Multistage position-stabilized vibration isolation system for neutron interferometry

Muhammad Arif; Dennis Eugene Brown; Geoffrey L. Greene; R. Clothier; K. Littrell

doi:10.1117/12.188872

4 October 1994 Multistage position-stabilized vibration isolation system for neutron interferometry

Muhammad Arif, Dennis Eugene Brown, Geoffrey L. Greene, R. Clothier, K. Littrell

Proceedings Volume 2264, Vibration Monitoring and Control; (1994) https://doi.org/10.1117/12.188872
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

Citation Download Citation

Muhammad Arif, Dennis Eugene Brown, Geoffrey L. Greene, R. Clothier, and K. Littrell "Multistage position-stabilized vibration isolation system for neutron interferometry", Proc. SPIE 2264, Vibration Monitoring and Control, (4 October 1994); https://doi.org/10.1117/12.188872

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