Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-09-17
1976-06-15
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57Q, G01R 2922
Patent
active
039639827
ABSTRACT:
Apparatus is provided for measuring the resonant frequency and the coefficient of coupling of a plurality of coupled piezoelectric resonators. A plurality of electrode terminals are provided in the apparatus for connection to respective resonator electrodes, and a common terminal is provided for connection to common electrodes of the resonators. First switching means are connected to a signal source for applying the signal selectively to one of the electrode terminals. A parallel resonant circuit is coupled between each of the electrode terminals and the common terminal respectively to provide a relatively high impedance at the resonant frequency of the adjacent resonators. Second switching means are connected in parallel with the parallel resonant circuits for selectively short-circuiting the resonant circuits. In operation, the resonant frequency of each of the resonators is indicated by applying a signal of the proper frequency to the apparatus with the resonant circuits not short-circuited, and measuring resonant frequencies in the apparatus. Coupling between adjacent resonators is indicated by applying a range of signal frequencies to the apparatus with selected resonant circuits short-circuited, and measuring resonant frequencies in the apparatus.
REFERENCES:
patent: 2594091 (1952-04-01), Summerhayes
patent: 2929988 (1960-03-01), Engleman
patent: 2939077 (1960-05-01), Branin
patent: 2976604 (1961-03-01), Kosowsky
patent: 2991436 (1961-07-01), Banton
patent: 3049666 (1962-08-01), Anderson
patent: 3593125 (1971-07-01), Wilhelm et al.
patent: 3832631 (1974-08-01), Koga et al.
patent: 3840804 (1974-10-01), Sauerland
General Electric Company
Strecker Gerard R.
Williams James J.
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