Measurement instruments and fabrication tools with spatial resolution on the atomic scale require facilities that mitigate the impact of vibration sources in the environment. One approach to protection from vibration in a building’s foundation is to place the instrument on a massive inertia block, supported on pneumatic isolators. This opens the questions of whether or not a massive floating block is susceptible to acoustic forces, and how to mitigate the effects of any such acoustic buffeting. Here this is investigated with quantitative measurements of vibrations and sound pressure, together with finite element modeling. It is shown that a particular concern, even in a facility with multiple acoustic enclosures, is the excitation of the lowest fundamental acoustic modes of the room by infrasound in the low tens of Hz range, and the efficient coupling of the fundamental room modes to a large inertia block centered in the room.
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September 2016
Research Article|
September 09 2016
Acoustic buffeting by infrasound in a low vibration facility
B. P. MacLeod;
B. P. MacLeod
1Department of Chemistry,
University of British Columbia
, Vancouver, British Columbia V6T 1Z1, Canada
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J. E. Hoffman;
J. E. Hoffman
2Department of Physics and Astronomy,
University of British Columbia
, Vancouver, British Columbia V6T 1Z1, Canada
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S. A. Burke;
S. A. Burke
1Department of Chemistry,
University of British Columbia
, Vancouver, British Columbia V6T 1Z1, Canada
2Department of Physics and Astronomy,
University of British Columbia
, Vancouver, British Columbia V6T 1Z1, Canada
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D. A. Bonn
D. A. Bonn
a)
2Department of Physics and Astronomy,
University of British Columbia
, Vancouver, British Columbia V6T 1Z1, Canada
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a)
Author to whom correspondence should be addressed. Electronic mail: bonn@phas.ubc.ca
Rev. Sci. Instrum. 87, 093901 (2016)
Article history
Received:
May 31 2016
Accepted:
August 13 2016
Citation
B. P. MacLeod, J. E. Hoffman, S. A. Burke, D. A. Bonn; Acoustic buffeting by infrasound in a low vibration facility. Rev. Sci. Instrum. 1 September 2016; 87 (9): 093901. https://doi.org/10.1063/1.4962241
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