Method for alerting physical approach
First Claim
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1. A device for detecting presence or motion of interest in an area, comprising:
- an E-field sensing antenna for sensing AC components of an E-field within the area;
a high input impedance amplifier having an input coupled to the E-field sensing antenna and producing output signals related to the sensed AC components of the E-field sensed;
an AC signal source adapted to generate an AC signal in the area, and wherein the AC components being sensed includes the E-field of the AC signal from the AC signal source; and
a means for detecting sensed AC signals of interest and providing an response signal response indicative thereof, said response signal indicating presence or motion of interest in the area.
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Abstract
A method and apparatus is described to detect the physical approach. The method is useful for passively detecting the presence of people, pets, or robots in proximity to a sensor. It is portable, and functions while being carried or placed inside objects.
52 Citations
20 Claims
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1. A device for detecting presence or motion of interest in an area, comprising:
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an E-field sensing antenna for sensing AC components of an E-field within the area; a high input impedance amplifier having an input coupled to the E-field sensing antenna and producing output signals related to the sensed AC components of the E-field sensed; an AC signal source adapted to generate an AC signal in the area, and wherein the AC components being sensed includes the E-field of the AC signal from the AC signal source; and a means for detecting sensed AC signals of interest and providing an response signal response indicative thereof, said response signal indicating presence or motion of interest in the area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification