Measuring and testing – Vibration – By mechanical waves
Patent
1981-08-03
1983-08-16
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73634, 73639, G01N 2904
Patent
active
043984258
ABSTRACT:
The present invention provides an ultrasonic scanning transducer for use in an ultrasonic scanning system that examines an object by directing a series of ultrasonic waves into the object, receiving electrical signals related to the echoes generated by the ultrasonic waves when they strike acoustical interfaces within the object, and displaying the information borne by the electrical signals relating to the nature and location of acoustical interfaces within the object. The ultrasonic scanning transducer includes transducer elements secured to a permanent magnet mounted for rotational movement within the housing of the transducer and a stator assembly for rotating the transducers and magnet continuously in a single direction. The stator assembly receives a periodic signal having a zero average value and creates therefrom a unidirectionally rotating magnetic field which exerts a force on and rotates the permanent magnet.
REFERENCES:
patent: 4092867 (1978-06-01), Matzuk
patent: 4102204 (1978-07-01), Kretz
patent: 4228687 (1980-10-01), Fraser
patent: 4269066 (1981-05-01), Fischer
Ciarlante Anthony V.
Cornelius Andrew J.
Dymax Corporation
Yeager Robert D.
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