lab. (United States)
Inseob Hahn, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 2865:
Actuator Technology and Applications
Alson E. Hatheway, Editor(s)

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