Measuring device and a method for measuring the thickness of...

G - Physics – 01 – B

Patent

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G01B 7/06 (2006.01) G01B 13/06 (2006.01)

Patent

CA 2567778

The present invention relates to a measuring device (1) and a method for measuring the thickness of at least one layer (2) of a moving strip. The measuring device (1) comprises a transmitter body (4), which is axially movable within a transmitter housing (3) and has a sensor head (5), projecting from the transmitter housing (3) and designed to rest against the layer via a gas cushion (2), and an upper portion (6), extending into a chamber (7) delimited within the transmitter housing (3). The transmitter housing (3) is provided with at least one port (9) for the supply of gas, which, in part, forms the said gas cushion and, in part, flows into the chamber (7). The measuring device is characterized in that the transmitter housing (3) is provided with a restrictor (10) for evacuating gas from the chamber (7). The method comprises the step of measuring the thickness of the layer (2) by means of a measuring device (1), the restrictor (10) being adjusted in such a way that the gas cushion exerts a pressure against the layer (2) equivalent to a weight of 0-65 g/cm2.

L'invention concerne un dispositif de mesure (1) et un procédé de mesure de l'épaisseur d'au moins une couche (2) d'une bande mobile. Le dispositif de mesure (1) de l'invention comprend un corps émetteur (4) monté mobile dans le sens axial à l'intérieur d'un logement (3) qui possède une tête de détection (5) faisant saillie du logement (3) de l'émetteur et conçue pour reposer contre la couche par l'intermédiaire d'un coussin gazeux (2), ainsi qu'une partie supérieure (6) qui s'étend dans une chambre (7) délimitée à l'intérieur du logement (3) de l'émetteur. Ledit logement (3) est muni d'au moins un port (9) d'alimentation de gaz, ledit gaz formant en partie le coussin gazeux et coulant en partie dans la chambre (7). Ledit dispositif de mesure est caractérisé en ce que le logement (3) de l'émetteur est pourvu d'un organe de limitation (10) conçu pour évacuer le gaz de la chambre (7). Le procédé de l'invention comprend une étape consistant à mesurer l'épaisseur de la couche (2) au moyen dudit dispositif de mesure (1), l'organe de limitation (10) étant ajusté de façon que le coussin gazeux exerce une pression contre la couche (2) équivalente à un poids de 0 à 65 g/cm?2¿.

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