Performance Improvement of a Chromatic Confocal Distance Sensor for Coating Thickness Measurement on Drug-Eluting Stents

IFMBE Proceedings - World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany ◽

10.1007/978-3-642-03885-3_113 ◽

2009 ◽

pp. 406-409

Author(s):

C. Gocke ◽

C. Schultze ◽

W. Schmidt ◽

N. Grabow ◽

K. -P. Schmitz

Keyword(s):

Performance Improvement ◽

Coating Thickness ◽

Thickness Measurement ◽

Drug Eluting Stents ◽

Drug Eluting ◽

Coating Thickness Measurement ◽

Distance Sensor

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Ensuring uniformity of coating thickness measurement

Measurement Techniques ◽

10.1007/bf00979679 ◽

1991 ◽

Vol 34 (11) ◽

pp. 1103-1106

Author(s):

L. S. Babadzhanov

Keyword(s):

Coating Thickness ◽

Thickness Measurement ◽

Coating Thickness Measurement

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Non-Contact Coating Thickness Measurement

Thermal Spray 1998: Proceedings from the International Thermal Spray Conference ◽

10.31399/asm.cp.itsc1998p0875 ◽

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.

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