Apparatus and method for characterizing movement of a mass withi

Details Apparatus and method for characterizing movement of a mass withi Apparatus and method for characterizing movement of a mass withi

1997-04-02

1999-06-22

Ballato, Josie

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

34087037, 324658, G01R 2726

Patent

active

059146109

ABSTRACT:
Apparatus and methods for resolving presence, orientation and activity of a person within a defined space utilizes at least one electrode proximate to the space to be observed. An AC signal is applied to the electrode, and the current measured from that electrode and also to any other electrodes included in the system, and which are effectively connected to the ground return of the AC-coupled electrode. A person (or object) to be sensed intercepts a part of the electric field extending beween the AC-coupled "sending" electrode and the other "receiving" electrodes, the amount of the field intercepted depending on the size and orientation of the sensed person, whether or not the person provides a grounding path, and the geometry of the distributed electrodes. Given the nonlinear spatial dependence of the field, multiple electrodes can reliably distinguish among a set of expected cases. The invention can be configured to detect not only static positions and orientations, but also motion through a defined space. This is accomplished by taking sequential measurements at different times and utilizing the time variation in signal magnitudes as well as the absolute magnitudes themselves.

REFERENCES:
patent: 3781672 (1973-12-01), Maltby
patent: 3843924 (1974-10-01), Wahlgreen
patent: 5130672 (1992-07-01), Watkiss
patent: 5525843 (1996-06-01), Howing

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