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- W2079142657 abstract "Infrared lock-in thermography is a novel non-destruction testtechnique (NDT). It allows for defect detection insubsurface of structures. This technique depends on transmission and reflection of periodic heat flux which is launchedinto the inspection structure. Defects can be indicated by comparing phases of surface temperature. Heat conductionmodel is utilized to describe the transmitting process of sinusoidal (cosinusoidal) modulated heat flux in metal plates.Effect of modulation frequency on detection depth and detectivity is investigated. Experiments are carried out to inspectmetal plates with artificial defects in room-temperature. A sinusoidal (cosinusoidal) modulated lamp is used as activeheat source. Image sequences are collected by infrared camera and processed to obtain lock-in phase image by CedipInfrared System. In frequency domain, phase images can be used to analyze the effects of modulation frequency ondetecting defects in different size and depth. Experiments indicate that the detectivity will be reduced if the modulationfrequency is lowered in order to detect deeper defects. A method is proposed to achieve deeper detection depth andhigher detectivity, in order to obtain accurate results." @default.
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- W2079142657 date "2009-05-11" @default.
- W2079142657 modified "2023-09-27" @default.
- W2079142657 title "Effect of modulation frequency on detecting defects of metal plates using infrared lock-in thermography" @default.
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- W2079142657 doi "https://doi.org/10.1117/12.828780" @default.
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