초록 ▼

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 incomin

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.

대표청구항 ▼

A method of measuring the ratio of gasses in a binary gas mixture comprising the steps of; transmitting a first sound wave from an initial transmission point through the gas mixture, detecting the arrival of said first sound wave at a receiving point a preselected distance from said initial transmis

A method of measuring the ratio of gasses in a binary gas mixture comprising the steps of; transmitting a first sound wave from an initial transmission point through the gas mixture, detecting the arrival of said first sound wave at a receiving point a preselected distance from said initial transmission point, then, after a given delay, transmitting an echo wave from said receiving point in the opposite direction, through the gas mixture, back to said initial transmission point, said echo wave being of the same frequency and wave length as said first sound wave and superimposed thereon, receiving said echo wave at said initial transmission point, then measuring the travel time from the initial transmission to the time of reception of said echo wave to provide a measure of the relative proportions of the gases in said mixture, and providing a display indicative of the relative proportions of said gasses.