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Proceedings Paper

Multistage position-stabilized vibration isolation system for neutron interferometry
Author(s): Muhammad Arif; Dennis Eugene Brown; Geoffrey L. Greene; R. Clothier; K. Littrell
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Paper Abstract

A two stage, position stabilized vibration isolation system has been constructed and is now in operation at the Cold Neutron Research Facility of the National Institute of Standards and Technology, Gaithersburg, MD. The system employs pneumatic isolators with a multiple input/multiple output pneumatic servo system based upon pulse width modulation control loops. The first stage consists of a 40,000 kg reinforced concrete table supported by pneumatic isolators. A large environmentally isolated laboratory enclosure rests on the concrete table. The second stage consists of a 3000 kg granite optical table located within the enclosure and supported by another set of pneumatic isolators. The position of the two stages is monitored by proximity sensors and inclinometers with 12 degrees of freedom. The system controls 12 independent pneumatic airsprings. The signals from these sensors are fed into a personal computer based control system. The control system has maintained the position of the two stages to better than 1 micrometers in translation and 5 (mu) rad in orientation for a period of a few months. A description of the system and its characteristics is given.

Paper Details

Date Published: 4 October 1994
PDF: 7 pages
Proc. SPIE 2264, Vibration Monitoring and Control, (4 October 1994);
Show Author Affiliations
Muhammad Arif, National Institute of Standards and Technology (United States)
Dennis Eugene Brown, National Institute of Standards and Technology (United States)
Geoffrey L. Greene, National Institute of Standards and Technology (United States)
R. Clothier, Bethany College (United States)
K. Littrell, Univ. of Missouri/Columbia (United States)

Published in SPIE Proceedings Vol. 2264:
Vibration Monitoring and Control
Colin G. Gordon, Editor(s)

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