Capacitance measuring apparatus

Details Capacitance measuring apparatus Capacitance measuring apparatus

1980-08-25

1983-07-12

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

307118, 307355, 324 61R, G01F 2326, G01R 2726

Patent

active

043923780

ABSTRACT:
Capacitance measuring apparatus comprises a variable capacitor VC and a reference capacitor FC. Circuits D, ID, are provided for generating a periodic waveform for application directly to the variable capacitor, and in inverted form to the reference capacitor. Switches means SM are operated by control logic CL to connect the two capacitors in sequence to the input of an integrating amplifier IA, the output of which is applied to a comparator CM to which is also applied a reference level. The output of the comparator controls the control logic. Output of the control logic is converted to an indication of the capacitance of the variable capacitor relative to that of the reference capacitor.

REFERENCES:
patent: 2710541 (1955-06-01), Miller
patent: 2866337 (1958-12-01), Minneman et al.
patent: 2896454 (1959-07-01), Storm et al.
patent: 2899825 (1959-08-01), Adams et al.
patent: 3037385 (1962-06-01), Franzel et al.
patent: 4048525 (1977-09-01), Goldberg et al.
patent: 4214479 (1980-07-01), Maier
patent: 4222267 (1980-09-01), Aldrich
patent: 4235106 (1980-11-01), Maltby et al.
patent: 4245188 (1981-01-01), Rottmar
Publ. "The Operation and Use of a Fast Integrated Circuit Comparator" R. J. Wilder, Fairchild Semiconductors, 1966.

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