Thermal non destructive testing: short history and state-of-art

Вавилов, В. П.

doi:10.21611/qirt.1992.028

Cited by 29 publications

(26 citation statements)

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“…In the past few decades, thermography has found applications in numerous scientific fields and industries, paving the way from an exotic remote sensing method of warm objects to a quantitative method of non-destructive evaluation [5,6]. Modern thermographic techniques utilize fast and highprecision devices for collection of data about surface thermal distribution.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Independent Structural Images for Principal Component Thermography

Gavrilov

Maev

2018

Applied Sciences

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Thermography is a powerful tool for non-destructive testing of a wide range of materials. Thermography has a number of approaches differing in both experiment setup and the way the collected data are processed. Among such approaches is the Principal Component Thermography (PCT) method, which is based on the statistical processing of raw thermal images collected by thermal camera. The processed images (principal components or empirical orthogonal functions) form an orthonormal basis, and often look like a superposition of all possible structural features found in the object under inspection-i.e., surface heating non-uniformity, internal defects and material structure. At the same time, from practical point of view it is desirable to have images representing independent structural features. The work presented in this paper proposes an approach for separation of independent image patterns (archetypes) from a set of principal component images. The approach is demonstrated in the application of inspection of composite materials as well as the non-invasive analysis of works of art.

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Section: Introductionmentioning

confidence: 99%

Extraction of Independent Structural Images for Principal Component Thermography

Gavrilov

Maev

2018

Applied Sciences

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“…The developed flash thermography-based NDE procedure is shown to provide high precision, reliable data, correlated with mechanical measurements. Developed for defect detection [3][4][5][6][7], this technique is fast, noncontact and relatively inexpensive. Current report communicates our results and mathematical underpinnings of the method.…”

Section: Introductionmentioning

confidence: 99%

Thermography in manufacturing: nondestructive evaluation of ultrasonic spot welds of automotive battery pack

Shpartko¹,

Lev²,

Kondratyev³

et al. 2012

Proceedings of the 2012 International Conference on Quantitative InfraRed Thermography

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Flash thermography-based nondestructive evaluation (NDE) procedure for inspection of spot welds of automotive battery packs has been developed. A mathematical model of heat propagation has been proposed. The underlying equations have been solved analytically for simple geometry and numerically, using ANSYS FEA package, for the case of general geometry. Based on the proposed model, the size of the fused area of spot welds was determined from thermographic experiments and a correlation with direct measurements was obtained.In a separate set of experiments, the response to a typical flash impulse was determined and the characteristics of the heat pulse were determined by using least square approximation. The reconstructed shape of the flash impulse was used for NDE of welds between thin sheets.

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“…The photothermal signal collected by the infrared radiometer depends on parameters governing these physical phenomena (thermal conductivity, thermal diffusivity …), but also on all the parameters being able to be correlated to these last ones (presence of delamination, presence of crack …). The method offers to the engineers a means of characterization of these various parameters [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Random photothermal thermography: Principle and examples of applications

Bodnar

Caron²

2010

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography

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The photothermal thermography is a procedure of non-destructive control which finds numerous applications in the field of the control and characterization of the thin materials. This technique is classically implemented under CW excitation or under flash analysis (crenel). In our laboratory, we looked, just like what we had made in punctual photothermal radiometry, to implement it under random excitation. This last technique seems to allow indeed, with regard to the previous ones, the control of more fragile materials as well as the access to extend multi frequencies analysis. Having reminded the principle of the random photothermal thermography and having presented an example of experimental device, we show that the method allows under lesser energy constraints, on one hand the detection of detachments situated in mural paintings and on the other hand, detection of a defect situated in a block of plaster while leading only a weak rise of temperature.

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Thermal non destructive testing: short history and state-of-art

Cited by 29 publications

References 0 publications

Extraction of Independent Structural Images for Principal Component Thermography

Extraction of Independent Structural Images for Principal Component Thermography

Thermography in manufacturing: nondestructive evaluation of ultrasonic spot welds of automotive battery pack

Random photothermal thermography: Principle and examples of applications

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