System for measuring the time for a signal to pass between two spaced points in a fluid
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United States of America Patent
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-
Jan 12, 1993
Grant Date -
N/A
app pub date -
Oct 11, 1990
filing date -
Oct 31, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A measurement system for measuring the time for a signal to pass between two transducers TDR1,2 to allow fluid speed or flow to be determined in a gas meter for example. Each transducer can transmit or receive signals. The system is controlled by a microcontroller 31 and a signal with a phase change acts as a marker which is transmitted from transmitter 21 via matching stage 22,23 from one transducer and is received by the other. On receipt via the matching stage and amplifier 24 it is sampled by capacitor array 25 and detected in detector 29. Amplitude information from array 25 is made available to the microcontroller to compute time of signal travel and hence flow rates.
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