Human body detection system

Details Human body detection system Human body detection system

1993-03-18

1994-11-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250342, 340567, G01V 904

Patent

active

053692691

ABSTRACT:
In order to detect a position where a human body may exist with the aid of a single infrared detector, a human body detecting system comprises a condenser for the provision of a plurality of effective detection regions each having different areas and provided within partial detection regions. When the human body moves across one of the effective detection regions, the infrared detector detects the infrared rays radiated from the human body to produce signals. Accordingly, the thus output signals present different frequencies depending on the effective detection regions, whereby the differences in the fluctuation times of the output signals and in the frequencies are discriminated by a decision apparatus to consequently detect which partial detection region includes the human body.

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