Device for detecting object

Details Device for detecting object Device for detecting object

1989-05-09

1990-01-02

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specific condition

340564, G08B 1326

Patent

active

048916277

ABSTRACT:
A device for detecting an object includes apparatus for converting a variation of a floating capacity between a sensor consisting of an electrode plate and an object to be detected into a variation of a frequency signal and apparatus for detecting the state of approach of the object in accordance with the attenuation of the frequency signal.

REFERENCES:
patent: 2421771 (1947-06-01), Browning
patent: 4295132 (1981-10-01), Burney et al.
patent: 4300116 (1981-11-01), Stahouee
patent: 4316180 (1982-02-01), LeVert
patent: 4345167 (1982-08-01), Caluih
patent: 4366473 (1982-12-01), Inoue et al.

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