J0420106 A Study on Input Method of Ultrasonic Wave for Clamp-on Ultrasonic Gas Flowmeter

We are researching about the clamp-on ultrasonic flowmeter which measures the flow rate of low-pressure gas such as atmospheric pressure. Since acoustic impedances differ greatly by metallic plumbing and internal gas, it is difficult for ultrasonic wave to propagate into the inner gas. We verified input method of ultrasonic wave by perfprming a basic experiment. The basic experiment used two parallel plates. One pair of two ultrasonic transducers were oppositely placed on the outer sides of both plates. It was confirmed that the ultrasonic wave can propagate from one side to another side.