| 摘要 |
An ultrasonic multi circuit speed measuring method, an ultrasonic multi flow measuring method, and an ultrasonic distance measuring method are provided to accurately measure flow of fluid in a stream tube by the use of a flow rate and a vertical distance between speed measuring circuits. An ultrasonic multi circuit speed measuring method includes the steps of: preparing ultrasonic flow measuring circuits to be apart from each other in a direction perpendicular to an advancing direction of fluid(M101); measuring a flow rate of fluid passing between two ultrasonic oscillators of the ultrasonic flow measuring circuits by calculating a difference between ultrasonic oscillators by measuring a difference between a time from a point of time at which an ultrasonic wave is generated in one ultrasonic oscillator to a point of time at which the ultrasonic wave is received by the other ultrasonic oscillator and a time from a point of time at which the ultrasonic wave is generated in the other ultrasonic oscillator to a point of time at which the ultrasonic wave is received by the one ultrasonic oscillator(M102); measuring a flow rate of fluid passing between an upstream ultrasonic oscillator and a downstream ultrasonic oscillator adjacent to each other(M103); and measuring a flow rate of fluid passing on a line parallel with the two ultrasonic flow measuring circuits(M104). |
