Abstract
In thermal/infrared nondestructive testing (T/I NDT), the presence of noise in the infrared signal is an inconvenience in the method. It is convenient to introduce two extreme types of T/I NDT noise: (1) this type is purely additive and is defined by background reflections and the IR detector and (2) this is purely multiplicative and is defined by the material's absorptivity/emissivity variations. Multiple T/I NDT tests performed on various materials have shown that none of materials reveal a 'pure′ additive or multiplicative type of noise. However, in the case of optical heating, many composite and black-painted materials exhibit multiplicative noise with a noise contrast of C n=2-5%, and this determines the defect detection limits. The C n concept has been applied to a graphite epoxy composite to demonstrate that the maximum depth of detected defects in a one-sided procedure is about 4 mm. Also, in 1-10 mm-thick black-painted steel, the minimum detectable material loss is from 3% to 9%.
| Original language | English |
|---|---|
| Pages (from-to) | 16-23 |
| Number of pages | 8 |
| Journal | NDT and E International |
| Volume | 61 |
| DOIs | |
| Publication status | Published - 2014 |
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Keywords
- Defects
- Infrared thermography
- Noise
- Theoretical modeling
ASJC Scopus subject areas
- Materials Science(all)
- Mechanical Engineering
- Condensed Matter Physics
Cite this
Noise-limited thermal/infrared nondestructive testing. / Vavilov, V.
In: NDT and E International, Vol. 61, 2014, p. 16-23.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Noise-limited thermal/infrared nondestructive testing
AU - Vavilov, V.
PY - 2014
Y1 - 2014
N2 - In thermal/infrared nondestructive testing (T/I NDT), the presence of noise in the infrared signal is an inconvenience in the method. It is convenient to introduce two extreme types of T/I NDT noise: (1) this type is purely additive and is defined by background reflections and the IR detector and (2) this is purely multiplicative and is defined by the material's absorptivity/emissivity variations. Multiple T/I NDT tests performed on various materials have shown that none of materials reveal a 'pure′ additive or multiplicative type of noise. However, in the case of optical heating, many composite and black-painted materials exhibit multiplicative noise with a noise contrast of C n=2-5%, and this determines the defect detection limits. The C n concept has been applied to a graphite epoxy composite to demonstrate that the maximum depth of detected defects in a one-sided procedure is about 4 mm. Also, in 1-10 mm-thick black-painted steel, the minimum detectable material loss is from 3% to 9%.
AB - In thermal/infrared nondestructive testing (T/I NDT), the presence of noise in the infrared signal is an inconvenience in the method. It is convenient to introduce two extreme types of T/I NDT noise: (1) this type is purely additive and is defined by background reflections and the IR detector and (2) this is purely multiplicative and is defined by the material's absorptivity/emissivity variations. Multiple T/I NDT tests performed on various materials have shown that none of materials reveal a 'pure′ additive or multiplicative type of noise. However, in the case of optical heating, many composite and black-painted materials exhibit multiplicative noise with a noise contrast of C n=2-5%, and this determines the defect detection limits. The C n concept has been applied to a graphite epoxy composite to demonstrate that the maximum depth of detected defects in a one-sided procedure is about 4 mm. Also, in 1-10 mm-thick black-painted steel, the minimum detectable material loss is from 3% to 9%.
KW - Defects
KW - Infrared thermography
KW - Noise
KW - Theoretical modeling
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UR - http://www.scopus.com/inward/citedby.url?scp=84885336025&partnerID=8YFLogxK
U2 - 10.1016/j.ndteint.2013.09.002
DO - 10.1016/j.ndteint.2013.09.002
M3 - Article
VL - 61
SP - 16
EP - 23
JO - NDT and E International
JF - NDT and E International
SN - 0963-8695
ER -