Permeability-modulated carrier referencing

G - Physics – 01 – R

Patent

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Details

G01R 27/00 (2006.01) E01F 11/00 (2006.01) G01P 3/50 (2006.01) G01V 3/10 (2006.01) G08G 1/042 (2006.01)

Patent

CA 2365394

An apparatus and method for measuring the inductance of a wire-loop (20) without direct reference to any particular time-constant or frequency. Low- frequency noise induced into the wire-loop (20) is canceled within the detector circuit (24a, 24b) and crosstalk between a plurality of adjacent wire- loops (20a, 20b) is nullified using passive transformers (22). New wire-loop configurations (20a, 20b) utilize the permeability-modulated carrier referencing to provide repeatable inductive signatures with less intrusive, and non-intrusive installations.

L'invention concerne un appareil et un procédé servant à mesurer l'inductance d'une boucle en fil (20) sans référence directe à une constante de temps ou une fréquence particulière. Le bruit de basse fréquence induit dans la boucle en fil (20) est supprimé à l'intérieur du circuit de détection (24a, 24b), et la diaphonie entre la pluralité de boucles en fil adjacentes (20a, 20b) est annulée à l'aide de transformateurs passifs (22). De nouvelles configurations de boucles en fil (20a, 20b) utilisent la référence de véhicule porteur à perméabilité modulée pour produire des réponses inductrices répétées avec des installations moins intrusives et non intrusives.

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