| 摘要 |
PCT No. PCT/EP96/03670 Sec. 371 Date Jul. 7, 1997 Sec. 102(e) Date Jul. 7, 1997 PCT Filed Aug. 21, 1996 PCT Pub. No. WO97/08516 PCT Pub. Date Aug. 21, 1996A volume flow meter for flowing media that works on the transit-time principle includes a conduit measurement section carrying the flowing medium, two ultrasonic transducers arranged on opposite ends of the conduit measurement section sending ultrasonic signals into the flowing medium and/or receiving them from the flowing medium and a control and evaluation circuit. The ultrasonic transducers send ultrasonic signals into the flowing medium via thermally insulating ultrasonic waveguides. The control and evaluation circuit determines the volume flow based on the difference between the total transit time of the ultrasonic signals between the ultrasonic transducers and the sum of the transit times of the ultrasonic signals in the ultrasonic waveguies.
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