Apparatus and method for detecting movement of an object

Details Apparatus and method for detecting movement of an object Apparatus and method for detecting movement of an object

1989-04-10

1991-05-28

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

307308, 328 5, G08B 1326

Patent

active

050198041

ABSTRACT:
A sensor electrode is capacitively coupled to the environment. Electric charges carried by surrounding objects induce corresponding electric charges on the sensor electrode. A high input impedance circuit senses change in charge on the electrode and provides a first varying signal indicative of that change. A second circuit compares the first signal against a threshold level and provides a second signal indicative of the movement. A pair of sensors may be included to cancel out extraneous environmental chasrges. Difference between charges on each sensor electrode of the pair is compared in a circuit which provides signal indicative of the difference. The varying signal is compared against a threshold to provide a signal indicative of the movement.

REFERENCES:
patent: 3898472 (1975-08-01), Long
patent: 3973208 (1976-08-01), Diamond
patent: 4295132 (1981-10-01), Burney et al.
patent: 4316180 (1982-02-01), LeVert
patent: 4345167 (1982-08-01), Calvin
patent: 4366473 (1982-12-01), Inoue et al.

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