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1. CN1265216 - Active control of acoustic output in gradient coils

Office China
Application Number 97198289.9
Application Date 26.09.1997
Publication Number 1265216
Publication Date 30.08.2000
Grant Number 1131505
Grant Date 17.12.2003
Publication Kind C
IPC
G01R 33/385
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
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 Peter Mansfield
彼得曼斯菲尔德
Inventors Peter Mansfield
彼得·曼斯菲尔德
Agents wang maohua
中国国际贸易促进委员会专利商标事务所
Priority Data 9620138.9 27.09.1996 GB
Title
(EN) Active control of acoustic output in gradient coils
(ZH) 线圈系统主动声音屏蔽装置以及主动声控磁线圈系统
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.

(ZH)

提供一种声控磁线圈系统,其中,合适的非磁传感器嵌在声学材料块中,线圈也嵌在其中,传感器被激励以抵消线圈在激励时所产生的振动噪声。