Double pulse infrared thermography

Maldague, Xavier; Ziadi, Adel; Klein, M.

doi:10.1016/j.ndteint.2004.03.003

Cited by 37 publications

(20 citation statements)

References 11 publications

(3 reference statements)

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“…Vibrothermography (VT), also known as ultrasound thermography [5] or thermosonics [6], utilizes mechanical waves to directly stimulate internal defects without heating the surface as in optical methods, e.g., LT and PT[1] [7].…”

Section: Pulsed Thermography and Vibrothermography Inspectionmentioning

confidence: 99%

Infrared thermography, ultrasound C-scan and microscope for non-destructive and destructive evaluation of 3D carbon fiber materials: a comparative study

et al. 2015

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3D Carbon fiber polymer matrix composites (3D CF PMCs) are increasingly used for aircraft construction due to their exceptional stiffness and strength-to-mass ratios. However, defects are common in the 3D combining areas and are challenging to inspect. In this paper, Stitching is used to decrease these defects, but causes some new types of defects. Infrared NDT (non-destructive testing) and ultrasound NDT are used. In particular, a micro-laser line thermography technique (micro-LLT) and a micro-laser spot thermography (micro-LST) with locked-in technique are used to detect the micro-defects. In addition, a comparative study is conducted by using pulsed thermography (PT), vibrothermography (VT). In order to confirm the types of the defects, microscopic inspection is carried out before NDT work, after sectioning and polishing a small part of the sample.

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Section: Pulsed Thermography and Vibrothermography Inspectionmentioning

confidence: 99%

Infrared thermography, ultrasound C-scan and microscope for non-destructive and destructive evaluation of 3D carbon fiber materials: a comparative study

et al. 2015

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“…In [14] a slight time shift in the impulse delivery of two flash lamps allowed to perform a PPT analysis comparing two cases: heat delivered in one impulse, and heat delivered by two successive impulses of half amplitude. Since two successive impulses are already able to introduce a principal carrier with higher power it came out that the loss of impulse amplitude had little influence on the results.…”

Section: Influence Of Operational Parameters In Pmltmentioning

confidence: 99%

Thermal NDE of thick GRP panels by means of a Pulse Modulated Lock-In Thermography technique

Pitarresi

2010

EPJ Web of Conferences

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Abstract. This work describes the development and implementation of an infrared thermal NDE procedure for the evaluation of subsurface defects. The approach is called Pulse-Modulated Lock-In Thermography (PMLT) and is based on the analysis of the frequency response of the measured temperature and comparison with the carrier frequencies launched by the external heat delivering source. The heat deposited on the object is in particular modulated as a train of square waves. This is easily achieved by periodically shuttering the heat source. The temperature is then sampled throughout the deposition of a few square waves. A lock-in algorithm is then implemented able to selectively filter out components at the main carrier frequencies of the heating signal and evaluate the phase information. Defected areas at different depths can be marked based on phase contrast, by using data from a single experiment as in Pulsed-Phase Thermography. An artificially defected thick GRP panel typical of naval monolithic hull structures, is investigated to validate the proposed technique. Experimental data have confirmed the potentials of PMLT as a flexible IR NDT approach, and its ability to be implemented by means of low cost heating and IR equipments.

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“…It is not possible to reproduce such a waveform in practice, as a heat pulse provided by a powerful source such as a photographic flash, has approximately a square shape (see Maldague et al 2004 for a discussion on this). In this case, the signal is composed of periodic waves at several (but not all) frequencies.…”

Section: Basic Theorymentioning

confidence: 99%

Qualitative and quantitative assessment of aerospace structures by pulsed thermography

Ibarra-Castanedo

Genest

Servais

et al. 2007

Nondestructive Testing and Evaluation

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Pulsed thermography (PT) is an NDT&E technique allowing the remote examination of materials and systems. PT is particularly interesting for the inspection of aerospace structures since it can be used to perform safe inspection of large structures in a fast manner and without having to remove the components from the aircraft. Pulsed thermographic data however, is contaminated by noise of many forms. Fortunately, numerous signal processing techniques are available to perform qualitative and quantitative data analysis of data. In this paper, we present three processing techniques that have shown very promising results. We provide the theoretical background and experimental details as well as some representative results that highlight the pros and cons of each technique. As it will be pointed out, an interesting approach is the combination of existing processing techniques in order to use the most attractive features from each technique while reducing the non-desirable characteristics.

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Double pulse infrared thermography

Cited by 37 publications

References 11 publications

Infrared thermography, ultrasound C-scan and microscope for non-destructive and destructive evaluation of 3D carbon fiber materials: a comparative study

Infrared thermography, ultrasound C-scan and microscope for non-destructive and destructive evaluation of 3D carbon fiber materials: a comparative study

Thermal NDE of thick GRP panels by means of a Pulse Modulated Lock-In Thermography technique

Qualitative and quantitative assessment of aerospace structures by pulsed thermography

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