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20 November 1996 Facility for interferometric measurement of linear displacement in actuators and calibration of sensors at cryogenic temperatures between 4.2 K and 77 K
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert G. Chave, Toby A. J. Wiseman, Martin B. Barmatz, and Inseob Hahn "Facility for interferometric measurement of linear displacement in actuators and calibration of sensors at cryogenic temperatures between 4.2 K and 77 K", Proc. SPIE 2865, Actuator Technology and Applications, (20 November 1996); https://doi.org/10.1117/12.259028
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