Clearance measurement system

G - Physics – 01 – B

Patent

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Details

G01B 7/14 (2006.01) F01D 11/14 (2006.01) F01D 21/04 (2006.01)

Patent

CA 2223984

Disclosed are a system and method for the accurately calibrated non-contact capacitive measurement of small distances between relatively movable elements. The system and method are particularly well-suited for use in environments of high temperature, pressure, and vibration, including in jet engines to measure the gap between fan blades and the engine wall. A sensor disposed in a housing wall receives constant bias voltage and forms a sensing capacitor with the moving targets, which move past the sensor. A blocking capacitor allows a signal generated at the sensor to pass to a constant gain amplifier, which amplifies the signal and passes the amplified signal to a computer for calculating the small distances between the relatively movable elements using the bias, voltage, the gain, and the maxima and/or minima of the amplified output signal.

Système et procédé permettant d'effectuer des mesures capacitives sans contact, avec un étalonnage précis, de petites distances entre des éléments relativement mobiles. Lesdits système et procédé conviennent particulièrement bien à un usage dans les environnements ou la température, la pression et les vibrations sont élevées, notamment dans les réacteurs pour mesurer l'interstice entre les aubes de soufflantes et la paroi du réacteur. Un capteur monté dans la paroi d'un logement reçoit une tension de polarisation constante et forme un détecteur capacitif par rapport aux cibles en déplacement qui passent devant lui. Un condensateur de blocage permet à un signal généré au niveau du détecteur de passer vers un amplificateur de gain constant, lequel amplifie le signal et le retransmet à un ordinateur qui calcule les petites distances séparant les éléments relativement mobiles en ayant recours à la tension de polarisation, au gain, et aux maxima et/ou aux minima du signal de sortie amplifié.

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