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Low power signal processing and measurement apparatus

  • US 5,650,571 A
  • Filed: 03/13/1995
  • Issued: 07/22/1997
  • Est. Priority Date: 03/13/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring flow velocity of a fluid or gas medium by measuring a transit time of an ultrasonic transmission signal through the fluid or gas medium both with and against the flow of said fluid or gas medium, the apparatus comprising:

  • a first transmission means for providing a first ultrasonic transmission signal for injection into said fluid or gas medium in the direction of the flow at a predetermined time;

    a first reception means, displaced from said first transmission means, for receiving a first ultrasonic received analog signal from said fluid or gas medium;

    a second transmission means for providing a second ultrasonic transmission signal for injection into said fluid or gas medium in the direction against the flow at a predetermined time;

    a second reception means, displaced from said second transmission means, for receiving a second ultrasonic received analog signal from said fluid or gas medium;

    means, coupled to both said first and second reception means, for correlating said first and second ultrasonic received analog signals with said first and second ultrasonic transmission signals, respectively, such that peak intervals of the correlation of both said first and second ultrasonic received analog signals are extracted;

    an analog-to-digital converter, coupled to said means for correlating, for digitizing said peak intervals; and

    a processor means, coupled to said analog-to-digital converter, for calculating from said digitized peak intervals the transit time of said fluid or gas medium.

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