Method and apparatus for determining thickness of a...

Measuring and testing – Vibration – Resonance – frequency – or amplitude study

Reexamination Certificate

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C073S597000, C073S602000, C073S644000

Reexamination Certificate

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07066027

ABSTRACT:
A method and apparatus of determining the thickness of a lubricant film disposed between two bodies by measuring and performing a frequency spectrum analysis on a reflected or transmitted part of an ultrasound wave propagated towards said film is disclosed.

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International Search Reportfor corresponding PCT application No. PCT/GB 01/03800 filed on Aug. 24, 2001. Report dated Dec. 11, 2001.
Kinra V K et al., “Simultaneous Measurement of the Acoustical Properties of Thin-Layered Medium: The Inverse Problem” Journal of the Acoustical Society of America, American Institute of Physics, New York, US, vol. 95, No. 6, Jun. 1, 1994, pp. 3059-3074.
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