| 摘要 |
<p>Disclosed is a method for measuring a physical value of fluid flow in a pipe using a time difference (Δt) measured by a propagation time difference method, a first propagation speed of the ultrasonic wave in a fluid when the fluid stops, a refraction angle in the fluid of the ultrasonic wave generated in a pair of ultrasonic wave converters, and a transmission distance of the ultrasonic wave calculated by the refraction angle (θ_f) and a size of a pipe.</p> |
