Dielectric characterization of a substance

G - Physics – 01 – N

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G01N 27/22 (2006.01) C10G 1/04 (2006.01)

Patent

CA 2753559

An aspect of the invention concerns a method of determining the permittivity of a substance using a probe having known dielectric characteristics, a planar end surface normal to the axis of the probe, a signal source, and a signal receiver. In this aspect, the method is carried out by contacting the substance with the planar end surface of said probe to form an interface between the probe and the substance. The method further involves measuring the reflection coefficient of the substance by (1) transmitting a signal through the probe to the interface, (2) receiving the signal reflected from the interface, and (3) comparing said transmitted and reflected signals, and then calculating the permittivity of said substance from the reflection coefficient as so measured. Another aspect of the invention concerns a method of heating a substance, such as bituminous froth, by determining the permittivity of a substance, and providing a radiation source physically and electrically spaced from the substance, with the radiation source having an impedance approximating the complex conjugate impedance of the substance.

Un aspect de l'invention porte sur un procédé de détermination de la permittivité d'une substance à l'aide d'une sonde ayant des caractéristiques diélectriques connues, une surface d'extrémité plane perpendiculaire à l'axe de la sonde, une source de signal et un récepteur de signal. Sous un aspect, le procédé est réalisé par la mise en contact de la substance avec la surface d'extrémité plane de ladite sonde pour former une interface entre la sonde et la substance. Le procédé met en outre en jeu la mesure du coefficient de réflexion de la substance par (1) émission d'un signal à travers la sonde jusqu'à l'interface, (2) réception du signal réfléchi par l'interface, et (3) comparaison desdits signaux émis et réfléchi, puis calcul de la permittivité de ladite substance à partir du coefficient de réflexion ainsi mesuré. Un autre aspect de l'invention concerne un procédé de chauffage d'une substance, telle qu'une mousse bitumineuse, par la détermination de la permittivité d'une substance, et fourniture d'une source de rayonnement physiquement et électriquement espacée de la substance, la source de rayonnement ayant une impédance approximant l'impédance conjuguée complexe de la substance.

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