| 摘要 |
A flow measuring apparatus has a meter pipe through which the medium being metered flows, at least two ultrasonic transducers being disposed on said pipe for transmitting and receiving a beam running obliquely to the longitudinal axis of the meter pipe. The pipe wall is provided with recesses the beam to pass through from the transmitting transducer into the medium and from the medium to the receiving transducer. Sound-conducting bodies are disposed between the transducers and the medium, the beam passing perpendicularly through the boundary surfaces of said bodies with the medium and said bodies having an acoustic impedance no more than fifteen times the acoustic impedance of the medium.
|
