Peak switch detector for transit time ultrasonic meters
AssigneeDaniel Industries, Inc.
InventorsWilliam R. Freund JR., Klaus Joachim Zanker, Gail Paulin Murray
Life of this patent
Estimating the term…
Abstract
A method is disclosed to identify peak switching errors in an ultrasonic meter and how to correct for them. The method compares transit time measurements from two chords having different lengths to establish an error value. Depending on the magnitude and sign of the error value, any peak switching error can be identified and consequently corrected.
Claims23
A method to detect a peak selection error in a waveform, comprising:
- a) measuring a first average transit time for one or more ultrasonic signals along a first path in a pipeline;
- b) measuring a second average transit time for one or more ultrasonic signals along a second path in said pipeline, said second path being of different length than said first path;
- c) determining whether there exists a peak selection error based on the length of said first path, the length of said second path, said first average transit time, and said second average transit time.
An ultrasonic metering system, comprising:
- a first transducer pair defining a first ultrasonic path having a first path length;
- a second transducer pair defining a second ultrasonic path having a second path length;
- one or more processors associated with said first and second transducer pairs, said one or more processors suitable to determine a first average transit time measurement for ultrasonic signals across said first ultrasonic path and a second average transit time measurement for ultrasonic signals across said second ultrasonic path, wherein said processor is programmed to identify simultaneously measurement errors in said first and second transit time measurements.
A method to determine transit time measurement errors in an ultrasonic meter, comprising:
- a) measuring a first average transit time for one or more ultrasonic signals along a first path in a pipeline;
- b) measuring a second average transit time for one or more ultrasonic signals along a second path in said pipeline, said second path being of different length than said first path;
- c) a step for determining transit time measurement errors in an ultrasonic meter.
The method of claim 21, further comprising:
- d) a step for correcting said measurement errors.
An ultrasonic meter comprising:
- a first transducer pair to generate and receive a first set of ultrasonic signals;
- a second transducer pair to generate and receive a second set of ultrasonic signals;
- means for measuring transit times for said first set of ultrasonic signals and said second set of ultrasonic signals;
- means for determining transit time measurement errors in said measured transit times for said first set of ultrasonic signals and said second set of ultrasonic signals.
Dependencies are inferred from the claim text.