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Influence of surface roughness on thermography measurement
University West, Department of Engineering Science, Division of Automation Systems.
2014 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This university Bachelor's Thesis was performed to explore the influence of surface roughness on the thermography measurement.

Thermography is a non-destructive testing method which can be used to detect cracks. However, it is hard to define how the surface roughness influences the emissivity and the result of a thermography measurement, as well as how the angle of the excitation source influences the result. Therefore, this work aims to define how the heating angle and surface roughness influence the thermography measurement, define the relationship between surface roughness and emissivity for the same crack, and define the influence of the angles which composed of the heating source, the direction of crack and the direction of surface roughness on thermography measurement.

In this report, the theories of radiation and Signal-to-noise ratio (SNR) were explained, clearly. Also, two kinds of experiments were set up. One is focus on how the heating angle influence the thermography measurement, the other is focus on how the angle of the heating source, in relation to the crack direction and the direction of surface roughness, influence the SNR value.

The conclusions of these experiments are that the heating of a crack increases as the angle decreases (from wide side to narrow side) and the angle ofincreases (from horizontal to vertical). Moreover, the SNR value decreases as the surface roughness increases. For the same surface roughness, the SNR value increases with increased crack angle (0°, 45° or 90°) and with decreased sample position angle (horizontal, 45°or vertical). What is more, the higher surface roughness, the larger the influence of the crack angle and the sample position angle. Finally, when the surface is polish, the crack angle and the sample position angle does not have any influence.

Place, publisher, year, edition, pages
2014. , 20 p.
Keyword [en]
Emissivity, Surface roughness, thermography measurement, crack direction, direction of surface roughness
National Category
Robotics
Identifiers
URN: urn:nbn:se:hv:diva-6842Local ID: EXC580OAI: oai:DiVA.org:hv-6842DiVA: diva2:755581
Subject / course
Robotics
Educational program
Robotteknik
Supervisors
Examiners
Available from: 2014-10-20 Created: 2014-10-15 Last updated: 2015-02-05Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
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  • Other locale
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