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1. WO1998013821 - ACTIVE CONTROL OF ACOUSTIC OUTPUT IN GRADIENT COILS

Publication Number WO/1998/013821
Publication Date 02.04.1998
International Application No. PCT/GB1997/002635
International Filing Date 26.09.1997
Chapter 2 Demand Filed 21.04.1998
IPC
G01R 33/385 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44-G01R33/6496
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
385using gradient magnetic field coils
G10K 11/178 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
CPC
G01R 33/3854
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44 - G01R33/64
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
385using gradient magnetic field coils
3854means for active and/or passive vibration damping or acoustical noise suppression in gradient magnet coil systems
G10K 11/1785
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
1785Methods, e.g. algorithms; Devices
G10K 11/17879
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
1787General system configurations
17879using both a reference signal and an error signal
G10K 2210/1161
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
2210Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
10Applications
116Medical; Dental
1161NMR or MRI
G10K 2210/1291
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
2210Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
10Applications
129Vibration, e.g. instead of, or in addition to, acoustic noise
1291Anti-Vibration-Control, e.g. reducing vibrations in panels or beams
G10K 2210/3026
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
2210Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
30Means
301Computational
3026Feedback
Applicants
  • MANSFIELD, Peter [GB]/[GB]
Inventors
  • MANSFIELD, Peter
Agents
  • GOODMAN, Christopher
Priority Data
9620138.927.09.1996GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ACTIVE CONTROL OF ACOUSTIC OUTPUT IN GRADIENT COILS
(FR) COMMANDE ACTIVE DE SORTIE ACOUSTIQUE DANS DES BOBINES A GRADIENT
Abstract
(EN)
An acoustically controlled magnetic coil system is provided in which suitable non-magnetic transducers are embedded in a block of acoustic material in which the coil is also embedded, the transducers being energised to oppose the vibratory noise generated by the coil when energised.
(FR)
L'invention se rapporte à un système de bobine magnétique à commande acoustique, dans lequel des émetteurs-récepteurs non magnétiques appropriés sont encastrés dans un bloc constitué d'un matériau acoustique où la bobine est également encastrée, les émetteurs-récepteurs étant mis sous tension de façon à contrer les émissions sonores vibrantes provoquées par la bobine lorsque celle-ci est elle-même mise sous tension.
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