Non-contact measuring method and apparatus for producing a...

G - Physics – 01 – B

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G01B 7/14 (2006.01) G01B 7/02 (2006.01) G01D 5/241 (2006.01)

Patent

CA 2429164

A non-contact measuring method and apparatus for producing a signal (34) representative of a distance (e) between facing surfaces of a first (3) and second parts (5), which are closely spaced apart such as the rotor and stator of an electric rotating machine. The method resides in positioning a sensor (7) on the surface of the first part (3). The sensor (7) includes first (9) and second (11) parallel, superimposed conductive plates electrically insulated from one another. The second plate (11) is located in between the first plate (9) and the surface of the first part (3). The first plate (9) is fed with a high frequency signal through a resistance (19). A high impedance, low input capacity, unitary gain voltage amplifier (27) is fed with the high frequency signal through the resistance (19). The second plate (11) is fed with an output signal (31) of the amplifier (27). The output signal (31) of the amplifier (27) is directly proportional to the distance (e) between the two surfaces (3, 5). The sensor (7) acts as a capacitance in a low pass RC-filtercircuit where R is the resistance (19). The sensor (7) may be adapted to determine discharges in the stator when mounted the roter.

Un appareil et une méthode de mesure sans contact servant à produire un signal représentatif d'une distance séparant des surfaces opposées d'une première et deuxième parties, qui sont étroitement espacées telles le rotor et le stator d'une machine électrique rotative. La méthode réside dans le positionnement d'un capteur sur la surface de la première partie. Le capteur inclut une première et deuxième plaques parallèles, surimposées et conductrices qui sont électriquement isolées l'une de l'autre. La deuxième plaque est située entre la première plaque et la surface de la première partie. La première plaque est alimentée par un signal de haute fréquence à travers une résistance. Un amplificateur de voltage à gain unitaire de haute impédance et de basse capacité d'entrée est alimenté avec le signal de haute fréquence à travers la résistance. La deuxième plaque est alimentée avec un signal de sortie de l'amplificateur. Le signal de sortie de l'amplificateur est directement proportionnel à la distance séparant les deux surfaces.

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