Flowmeter system with synchronous clock for generation of timing signals
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United States of America Patent
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Aug 24, 1982
Grant Date -
N/A
app pub date -
Jan 13, 1981
filing date -
Jan 13, 1981
priority date (Note) -
Expired
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Abstract
A flowmeter system for measuring the flow and changes in the velocity of sound due to changes in composition or temperature of a fluid medium in a flow tube including transducers which generate acoustic compression waves in the fluid medium, phase lock loop transmitter/receiver circuitry including device for measuring the difference in phase of the acoustic compression waves transmitted upstream relative to that received and for measuring the phase difference of the acoustic compression waves transmitted downstream relative to that received and producing a sum signal dependent upon the sum of the two measured phase differences, device for producing a difference signal proportional to the difference of the two measured phase differences which provides an output signal representing the direction and magnitude of the measured flow device for automatically adjusting the frequency of the acoustic compression waves so that their wave lengths remains constant, said means for automatically adjusting the frequency including a voltage controlled oscillator whose output frequency changes with a change in the sum signal, and synchronous clock device coupled to the output of the voltage controlled oscillator for providing a time base for the entire circuit which is synchronized with the output frequency of the voltage controlled ocsillator.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- MARQUETTE GAS ANALYSIS CORP.;PERKINELMER INSTRUMENTS LLC
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Loveland, Robert S | West Covina, CA | 6 | 51 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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