Magneto-radar detector and method

G - Physics – 01 – S

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G01S 13/56 (2006.01) G01S 13/02 (2006.01) G01S 13/04 (2006.01) G01S 13/86 (2006.01)

Patent

CA 2552745

A varying magnetic field excites slight vibrations in an object and a radar sensor detects the vibrations at a harmonic of the excitation frequency. The synergy of the magnetic excitation and radar detection provides increased detection range compared to conventional magnetic metal detectors. The radar rejects background clutter by responding only to reflecting objects that are vibrating at a harmonic excitation field, thereby significantly improving detection reliability. As an exemplary arrangement, an ultra-wideband micropower impulse radar (MIR) is capable of being employed to provide superior materials penetration while providing range information. The magneto- radar may be applied to pre-screening magnetic resonance imaging (MRI) patients, landmine detection and finding hidden treasures.

Un champ magnétique variable excite des vibrations légères dans un objet, un capteur radar détectant les vibrations à une harmonique de la fréquence d'excitation. La synergie entre excitation magnétique et détection radar donne une portée de détection accrue par rapport à celle des détecteurs magnétiques conventionnels de métaux. Pour rejeter le bruit de fond le radar procède en ne réagissant qu'aux objets réfléchissants qui vibrent à un champ d'excitation harmonique, améliorant ainsi de façon notable la fiabilité de détection. Un mode de réalisation concerne un radar MIR (Micropower Impulse Radar) à bande ultra-large capable d'une pénétration supérieure dans les matériaux, tout en donnant une information de distance. Les applications possibles du magnéto-radar sont essentiellement l'examen préalable de patients d'IRM, la détection des mines, et la découverte de trésors cachés.

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