Method for measuring a thickness of a coating

Details Method for measuring a thickness of a coating Method for measuring a thickness of a coating

2008-01-15

2008-01-15

Lauchman, Layla G. (Department: 2877)

Optics: measuring and testing

Dimension

Thickness

C356S369000, C356S511000, C356S496000, C374S045000, C374S057000

Reexamination Certificate

active

11227154

ABSTRACT:
A method for measuring a thickness of a coating of a constructional unit, in particular a heat-compatible coating on a component of a gas turbine, includes measuring coordinates of the constructional unit three-dimensionally with a measuring device, in particular an optical scanner, before and after the coating, a thermal distortion of the constructional unit being recorded during the coating and the thickness of the coating being determined from a comparison of the measured constructional unit coordinates before and after the coating. The thermal distortion of the constructional unit is taken into account in the thickness determination of the coating by a comparison with at least one reference point at an uncoated location.

REFERENCES:
patent: 4745291 (1988-05-01), Niiya
patent: 5258824 (1993-11-01), Carlson et al.
patent: 5311286 (1994-05-01), Pike
patent: 6301009 (2001-10-01), Tinker
patent: 2002/0031164 (2002-03-01), Scheidt et al.
patent: 0 121 617 (1984-10-01), None
Sheard, S.J., and M.G. Somekh, Measurement of opaque coating thickness using photothermal radiometry, Applied Physics Letters 53 (26), Dec. 1988.

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