| 摘要 |
PCT No. PCT/GB92/01728 Sec. 371 Date Nov. 8, 1993 Sec. 102(e) Date Nov. 8, 1993 PCT Filed Sep. 16, 1992 PCT Pub. No. WO93/06440 PCT Pub. Date Apr. 1, 1993.A fluid measurement system includes two transducers which are located in a duct to provide a measuring path through a measuring tube. The transducers are switchable to allow each to be used for both transmission and reception and the speed of fluid passing through the measuring tube will be depedent on the difference in time periods for a signal from the transducers passing with or against the fluid flow. A calibration mechanism employing an auxiliary transducer with its own ultrasonic paths allows accurate measurment of speed of sound values to be determined to the particular system parameters including transducer delay.
|
