Sensor for detecting the passage of a person or an animal in a f

Details Sensor for detecting the passage of a person or an animal in a f Sensor for detecting the passage of a person or an animal in a f

1991-06-26

1993-03-23

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

49 25, 49 26, 49 31, 340521, 342 28, 342 61, G08B 1318, G08B 2100

Patent

active

051968266

ABSTRACT:
Both a motion detector and a presence detector receive doppler shifted reflected microwave radiation to detect the passage of a person or an animal in a field of view. The motion sensor is adapted to detect the passage of a person or an animal near a doorway and to actuate the doorway in response thereto, to permit the passage of the person or animal thereto. The presence detector detects "swaying motion" of a person or an animal in a field of view much closer to the location of the sensor as its gain is much lower than that of the motion detection channel. In addition the presence detector is activated only in the event the motion sensor is deactivated. The output signals from the motion sensor and presence sensor are gated through an OR gate and to a timer to activate the door opener.

REFERENCES:
patent: 4009476 (1977-02-01), Lutz
patent: 4577437 (1986-03-01), Gionet et al.
patent: 4625199 (1986-11-01), Pantus
patent: 4882567 (1989-11-01), Johnson
patent: 4967083 (1990-10-01), Kornbrekke et al.

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