Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1982-08-02
1984-10-16
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328134, G01R 2314
Patent
active
044777736
ABSTRACT:
A frequency measuring apparatus is provided wherein an input signal is separated into a pair of channels. A phase modulating circuit modulates the phase of the portion of the input signal fed to a first one of the pair of channels as a function of time in response to a phase modulating signal to provide a corresponding phase modulated signal. A power divider in the second one of the pair of channels separates the portion of the input signal fed to the second one of the pair of channels into a plurality of signals having phase delays imparted thereto which are proportional to the frequency of the input signal. The phase modulated signal is combined with each one of the phase delayed signals to produce a plurality of modulated signals, each one thereof having, as the envelope thereof, a signal having a frequency related to the frequency of the phase modulating signal and a phase angle relative to the phase of the phase modulating signal which is related to the frequency of the input signal. The components of the envelopes of the modulated signals are detected and are fed, along with the phase modulating signal, to a phase detecting means for determining the phase differences between the envelope components relative to the phase of the phase modulating signal and, from such phase differences, the frequency of the input signal.
REFERENCES:
patent: 3012200 (1961-12-01), Hurvitz
patent: 4144491 (1979-03-01), Hutcheon
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
Tokar Michael J.
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