Method and apparatus for sensing a human body

Details Method and apparatus for sensing a human body Method and apparatus for sensing a human body

1986-06-12

1988-03-22

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250221, 49 25, 340556, G01J 510, G05F 1520

Patent

active

047330813

ABSTRACT:
A method for sensing a human body has the steps of projecting infra-red rays from a projector, receiving infra-red rays reflected from a background and a human body by a photo-sensor, deriving a difference between a reflection amount from the background and that from the human body on the basis of an output from the photo-sensor by the action of first and second integrator circuits, and outputting a human body sense signal from a response circuit when the difference in the reflection amount is held at a predetermined period of time. The first integrator circuit has a relatively small time constant, while the second integrator circuit has a relatively large time constant.

REFERENCES:
patent: 3597755 (1971-08-01), Parkin
patent: 3680047 (1972-07-01), Perlman
patent: 4068222 (1978-01-01), Treviranus
patent: 4207466 (1980-06-01), Drage et al.

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