Capacitive sensor and electronic circuit for non-contact distanc

Details Capacitive sensor and electronic circuit for non-contact distanc Capacitive sensor and electronic circuit for non-contact distanc

1988-08-25

1990-05-08

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324690, G01R 106, G01R 1067

Patent

active

049241729

ABSTRACT:
A novel thin, three-terminal capacitive transducer which is positioned in a clearance gap to be measured is presented. This transducer comprises an insulated assembly having three parallel conductive planes with the first and second plane each containing a single electrode and the third plane containing a pair of spaced electrodes. Preferably, each electrode is composed of a thin layer of copper mounted on an insulated substrate such as an epoxy-glass composite. An air space is provided between each of the pair of electrodes in the third plane and the single electrode in the second plane. Another important feature of the present invention is a novel electronic circuit for use in conjunction with the novel three terminal capacitive transducer. This circuit provides a means of "synthetic resonance" whereby a small capacitance (such as generated by the three-terminal capacitive sensor of this invention) functions as if it were at or near series resonance with a synthesized large inductance. This is achieved by using a synthesized network (which is a variation of a known twin-tee circuit) in the feedback path of a high gain amplifier, thereby inverting the normal rejection notch into a resonance-like peak at a frequency determined mathematically.

REFERENCES:
patent: 3896697 (1975-07-01), Iannone
patent: 4160204 (1979-07-01), Holmgren et al.
patent: 4203087 (1980-05-01), Kovac et al.
patent: 4339709 (1982-07-01), Brihier
patent: 4439725 (1984-03-01), Ogasawara
patent: 4771247 (1989-09-01), Jacomb-Hood
"A Capacitance Humidity-Sensing Transducer", by Thoma et al., IEEE Trans. on Comp., Hyb., & Mem. Tech., vol. CHMT-2 #3, 9/79, pp. 321-323.

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