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Ultrasound speed measurement of temperature and pressure

  • US 20030196476A1
  • Filed: 05/12/2003
  • Published: 10/23/2003
  • Est. Priority Date: 08/13/1998
  • Status: Active Grant
First Claim
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1. A process for calculating an automatically calibrated gas velocity vector in external pressure-temperature, the process comprising:

  • providing first and second transmitters adapted to transmit ultrasonic pulses, wherein the first transmitter is in an open configuration and the second transmitter is in a first ventilated tube, such that the second transmitter is positioned along a first axis;

    providing third and fourth transmitters adapted to transmit ultrasonic pulses, wherein the third transmitter is in an open configuration and the fourth transmitter is in a second ventilated tube, such that the fourth transmitter is positioned along a second axis, the second axis perpendicular to the first axis;

    providing a receiver adapted to receive ultrasonic pulses from the transmitters, whereby the first and second transmitters are each positioned a first distance from the receiver, the third and fourth transmitters are each positioned a second distance from the receiver and are each positioned at a 90 degree angle from the first and second transmitters;

    transmitting a first ultrasonic pulse from the first transmitter to the receiver;

    calculating a first transit time for the first pulse to reach the receiver;

    transmitting a second ultrasonic pulse from the second transmitter to the receiver;

    calculating a second transit time for the second pulse to reach the receiver;

    transmitting a third ultrasonic pulse from the third transmitter to the receiver;

    calculating a third transit time for the third pulse to reach the receiver;

    transmitting a fourth ultrasonic pulse from the fourth transmitter to the receiver;

    calculating a fourth transit time for the fourth pulse to reach the receiver;

    calculating a first transit time differential vector by taking a first difference between the calculated first transit time vector and a first predetermined time transit vector;

    calculating a second transit time differential vector by taking a second difference between the calculated second transit time vector and a second predetermined time transit vector;

    calculating a third transit time differential vector by taking a third difference between the calculated third transit time vector and a third predetermined time transit vector;

    calculating a fourth transit time differential vector by taking a fourth difference between the calculated fourth transit time vector and a fourth predetermined time transit vector;

    calculating a first automatically calibrated gas velocity component vector by taking a first differential difference between the calculated first and second transit time differential vectors;

    calculating a second automatically calibrated gas velocity component vector by taking a second differential difference between the calculated third and fourth transit time differential vectors; and

    determining the automatically calibrated fluid velocity vector by combining the first automatically calibrated gas velocity component vector and the second automatically calibrated fluid velocity component vector.

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