Techniques for building-scale electrostatic tomography
First Claim
1. A method for mapping dielectric objects in a building scale search region, comprising:
- (a) positioning a a three-dimensional array of electrodes to bound the search region;
(b) driving particular electrodes in a defined sequence with signals having predetermined wavelengths longer than a dimension of the search region;
(c) measuring resulting electric fields using one or more of the electrodes not being driven;
(d) determining, based on fields measured, a three or quasi two-dimensional map of complex permitivities in the search region; and
(e) from the three or quasi two-dimensional map of dielectric permitivities in the search area, creating a three or quasi two-dimensional map of objects in the search region.
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Abstract
Techniques for imaging a search region to detect a dielectric target include placing multiple electrodes outside the search region. At least two electrodes are activated independently of each other. Emitter circuits are connected to corresponding emitter electrodes. Each emitter circuit is configured for using its emitter electrode to produce an electric field with wavelength longer than about one hundred meters. Receiver circuits are connected to corresponding receiver electrodes. Each receiver circuit is configured for using its receiver electrode to measure a property of an electric field produced, at least in part, by an emitter electrode. A processor determines a property of a dielectric target inside the search region based on measurements from the receiver circuits using a subset of the emitter circuits. Among other uses, these techniques allow humans to be detected inside building-size regions, even when hidden by visually opaque blocking material of small dielectric constant.
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Citations
29 Claims
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1. A method for mapping dielectric objects in a building scale search region, comprising:
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(a) positioning a a three-dimensional array of electrodes to bound the search region; (b) driving particular electrodes in a defined sequence with signals having predetermined wavelengths longer than a dimension of the search region; (c) measuring resulting electric fields using one or more of the electrodes not being driven; (d) determining, based on fields measured, a three or quasi two-dimensional map of complex permitivities in the search region; and (e) from the three or quasi two-dimensional map of dielectric permitivities in the search area, creating a three or quasi two-dimensional map of objects in the search region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification