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Improving the probing depth of thermographic inspections of polymer composite materials

Improving the probing depth of thermographic inspections of polymer composite materials
Improving the probing depth of thermographic inspections of polymer composite materials
The maximum depth for which a defect of a given size can be detected in thermographic inspections is known as the ‘probing depth’. For materials such as polymer composites, with low through-thickness thermal diffusivity, inspections are limited to thin materials or near surface inspection. With the aim of improving probing depth, the paper describes how established signal processing techniques are adapted for thermographic inspections. The procedures are implemented for both Pulse Thermography (PT) and Pulse Phase Thermography (PPT) inspections of laminated composite materials and sandwich structures. It is demonstrated that the adaptation significantly improves the probing depth, identifying defects that could not be identified using existing procedures. The applicability of the new approaches is discussed, paying particular attention to systematic and random errors resulting from equipment setup. Simple and efficient compensation methods to reduce the effect these errors are presented.
Pulse Thermography (PT),, Pulse Phase Thermography (PPT),, Composite Materials,, Image Processing.
0957-0233
Olafsson, Geir
cb8fc3ba-3d1a-4a91-bbe4-99ba87e8eae9
Tighe, Rachael
bb6e82da-7adc-47e1-9fd2-664521945658
Barton, Janice
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Olafsson, Geir
cb8fc3ba-3d1a-4a91-bbe4-99ba87e8eae9
Tighe, Rachael
bb6e82da-7adc-47e1-9fd2-664521945658
Barton, Janice
9e35bebb-2185-4d16-a1bc-bb8f20e06632

Olafsson, Geir, Tighe, Rachael and Barton, Janice (2019) Improving the probing depth of thermographic inspections of polymer composite materials. Measurement Science and Technology. (doi:10.1088/1361-6501/aaed15).

Record type: Article

Abstract

The maximum depth for which a defect of a given size can be detected in thermographic inspections is known as the ‘probing depth’. For materials such as polymer composites, with low through-thickness thermal diffusivity, inspections are limited to thin materials or near surface inspection. With the aim of improving probing depth, the paper describes how established signal processing techniques are adapted for thermographic inspections. The procedures are implemented for both Pulse Thermography (PT) and Pulse Phase Thermography (PPT) inspections of laminated composite materials and sandwich structures. It is demonstrated that the adaptation significantly improves the probing depth, identifying defects that could not be identified using existing procedures. The applicability of the new approaches is discussed, paying particular attention to systematic and random errors resulting from equipment setup. Simple and efficient compensation methods to reduce the effect these errors are presented.

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G.Olafsson_2018_Accepted_MS_UoS - Accepted Manuscript
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More information

Accepted/In Press date: 31 October 2018
e-pub ahead of print date: 21 December 2018
Published date: February 2019
Keywords: Pulse Thermography (PT),, Pulse Phase Thermography (PPT),, Composite Materials,, Image Processing.

Identifiers

Local EPrints ID: 426135
URI: http://eprints.soton.ac.uk/id/eprint/426135
ISSN: 0957-0233
PURE UUID: 2c0a6a76-2353-4e73-adcd-9754890209b5

Catalogue record

Date deposited: 15 Nov 2018 17:30
Last modified: 07 Oct 2020 05:19

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