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Apparatus for ultrasound detection

  • US 5,042,303 A
  • Filed: 04/16/1990
  • Issued: 08/27/1991
  • Est. Priority Date: 02/21/1986
  • Status: Expired due to Fees
First Claim
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1. An apparatus for ultrasound detection comprising an ultrasound transducer, means for generating an energizing signal for said transducer, means for detecting a signal received by said ultrasound transducer after reflection, said detection means comprising means for determining polarity of said received signal, said polarity determining means comprising means for deriving an auxiliary signal from said received signal, said means for deriving an auxiliary signal comprising rectifying means, said auxiliary signal having the same or twice the base frequency as said received signal, having a shape independent of polarity of said received signal and having an amplitude which at any point of time is a time-independent predetermined function of the amplitude of the received signal at one or more corresponding points of time and said polarity determining means further comprising means for performing a multiplicative operation with said auxiliary signal on said received signal.

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