Proximity detector

Details Proximity detector Proximity detector

1980-03-25

1982-04-20

Swann III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

49 31, 307116, 340552, G08B 1324, G08B 1322

Patent

active

043261973

ABSTRACT:
A proximity detector processes voltages induced across the sections of at least one antenna.
The antenna sections are each connected to means (30, 31 and 36 to 39) for rectifying the positive and negative alternations of the alternating signal providing two first and second signals relating, one, to the "peak" value of the voltage induced across the section whose voltage is the highest and, the other, to the mean value of the voltage across the various sections, the first signal supplying an adder controlled by a gate and the second signals are supplied to another input of the adder led by a limiter said means being, in turn, connected to means (21, 22) for analyzing these two signals.
The detector may be used with elevator doors.

REFERENCES:
patent: 2720284 (1955-10-01), Galanty
patent: 3018851 (1962-01-01), Diamond et al.
patent: 3439358 (1969-04-01), Salmons
patent: 3496381 (1970-02-01), Wisnia
patent: 3497995 (1970-03-01), Forsberg
patent: 3794992 (1974-02-01), Gehman
patent: 3953770 (1976-04-01), Hayashi
patent: 4191894 (1980-03-01), Noda et al.
patent: 4208695 (1980-06-01), Noda et al.

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