Non intrusive and dynamic method for measuring a distance or...

G - Physics – 01 – B

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G01B 7/02 (2006.01) G01B 7/14 (2006.01) G01H 11/00 (2006.01)

Patent

CA 2439349

A non intrusive method and system for the dynamic measurement of a distance, or the variations over time thereof, constituting the thickness, or the variations thereof, of a thin compressible dielectric material located between one or several other closely spaced solid dielectric layers of constant thickness and a conductive or semi-conductive surface. This is achieved by positioning a capacitive sensor on the external layer of the dielectric material, the sensor being composed of two parallel plates electrically insulated from one another, feeding the first plate with a high frequency signal, measuring the voltage and current value over time generated by the high frequency signal between the plate of the sensor which is closest to the surface of the outer layer of dielectric material, and deducting the above distance or variations thereof.

L'invention concerne un procédé non invasif et un système permettant d'effectuer une mesure dynamique d'une distance ou de ses variations au fil du temps, cette distance constituant l'épaisseur, ou ses variations, d'un matériau diélectrique compressible situé entre une ou plusieurs autres couches diélectriques solides étroitement espacées d'épaisseur constante et une surface conductrice ou semi-conductrice. Le procédé consiste à place un capteur capacitif sur la couche extérieure du matériau diélectrique, ledit capteur étant constitué de deux plaques parallèles électriquement isolées l'une de l'autre, à soumettre la première plaque à un signal haute fréquence, à mesurer les valeurs de tension et de courant produites au fil du temps par le signal haute fréquence entre la plaque du capteur la plus proche de la surface de la couche extérieure du matériau diélectrique et la surface conductrice ou semi-conductrice, puis à en déduire la distance susmentionnée ou ses variations.

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