G - Physics
01
F
349/39
G01F 1/66 (2006.01)
Patent
CA 2020271
ABSTRACT A gain-controlled amplifier (24) in a sonic flow meter accepts an output signal from each transducer of a plurality of pairs of transducers (1a, 1b; 2a, 2b; 3a, 3b; and 4a, 4b) in sequence. A ramp generator (62) generates a time-varying-gain output, which increases between the transmission of a pulse by one transducer and the reception thereof by another. This time-varying-gain signal is one component of the amplifier's gain-control signal, which includes as another component an AGC value fetched from a memory (50) and rendered into analog form by a digital-to-analog converter (42). The value in the memory (50) is the difference between the time-varying-gain value and the value that other circuitry (30, 36) has determined to be necessary by monitoring the amplifier output produced during a previous operation of the same transducer pair. A third component of the gain-control signal is provided by further circuitry (40, 72, 76, 102), which acts to reduce the gain-controlled value if it determines that noise is present. It concludes that noise is present if the receiving transducer produces signal magnitudes that exceed a predetermined threshold before sound is expected from a transmitting transducer.
Ferranti O.r.e. Inc.
Smart & Biggar
LandOfFree
Sonic flow meter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sonic flow meter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sonic flow meter will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1875867