Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/7070
DC Field | Value | Language |
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dc.contributor.authorall | Cusano, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.authorall | Bobbio, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.authorall | Festa, G.; Università degli Studi di Napoli «Federico II», Dipartimento di Scienze Fisiche, Naples, Italy | en |
dc.contributor.authorall | Petrosino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.authorall | Rombetto, S.; Istituto di Cibernetica «Eduardo Caianiello», Consiglio Nazionale delle Ricerche, Naples, Italy | en |
dc.date.accessioned | 2011-07-15T08:58:39Z | en |
dc.date.available | 2011-07-15T08:58:39Z | en |
dc.date.issued | 2011-07-06 | en |
dc.identifier.uri | http://hdl.handle.net/2122/7070 | en |
dc.description.abstract | We have investigated the mechanical response of a magnetically shielded room that hosts a magnetoencephalography system that is subject to external vibrations. This is a superconducting quantum interference device, which are the most sensitive sensors for magnetic flux variations. When the magnetoencephalography operates with people inside the room, the spectrum of the flux of the magnetic field shows anomalous peaks at several frequencies between 1 Hz and 20 Hz, independent of the experiment that is being run. As the variations in the flux of the magnetic field through the sensors might not only be related to the electrical currents circulating inside the brain, but also to non-damped mechanical oscillations of the room, we installed seismic instrumentation to measure the effective motion inside the room and to compare it to the external motion. For this analysis, we recorded the ambient seismic noise at two very close stations, one inside the magnetically shielded room, the other one outside in the room in which the magnetically shielded room is itself located. Data were collected over four days, including a week-end, to study the response of the magnetically shielded room subjected to different energy levels of external vibrations. The root mean square, Fourier spectra and power spectral density show significant differences between the signal recorded inside and outside the magnetically shielded room, with several anomalous peaks in the frequency band of 1 Hz to 20 Hz. The normalized spectral quantities (horizontal to vertical spectral ratio, and ratio between the internal and external spectra) show large amplification at several frequencies, reaching in some cases one order of magnitude. We concluded that the magnetically shielded room does not dampen the external vibrations, but it instead appears to amplify these across a broad frequency range. | en |
dc.language.iso | English | en |
dc.publisher.name | Istituto Nazionale di Geofisica e Vulcanologia | en |
dc.relation.ispartof | Annals of geophysics | en |
dc.relation.ispartofseries | 3/54 (2011) | en |
dc.subject | Seismic noise | en |
dc.subject | Spectral ratio analyses | en |
dc.subject | Magnetoencephalography | en |
dc.title | Analysis of seismic noise to check the mechanical isolation | en |
dc.title.alternative | MECHANICAL DISTURBANCE ON A MEDICAL DEVICE | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 223-233 | en |
dc.identifier.URL | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4774 | en |
dc.subject.INGV | 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion | en |
dc.identifier.doi | 10.4401/ag-4774 | en |
dc.description.obiettivoSpecifico | 4.1. Metodologie sismologiche per l'ingegneria sismica | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | open | en |
dc.contributor.author | Cusano, P. | en |
dc.contributor.author | Bobbio, A. | en |
dc.contributor.author | Festa, G. | en |
dc.contributor.author | Petrosino, S. | en |
dc.contributor.author | Rombetto, S. | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.department | Università degli Studi di Napoli «Federico II», Dipartimento di Scienze Fisiche, Naples, Italy | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.department | Istituto di Cibernetica «Eduardo Caianiello», Consiglio Nazionale delle Ricerche, Naples, Italy | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia | - |
crisitem.author.dept | Dipartimento di Scienze Fisiche Università di Napoli Federico II | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia | - |
crisitem.author.dept | Istituto di Cibernetica «Eduardo Caianiello», Consiglio Nazionale delle Ricerche, Naples, Italy | - |
crisitem.author.orcid | 0000-0002-6266-6225 | - |
crisitem.author.orcid | 0000-0003-2386-8737 | - |
crisitem.author.orcid | 0000-0002-2588-8160 | - |
crisitem.author.orcid | 0000-0002-5042-0244 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | |
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CusanoEtAl2011AG.pdf | Article | 1.3 MB | Adobe PDF | View/Open |
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