Ultrasonic Technology Introduction Ultrasonic technology can be utilized in gas flow meter and gas concentration sensor. This paper presents the principle and advantages of Ultrasonic measurement to detect gas flow and oxygen concentration and overview of Cubic ultrasonic oxygen sensors. Working principle for flow measurement Ultrasonic oxygen flow meter is to measure the sound waves in the flow of media in the relationship between the time and the flow as the principle. Generally speaking, the actual propagation velocity of the acoustic wave in the fluid is composed of the component of the propagation velocity of the sound waves in the stationary state of the medium and the axial average velocity of the fluid in the direction of acoustic wave propagation weight. As shown in below Figure, the relationship between the downstream and counter current propagation times and the quantities is: Working principle for concentration measurement Ultrasonic concentration detection theory: when the binary gas mixture composition has molecular weight difference, sound travel speed varies from different gas composition. Advantages ◆No need calibration in application ◆Long lifetime, around 5-10 years ◆Compact size, easy to install ◆Low cost, high accuracy, good stability ◆Gas concentration and flow can be measured together Wuhan Cubic Optoelectronics Co., Lt