Ultrasonic binary gas measuring device
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United States of America Patent
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May 6, 1997
Grant Date -
N/A
app pub date -
May 25, 1995
filing date -
May 25, 1995
priority date (Note) -
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Abstract
A method and apparatus to continuously measure the ratio of gasses in a binary gas mixture. A binary gas mixture is passed through a chamber in which a single ultrasonic wave travels from one piezoelectric transducer to another on the opposite side of the chamber. Immediately upon sensing an incoming ultrasonic wave, the transducer on opposite side of the chamber converts into a transmitter and transmits a single wave on top of the just received wave. The new wave travels back in the direction of the first transducer where it is received. The time of travel back and forth through the chamber is compared to a reference time, and represents the concentration of a gas in a binary gas mixture. The difference between time of travel in the direction of flow and against the direction of flow represents standard flow rate. A temperature sensor located in the middle of the chamber is used to temperature compensate the result. From the measured times, the temperature, the offset, and stored formulas a microprocessor calculates the gas concentration and/or the standard flow rate for the gas.
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