| 摘要 |
The invention relates to ultrasonic fluid flowmeters of the type comprising a pair of transducers acting both as a transmitter and receiver, and circuit means for measuring the time shift between the ultrasonic signals respectively received by the two transducers after propagation in the fluid. According to an important feature, switching means are provided whereby the connection between the two transducers and the receiving and measuring circuits is periodically reversed, which eliminates errors due to variations in the conditions of propagation.
|
