Method and apparatus for detecting or measuring the presence of

Details Method and apparatus for detecting or measuring the presence of Method and apparatus for detecting or measuring the presence of

1986-10-21

1989-09-05

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

128639, 128734, 340541, G08B 1322

Patent

active

048642827

ABSTRACT:
A method and apparatus for detecting the presence of an object, such as a biological organism, particularly that of a human. Changes occuring upon occupation of a unoccupied spacial location are sensed and analyzed to produce a display, or otherwise used to control other devices. The apparatus includes an antennae to detect electromagnetic radiation changes caused by an organism coming into contact with the antennae or in a spacial area in proximity of the antennae. The changes detected by the antennae are coupled through a receiver to a bridge network for analysis. The circuitry of the bridge network compares the changes caused by the detected object to a zero reference. An output from the bridge is applied to a process which compares all signals with a vector preset in the process. Amplitude and phase are compared with known characteristics for the presence of a human body. The process or output can then be used to indicate the presence of a human by a display device or to trigger alarm devices or for other purposes.

REFERENCES:
patent: 4300574 (1981-11-01), Briggs
patent: 4459995 (1984-07-01), Conners et al.
patent: 4557271 (1985-12-01), Stoller et al.
patent: 4574810 (1986-03-01), Lerman
patent: 4578634 (1986-03-01), Mee et al.
patent: 4602639 (1986-07-01), Hoogendoorn et al.
patent: 4727330 (1988-02-01), Funk

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