Quantitative inspection of coating thickness by flash-pulse thermography and time-power transformation evaluation

2020 ◽  
Vol 59 (17) ◽  
pp. E29 ◽  
Author(s):  
M. Švantner ◽  
L. Muzika ◽  
Š. Houdková
Keyword(s):  
Coating Thickness ◽  
Power Transformation ◽  
Pulse Thermography

scholarly journals Quantitative Inspection of Coatings Thickness by Time-Power Transformation Flash Pulse Thermographic Method

Proceedings ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 32 ◽  
Author(s):  
Švantner ◽  
Muzika ◽  
Houdková
Keyword(s):  
Coating Thickness ◽  
Transformation Method ◽  
Quantitative Information ◽  
Evaluation Methods ◽  
Power Transformation ◽  
Inspection Method ◽  
Thermally Sprayed Coatings ◽  
Thickness Variations ◽  
Thermally Sprayed ◽  
Sprayed Coatings

Thermographic testing is an inspection method, which primary indicates a presence of discontinuities in a tested sample. Its application to coatings can indicate a presence of local thickness variations; however, it mostly does not bring a quantitative information about a thickness of the coatings. This contribution is focused on a quantification of the thermographic inspection, which would make possible an evaluation of coating thickness differences. A flash pulse thermographic testing was applied to thermally sprayed coatings. An importance of a precise synchronization of a flash-source and thermographic recording was determined. Different evaluation methods were analyzed and their comparison showed that a time-power transformation method is the most suitable for a quantification of the inspection results.

scholarly journals Laser Scanning Thermography for Coating Thickness Inspection

2021 ◽  
Vol 8 (1) ◽  
pp. 17
Author(s):  
Lukas Muzika ◽  
Michal Svantner ◽  
Milan Honner ◽  
Sarka Houdkova
Keyword(s):  
Coating Thickness ◽  
Laser Scanning ◽  
Processing Technique ◽  
Surface Point ◽  
Power Laser ◽  
Ir Camera ◽  
New Approach ◽  
Pulse Thermography ◽  
Temperature Responses ◽  
Higher Sensitivity

The paper deals with a new approach to laser thermography for the inspection of coating thickness. The approach is based on scanning the specimen surface point by point, using a low-power laser, and recording the temperature responses with an IR camera. A recorded sequence is then transformed into a sequence similar to a flash pulse thermography sequence. Fast Fourier transform was used as a processing technique. The results are compared with a flash pulse thermography measurement. It was shown that the laser thermography measurement provides a higher sensitivity to thickness changes than flash pulse thermography measurement.

X-RAY STUDIES RELATED TO COATING THICKNESS MEASUREMENTS

1984 ◽  
Vol 45 (C2) ◽  
pp. C2-33-C2-36 ◽  
Author(s):  
D. A. Sewell ◽  
I. D. Hall ◽  
G. Love ◽  
J. P. Partridge ◽  
V. D. Scott
Keyword(s):  
Coating Thickness ◽  
X Ray ◽  
Thickness Measurements

Analysis of methods for checking coating thickness gauges

Metrologiya ◽  
2019 ◽  
pp. 3-16
Author(s):  
V.S. Sekatsky ◽  
O.A. Gavrilova ◽  
N.V. Merzlikina ◽  
V.N. Morgun Morgun
Keyword(s):  
Coating Thickness

Novel Development of Power Transformation Technology Supporting Electric Power and Energy

2012 ◽  
Vol 132 (5) ◽  
pp. 388-391
Author(s):  
Kenji Okubo ◽  
Shoji Nishimura ◽  
Yutaka Goda ◽  
Yoshihiro Baba
Keyword(s):  
Electric Power ◽  
Power Transformation ◽  
Power And Energy

Evaluation of the accuracy indicators in determination of the coating thickness by crater grinding method

2020 ◽  
Vol 86 (7) ◽  
pp. 39-44
Author(s):  
K. V. Gogolinsky ◽  
A. E. Ivkin ◽  
V. V. Alekhnovich ◽  
A. Yu. Vasiliev ◽  
A. E. Tyurnina ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Functional Dependence ◽  
Measurement Procedure ◽  
Metrological Certification ◽  
Measuring Instruments ◽  
Properties Of Coatings ◽  
Special Equipment ◽  
Grinding Method ◽  
Accuracy Of Measurements ◽  
Wide Range

Thickness is one of the key indicators characterizing the quality and functional properties of coatings. Various indirect methods (electromagnetic, radiation, optical) most often used in practice to measure thickness are based on the functional dependence of a particular physical parameter of the system «base – coating» on the coating thickness. The sensitivity of these procedures to the certain properties of coatings imposes the main restriction to the accuracy of measurements. Therefore, the development and implementation of the approaches based on direct measurements of geometric parameters of the coating appears expedient. These methods often belong to the class of «destructive» and, in addition to measuring instruments, require the use of special equipment. To ensure the uniformity of measurements in the laboratory or technological control, these methods are isolated as a separate procedure (method) and must undergo metrological certification in accordance with GOST R 8.563–2009. We present implementation, metrological certification and practical application of the method for measuring thickness of coatings by crater-grinding method. The principles of technical implementation of test equipment, measurement procedure and calculation formulas are described. The results of evaluating the accuracy indicators of the proposed procedure by calculation and experimental methods are presented. In both cases, the relative error did not exceed 6%. The applicability of the developed technique is shown for a wide range of coating materials (from soft metals to superhard ceramics) of different thickness (with from units to hundreds of micrometers). Apart from the goals of process control and outgoing inspection, the method can be recommended as a reference measurement procedure for calibration of measures and adjusting samples for various types of thickness gauges.

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