Claims
- 1. A driving control method for an ultrasonic tranducer, comprising the steps of:
- measuring the transducer current and determining the transducer current characteristics;
- determining the vibratory velocity detecting signal of said transducer based upon said transducer current;
- determining the phase characteristic of said vibratory velocity detecting signal with respect to said transducer current;
- locating a zero cross point based on said phase characteristics;
- locating the resonant points of the operation of said transducer based upon said current characteristics;
- determining the fundamental resonant point based upon the relationship of the zero cross point of said phase characteristic with respect to the location and current value of said resonant point; and
- performing a phase lock-loop control oscillation to drive said transducer.
- 2. A driving control method for an ultrasonic tranducer, comprising the steps of:
- measuring the transducer current and determining the transducer current characteristics;
- determining the vibratory velocity detecting signal of said transducer based upon said transducer currence;
- determining the phase characteristic of said vibratory velocity detecting signal with respect to said transducer current;
- locating a zero cross point based on said phase characteristics;
- locating the resonant points of the operation of said transducer based upon said current characteristics;
- determining the fundamental resonant point based upon the relationship of the zero cross point of said phase characteristic with respect to the location and current value of said resonant point; and
- controlling a differential balance so that said phase characteristics of said vibratory velocity detecting signal are made symmetric with respect to said resonant point at the high frequency side and the low frequency side of said fundamental point; and
- performing a phase-lock-loop oscillation operation of said transducer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
58-143593 |
Aug 1983 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 636,629, filed Aug. 1, 1984, now U.S. Pat. No. 4,577,500.
US Referenced Citations (3)
Continuations (1)
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Number |
Date |
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Parent |
636629 |
Aug 1984 |
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