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Ultrasonic transducer drive circuit

  • US 4,642,581 A
  • Filed: 06/21/1985
  • Issued: 02/10/1987
  • Est. Priority Date: 06/21/1985
  • Status: Expired due to Term
First Claim
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1. An ultrasonic transducer drive circuit comprising:

  • (a) variable power driving means for supplying power to and driving the transducer;

    (b) oscillating means for generating and supplying a drive signal, with a frequency proportional to the phase response of the transducer during operation, to the power driving means, said drive signal fixing the frequency of the power supplied to the transducer substantially at the frequency of the transducer;

    (c) phase detecting and locking means for detecting the phase response of the transducer during operation and inputting a signal proportional thereto to the oscillating means such that the frequency of the oscillating means is shifted proportional to the phase response of the transducer; and

    (d) low pass filter means, coupled between the oscillating means and the phase detecting and locking means, for controlling the rate of the frequency shift of the oscillating means in response to said inputted signal from the phase detecting and locking means.

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