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Characterization of objects by means of ultrasonic waves

  • US 6,250,159 B1
  • Filed: 04/12/1999
  • Issued: 06/26/2001
  • Est. Priority Date: 04/18/1996
  • Status: Expired due to Fees
First Claim
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1. A method for characterizing an object with boundary surfaces by means of ultrasound, comprising the steps ofa) determining a time dependent base impulse from reference signals, b) creating at least one ultrasonic wave in said object, c) detecting echo waves reflected by said boundary surfaces, thus determining a time dependent measuring signal, d) digitalizing said time dependent measuring signal, e) creating a time dependent calculated signal as the sum of temporally shifted and weighed modifications of said base impulse, f) evaluating the sum of the squares of the differences between said measuring signal and said calculated signal, g) repeating evolution steps e) and f) until one optimal calculated signal is found, for which said sum of the squares of the differences between the measuring signal and the calculated signal is minimized, and h) determining a measurement result from the temporal shifts and weightings of this one calculated signal.

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