Microwave moisture sensing via waveguide with slot array

G - Physics – 01 – N

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G01N 22/04 (2006.01) F26B 25/22 (2006.01) G01N 22/00 (2006.01)

Patent

CA 2424214

A generator (6) directs microwave signals to a waveguide (1) having a linear array of slots (2), and the signals are received by measuring means (5). The local permittivity or moisture content of material adjacent the waveguide (1), such as a stack of timber, may be determined at each slot (2) via regression analysis. The total permittivity or moisture may be determined by averaging measurements obtained for both transmission directions of the waveguide (1). The apparatus may be used for controlling drying parameters, such as drying time, for the material.

La présente invention concerne un générateur (6) conçu pour diriger des signaux micro-ondes vers un guide d'ondes (1) présentant un réseau linéaire de fentes (2), lesdits signaux étant reçus par un moyen de mesure (5). La permittivité ou la teneur en humidité locales d'une matière adjacente au guide d'ondes (1), telle qu'une pile de bois, peuvent être déterminées au niveau de chaque fente (2) par analyse de régression. La permittivité ou l'humidité totales peuvent être déterminées par le biais de mesures moyennes obtenues pour les deux sens de transmission du guide d'ondes (1). Cet appareil peut être utilisé pour surveiller des paramètres de séchage, tels qu'un temps de séchage, pour ladite matière.

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