Driving control method of ultrasonic transducer

Details Driving control method of ultrasonic transducer Driving control method of ultrasonic transducer

1986-02-18

1987-01-13

Ciarlante, Anthony V.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

G01N 2900

Patent

active

046354832

ABSTRACT:
In an ultrasonic transducer, frequency characteristics of phase detecting signal and frequency characteristics of transducer drive current are searched, resonant point with current dipping is found on the characteristics, the zero cross point corresponding to the current dipping is decided as the fundamental resonant point, and then PLL follow oscillation is performed. In such constitution, even if there exist many sub resonant frequency points near the fundamental resonant frequency, the PLL follow oscillation can be performed stably.

REFERENCES:
patent: 4114454 (1978-09-01), Ernyei et al.
patent: 4470306 (1984-09-01), Opara
patent: 4577500 (1986-03-01), Mishiro

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