Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-04-23
1976-03-23
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
73 88R, 73362AR, 324 40, G01R 3312
Patent
active
039463079
ABSTRACT:
A measuring apparatus uses an impedance element whose impedance varies with the physical properties of an object consisting of magnetic or electric conductive, heat-responsive or deformable substance, under the condition where the impedance element is energized by a D.C. or A.C. voltage source of a predetermined level. Connected in parallel or series with the impedance element is a negative impedance network, with its input impedance set at a negative value, which comprises an amplifier and positive and negative feedback impedance networks each connected between the input and output terminals of the amplifier. At least either of the positive and negative feedback impedance networks is constituted by a low, high or band pass filter for eliminating an external noise component, whereby the measuring apparatus enables to detect the physical properties of the object with as high a sensitivity and accuracy as possible.
REFERENCES:
patent: 3461400 (1969-08-01), Koda
patent: 3732443 (1973-05-01), Lovrenich
Ando Seigo
Mori Toshiro
Corcoran Robert J.
Nippon Kokan Kabushiki Kaisha
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