Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1985-02-01
1987-02-03
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 83D, 328134, G01R 2500
Patent
active
046410872
ABSTRACT:
The phase change to be measured is multiply measured at artificially incred and decreased values and then averaged to result in greater accuracy. Delayed versions of the reference and input signals are compared in dual channels to the undelayed input signal and the undelayed reference signal, respectively. Resulting time-lengthened and time-shortened phase measurement signals from the dual comparator channels are algebraically combined to provide an analog output signal having an average magnitude accurately proportional to the true phase difference between the undelayed reference and the undelayed input signals. Increased linearity/reproducibility results where relatively high frequency signals (e.g., up to 70 MHz or more) are to be phase compared. An optional voltage clamp on the comparator channel outputs further improves linearity/reproducibility where very small phase differences are being measured.
REFERENCES:
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patent: 3600690 (1971-08-01), White
patent: 3947775 (1976-03-01), Thiebaut
patent: 4184122 (1980-01-01), Clark et al.
patent: 4228370 (1980-10-01), Milburn, Jr.
patent: 4246497 (1981-01-01), Lawson et al.
patent: 4333055 (1982-06-01), Crackel
patent: 4500852 (1985-02-01), Phillips
Clouse, Jr. Clifton E.
Hightower Judson R.
O'Shea Kevin D.
Sartorio Henry P.
The United States of America as represented by the Department of
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