Digital measurement of impedance ratios

Details Digital measurement of impedance ratios Digital measurement of impedance ratios

1978-02-13

1980-02-05

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2726

Patent

active

041874595

ABSTRACT:
A circuit arrangement for measuring the ratio of first and second capacitances of a capacitance displacement transducer. An alternating signal is developed the amplitude of which is proportional to the values of the first and second capacitances during respective first and second timing periods, the alternating signal being synchronously demodulated in one phase in the first period and in the opposite phase in the second period. The demodulated signal is integrated so that the integrator is charged and discharged during the first and second periods respectively, and the ratio of the discharge time to the charge time is equal to the ratio of the two capacitances. A digitized output is provided by means of a clock pulse generator and counter.

REFERENCES:
patent: 3325727 (1967-06-01), Haas
patent: 3713022 (1973-01-01), McRay
patent: 3947760 (1976-03-01), Noguchi et al.

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