Measuring and testing – Vibration – By mechanical waves
Patent
1982-10-25
1984-06-05
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73626, 73642, 310334, 310365, G01N 2900
Patent
active
044520840
ABSTRACT:
An ultrasonic transmitting and/or receiving transducer is disclosed which includes a piezoelectric body with electrodes at opposite faces thereof. At least one of the electrodes is in the form of an elongated strip conductor such that the transducer also functions as a lossy delay line. The beam pattern of the transducer is dependent upon the delay of the delay line. A high permeability member such as a ferrite body is located adjacent the elongated strip conductor to increase the distributed inductance of the delay line and, consequently, the delay thereof. The permeability of the ferrite body is controlled by use of a drive coil adjacent thereto. By time varying the drive current to the coil, the acoustic beam pattern is time varied. By using a spiral shaped elongated strip conductor on a cylindrical shaped piezoelectric body, a focusing transducer is provided.
REFERENCES:
patent: 1957063 (1934-05-01), Hansell
patent: 2913602 (1959-11-01), Joy
patent: 2963597 (1960-12-01), Gerber
patent: 3059130 (1962-10-01), Robins
patent: 3114849 (1963-12-01), Poschenrieder
patent: 3166731 (1965-01-01), Joy
patent: 4242913 (1981-01-01), Mezrich et al.
Beckman Victor R.
Kreitman Stephen A.
SRI - International
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