Quantitative evaluation of optical lock-in and pulsed thermography for aluminum foam material

Duan, Yuxia; Huebner, Stefanie; Haßler, Ulf; Osman, Ahmad; Ibarra-Castanedo, Clemente; Maldague, Xavier

doi:10.1016/j.infrared.2013.05.009

Cited by 57 publications

(25 citation statements)

References 17 publications

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“…One is response a data method that uses quantitative stimulus responses as the reference. The other method uses hit/miss data, where "1" indicates that a defect is found, and "0" indicates that a defect is not found [29]. In this article, a statistical thermo-PoD on the basis of the hit/miss method was performed, which is shown in Table 3 [30].…”

Section: Thermo-podmentioning

confidence: 99%

Pulsed micro-laser line thermography on submillimeter porosity in carbon fiber reinforced polymer composites: experimental and numerical analyses for the capability of detection

et al. 2016

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In this article, pulsed micro-laser line thermography (pulsed micro-LLT) was used to detect the submillimeter porosities in a 3D preformed carbon fiber reinforced polymer composite specimen. X-ray microcomputed tomography was used to verify the thermographic results. Then, finite element analysis was performed on the corresponding models on the basis of the experimental results. The same infrared image processing techniques were used for the experimental and simulation results for comparative purposes. Finally, a comparison of experimental and simulation postprocessing results was conducted. In addition, an analysis of probability of detection was performed to evaluate the detection capability of pulsed micro-LLT on submillimeter porosity.

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Section: Thermo-podmentioning

confidence: 99%

Pulsed micro-laser line thermography on submillimeter porosity in carbon fiber reinforced polymer composites: experimental and numerical analyses for the capability of detection

et al. 2016

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“…The FT can be used with any waveform and has the advantage of denoising the signal. 46 3 Results Analysis Figure 7 shows micro-CT slices from the position of 141 mm shown in Fig. 1 (b).…”

Section: Tablementioning

confidence: 99%

Comparative study of microlaser excitation thermography and microultrasonic excitation thermography on submillimeter porosity in carbon fiber reinforced polymer composites

et al. 2016

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, "Comparative study of microlaser excitation thermography and microultrasonic excitation thermography on submillimeter porosity in carbon fiber reinforced polymer composites," Opt. Eng. Abstract. Stitching is used to reduce incomplete infusion of T-joint core (dry-core) and reinforce T-joint structure. However, it may cause new types of flaws, especially submillimeter flaws. Thermographic approaches including microvibrothermography, microlaser line thermography, and microlaser spot thermography on the basis of pulsed and lock-in techniques were proposed. These techniques are used to detect the submillimeter porosities in a stitched T-joint carbon fiber reinforced polymer composite specimen. X-ray microcomputed tomography was used to validate the thermographic results. Finally an experimental comparison of microlaser excitation thermography and microultrasonic excitation thermography was conducted.

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“…The equation, which represents the heat source and generate a continuous sinusoidal wave is given by, 11,23 …”

Section: Finite Element Analysis (Fea)mentioning

confidence: 99%

“…The excitation frequency is chosen based on the diffusion length of a thermal signal and the images are extracted. [23][24][25] The size of defects can be measured directly from the thermal images by exactly knowing the spatial resolution of the employed optic. 17 However, detailed information about defect parameters such as size, depth and thermal resistance can be obtained by applying postprocessing procedures to the thermograms.…”

Section: Introductionmentioning

confidence: 99%

Investigation of lock-in infrared thermography for evaluation of subsurface defects size and depth

Shrestha

Kang

Kim

2015

Int. J. Precis. Eng. Manuf.

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In this study, the investigation on lock-in infrared thermography was done for the detection and estimation of artificial subsurface defects size and depth in stainless steel sample. The experimental and the finite element analysis were performed at several excitation frequencies to interrogate the sample ranging from 0.182 down to 0.021 Hz. A finite element model using 'ANSYS 14.0' was used to completely simulate the lock-in thermography. The four point method was used in post processing of every pixel of thermal images using the MATLAB programming language. A signal to noise ratio analysis was performed on both phase and amplitude images in each excitation frequency to determine the optimum frequency. The relationship of the phase value with respect to excitation frequency and defect depths was examined. Amplitude image was quantitatively analyzed using Vision Assistant, a special tool in LABVIEW program to acquire the defects size. The phase image was used to calculate the defects depth considering the thermal diffusivity of the material and the excitation frequency for which the defects become visible. A finite element analysis result was found to have good correlation with experimental result and thus demonstrated potentiality in quantification of subsurface defects.

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Quantitative evaluation of optical lock-in and pulsed thermography for aluminum foam material

Cited by 57 publications

References 17 publications

Pulsed micro-laser line thermography on submillimeter porosity in carbon fiber reinforced polymer composites: experimental and numerical analyses for the capability of detection

Pulsed micro-laser line thermography on submillimeter porosity in carbon fiber reinforced polymer composites: experimental and numerical analyses for the capability of detection

Comparative study of microlaser excitation thermography and microultrasonic excitation thermography on submillimeter porosity in carbon fiber reinforced polymer composites

Investigation of lock-in infrared thermography for evaluation of subsurface defects size and depth

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