Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-02-22
1979-04-03
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 05R, G01R 3308
Patent
active
041479742
ABSTRACT:
An optically pumped magnetic resonance gyroscope wherein the direction of the magnetic fields intersecting the absorption cells of two interconnected spin generators may be oriented in the same or opposite directions, but are of unequal magnitude. The output from each spin generator comprises signals having frequencies characteristic of the two isotopes contained in the cell of each spin generator. These signals are applied to filter circuits each of which passes a desired frequency. Two signals are multiplied in frequency. A pair of phase difference sensors measure differences in phase between pairs of filter outputs, and controls the spin generators in such a manner as to return a first function of the phase differences to null. The output signal from the instrument, derived from a second function of the phase differences, represents the angular rotation of the gyro about a predetermined axis.
REFERENCES:
patent: 3103621 (1963-09-01), Fraser
patent: 3158803 (1964-11-01), Bell
patent: 3214683 (1965-10-01), Andres
patent: 3778700 (1973-12-01), Bagley
patent: 3863144 (1975-01-01), Simpson
Kennedy Thomas W.
The Singer Company
Tokar M.
Wright Laurence A.
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