Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1984-10-12
1987-06-23
Strecker, Gerard R.
Communications: electrical
Continuously variable indicating
With particular transmitter
324 61R, 324 61P, G01R 2726, G01B 714, G01L 310
Patent
active
046756701
ABSTRACT:
A method and an apparatus for the dynamic and non-contact measurement of the distance separating the surface of a first part that may be conductive or not, from the surface of at least one second conductive part closely spaced from the first conductive part. The method resides in positioning, on the surface of the first part, at least one sensor including two conductive plates that are parallel, superimposed and electrically insulated from one another. The two plates of this at least one sensor are then fed with a same high frequency signal under the same voltage and the current generated by this high frequency signal, between the plate of the sensor which is closest to the surface of the second conductive part and this second conductive part, is measured. This measured current varying as an inverse function of the distance separating the surface of the second conductive part from the surface of the sensor which is closest to this second conductive part, it is then easy to determine the value of the distance separating the first and second conductive parts as a function of the value of the measured current. This method as well as the apparatus for carrying it out are particularly well adapted for measuring the air gap in any type of rotating machine such as an electric generator.
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Bourgeois Jean Marc
Cloutier Marius
Lalonde Francois
Hydro - Quebec
Solis Jose M.
Strecker Gerard R.
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