Moisture and density detector (mdd)

G - Physics – 01 – R

Patent

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Details

G01R 27/28 (2006.01) G01N 9/24 (2006.01) G01N 22/04 (2006.01) G01R 27/08 (2006.01) G01R 27/26 (2006.01)

Patent

CA 2475201

A Moisture and Density Detector (MDD) to determine the moisture content and/or density of any dielectric material (130) for various purposes. This device is very useful in detecting the moisture content (MC) of wood and wood-based materials, such as that of lumber in a dry kiln prior to, during and/or following drying. The MDD passes a radio frequency signal (105) between opposed or adjacent capacitance electrodes (110, 120) and measures the signal strength and phase shift of the signal. The addition of phase shift and multiple frequencies improves the accuracy of the results.

Cette invention concerne un détecteur d'humidité et de densité permettant de déterminer à des fins diverses la teneur en eau et/ou la densité d'un quelconque matériau diélectrique. Ce dispositif convient particulièrement bien pour détecter la teneur en eau de bois et de matériaux à base de bois (bois d'oeuvre par exemple) dans un séchoir avant, pendant et après le séchage. Le détecteur d'humidité et de densité émet un signal de radiofréquence entre des électrodes de capacitance opposées ou adjacentes et mesure la force du signal et son déphasage. L'addition du déphasage et de fréquences multiples permet d'améliorer la précision des résultats.

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