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Ultrasonic measurement system using a perturbing field, multiple sense beams and receivers

  • US 4,431,008 A
  • Filed: 06/24/1982
  • Issued: 02/14/1984
  • Est. Priority Date: 06/24/1982
  • Status: Expired due to Fees
First Claim
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1. A system for ultrasonic inspection of a living substance includingperturbing means to perturb an interior volume of said substance by ultrasonic waves, said perturbing means including a first transducer, a first oscillator connected to said first transducer, and means to cause the waves produced by said first transducer to produce a heated focal region;

  • means to produce a collimated ultrasonic sense beam directed through said focal region and means to produce at least one reference beam directed near said focal region but not through it, said sense beam means and said reference beam means including an ultrasonic transmitting transducer to produce its respective collimated beam, a reference oscillator which is a source of continuous oscillations of ultrasonic frequency, and gating means connected between said source and said transducer to produce bursts of oscillations which are fed to its said transducer, thus producing discrete trains of ultrasonic waves;

    at least two ultrasonic receiving transducers each positioned to receive respectively said sensing beam and said reference beam and at least two phase comparison circuits with one phase comparison circuit being connected to each of said receiving transducers and to the reference oscillator for its respective transmitting transducer to respond to time of flight changes in the respective beams caused by transmission of the sense beam through said focal region with said heating compared to transmission of the sense beam through said focal region without said heating; and

    means to compare time of flight changes in the sense beam and said reference beam in order to lessen the adverse effects of tissue movement of the living substance during the measurement.

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