Ultrasound beam alignment servo

Details Ultrasound beam alignment servo Ultrasound beam alignment servo

1996-08-27

1998-12-01

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73620, 73621, 310 905, 600437, 600443, 600453, G01N 2926

Patent

active

058441409

ABSTRACT:
A servo system for directing the operation of an ultrasound beam is described. The system includes a rotor and stator combination that utilizes electromagnetic forces to move the ultrasound beam in translational and rotational directions. In an embodiment of the invention the rotor is a permanent magnet that may be levitated and moved using a plurality of stator coils. Sensors are used to determine the position of the rotor, which information is used by a controller to regulate the stator operation designed to effect movement of the rotor. The sensors are preferably hall effect sensors. The permanent magnet is optionally placed in a fluid having buoyancy characteristics that reduce the electromagnetic force required to levitate the rotor. The rotor may be located off center within a housing so as to conform to asymmetrical viewing requirements, such as in transcranial Doppler ultrasound measurements.

REFERENCES:
patent: 4092867 (1978-06-01), Matzak
patent: 4479388 (1984-10-01), Matzuk
patent: 4857781 (1989-08-01), Shih
patent: 4936307 (1990-06-01), Saito et al.
patent: 5146566 (1992-09-01), Hollis, Jr. et al.
patent: 5313950 (1994-05-01), Ishikawa et al.
patent: 5410232 (1995-04-01), Lee

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