Method and apparatus for measuring the resonant frequency of a h

Details Method and apparatus for measuring the resonant frequency of a h Method and apparatus for measuring the resonant frequency of a h

1985-06-03

1986-12-16

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 57Q, 324 57PS, G01R 2300

Patent

active

046299777

ABSTRACT:
A resonator is initially charged by applying a drive signal offset from the expected resonant frequency of the resonator for a selected period of time. After the drive signal is removed from the resonator a period counter is used to count the period of the output signal of the resonator as it rings down. For low-Q resonators an amplifier is included to amplify the resonator output signal before being applied to the period counter to increase the number of cycles of that signal which are within the dynamic range of the period counter.

REFERENCES:
patent: 4211970 (1980-07-01), Fitzky
patent: 4447782 (1984-05-01), Rutkoski

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