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Apparatus for observing sound field of ultrasonic wave

  • US 4,691,569 A
  • Filed: 11/24/1986
  • Issued: 09/08/1987
  • Est. Priority Date: 09/13/1983
  • Status: Expired due to Fees
First Claim
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1. An apparatus for observing a sound field of an ultrasonic wave, comprising:

  • first means for determining a first parameter value of a medium at each point in a predetermined region using a first ultrasonic wave having a sound field of an arbitrary shape transmitted into the medium, the first parameter value being an equivalent second-order acoustic nonlinearity parameter which characterizes the nonlinear relationship between pressure and density in a medium;

    second means for displaying the output of said first means as one of a two-dimensional and a three-dimensional picture of said predetermined region, thereby displaying the shape of the sound field of said first ultrasonic wave;

    third means for determining a second parameter value of the medium at each point in said predetermined region using a second ultrasonic wave having a sound field uniform over said predetermined region of the ultrasonic wave field transmitted into the medium, the second parameter value being substantially the same as the first parameter value; and

    fourth means for determining a ratio of the first and second parameter values of the medium at each point therein obtained from said first and third means, the output of said fourth means being supplied to said second means and displayed thereby.

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