Ensuring uniformity of coating thickness measurement

1991 ◽  
Vol 34 (11) ◽  
pp. 1103-1106
Author(s):  
L. S. Babadzhanov
Keyword(s):  
Coating Thickness ◽  
Thickness Measurement ◽  
Coating Thickness Measurement

Non-Contact Coating Thickness Measurement

1998 ◽  
Author(s):  
P.E. Chandler ◽  
M.B.C. Quigley ◽  
J.F. Fletcher
Keyword(s):  
Coating Thickness ◽  
Thickness Measurement ◽  
Coating Structure ◽  
Line Measurement ◽  
Infra Red ◽  
On Line ◽  
Coating Thickness Measurement ◽  
Accuracy Of Measurement ◽  
Engine Components ◽  
Spraying Process

Abstract There are many instances of coatings that require a nondestructive and non-contact measure of coating thickness as part of a quality control system. Specifically, this paper reports on experiments carried out on non-contact measurements of MCrAIY and TBC coatings. The system uses an infra red beam from a solid state laser to generate a thermal wave in the coating. When this wave reaches the substrate an interference effect is caused. The modulated input heating produces a modulated output infra red signal from the surface and at a different wavelength from the laser beam. The output signal has a phase difference from the input signal which is related to the coating thickness. As neither the laser nor the detector are in contact with the surface of the coating and the temperature of the coating is raised by only a few degrees this represents a non-contact NDE system. This system has been tested across a range of coating/substrate combinations. In this paper we give examples of MCrAIY and TBC coatings applied to engine components demonstrating that the accuracy of measurement is only limited by the roughness of the coating structure and substrate. The use of this system for on-line measurement during the spraying process is also discussed and results presented.

At-line validation of optical coherence tomography as in-line/at-line coating thickness measurement method

2019 ◽  
Vol 572 ◽  
pp. 118766 ◽  
Author(s):  
Matthias Wolfgang ◽  
Anna Peter ◽  
Patrick Wahl ◽  
Daniel Markl ◽  
J. Axel Zeitler ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Coating Thickness ◽  
Measurement Method ◽  
Thickness Measurement ◽  
Optical Coherence ◽  
Coating Thickness Measurement
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