Circuit arrangement for the automatic frequency control of an ul

Details Circuit arrangement for the automatic frequency control of an ul Circuit arrangement for the automatic frequency control of an ul

1978-04-19

1979-11-20

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4110

Patent

active

041752422

ABSTRACT:
Circuit arrangement for inducing oscillations in an ultrasonic transducer approximating its natural resonance frequency, and comprising an oscillator for generation of an excitation AC voltage. A pulse gate circuit is connected to supply pulse wise application of the AC voltage to the transducer. The oscillator frequency is controlled by an auxiliary pulse generator connected to the transducer in parallel with the oscillator. A gate circuit and a phase discriminator are employed to produce favorable excitation for the particular oscillation mode of the transducer. The transducer is made preferably from a piezo electric ceramic. The circuit includes means capable of automatically finding the resonance frequency of the transducer.

REFERENCES:
patent: 3819961 (1974-06-01), Bourgeois et al.
patent: 3842340 (1974-10-01), Brandquist
patent: 3967143 (1976-06-01), Watanabe et al.

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