© The Institution of Engineering and Technology
Barker coded independent component thermography (BCICT) approach known for exploiting the pulse compression properties with independent component analysis method was used to examine a mild steel sample with drilled flat-bottomed holes at various depths. This Letter emphasises the application of the probability of detection (POD) as a predictive assessment tool for the efficacy of the different methods to detect the defects at varying depths. The results exhibited that the aspect ratio of the deep defect with 90% POD and for 90% POD with 95% confidence that can be detected using the BCICT approach are 3.161 and 3.835, respectively. Besides, a relation between the POD of the defect at different depths as a feature of the defect aspect ratio (diameter/depth) has also been presented.
References
-
-
1)
-
1. Laureti, S., Sfarra, S., Malekmohammadi, H., et al: ‘The use of pulse-compression thermography for detecting defects in paintings’, Ndt & E Int., 2018, 98, pp. 147–154 (doi: 10.1016/j.ndteint.2018.05.003).
-
2)
-
2. Silipigni, G., Burrascano, P., Hutchins, D.A., et al: ‘Optimization of the pulse-compression technique applied to the infrared thermography nondestructive evaluation’, NDT & E Int., 2017, 87, pp. 100–110 (doi: 10.1016/j.ndteint.2017.01.011).
-
3)
-
3. Mulaveesala, R., Vaddi, J.S., Singh, P.: ‘Pulse compression approach to infrared nondestructive characterization’, IEE Rev. Sci. Instrum., 2008, 79, (9), p. 094901 (doi: 10.1063/1.2976673).
-
4)
-
5. Ahmad, J., Akula, A., Mulaveesala, R., et al: ‘Defect detection capabilities of independent component analysis for Barker coded thermal wave imaging’, Infrared Phys. Technol., 2020, 104, p. 103118 (doi: 10.1016/j.infrared.2019.103118).
-
5)
-
1. Mulaveesala, R., Ghali, V.S.: ‘Coded excitation for infrared non-destructive testing of carbon fiber reinforced plastics’, Rev. Sci. Instrum., 2011, 82, (5), pp. 1–6, (doi: 10.1063/1.3594551).
-
6)
-
7)
-
8. Bushberg, J.T., Boone, J.M.: ‘The essential physics of medical imaging’ (Lippincott Williams & Wilkins, USA, 2011).
-
8)
-
3. Junyan, L., Yang, L., Fei, W., et al: ‘Study on probability of detection (POD) determination using lock-in thermography for nondestructive inspection (NDI) of CFRP composite materials’, Infrared Phys. Technol., 2015, 71, pp. 448–456 (doi: 10.1016/j.infrared.2015.06.007).
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