Combined laser spot imaging thermography and ultrasonic measurements for crack detection

Burrows, S. E.; Rashed, Ahmed Nabih Zaki; Almond, D.P.; Dixon, Steve

doi:10.1080/10589750701448605

Cited by 70 publications

(30 citation statements)

References 7 publications

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“…In order to do this, a proper synchronization between an IR camera, laser controller and manipulator moving the optical head needs to be maintained. The post processing algorithms in this case are more complex as has been described in [14][15][16].…”

Section: Laser Spot Thermographymentioning

confidence: 99%

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Nondestructive Testing of Ceramic Hip Joint Implants with Laser Spot Thermography

Roemer

Pieczonka

Juszczyk

et al. 2017

Archives of Metallurgy and Materials

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T he paper presents an application of laser spot thermography for damage detection in ceramic samples with surface breaking cracks. The measurement technique is an active thermographic approach based on an external heat delivery to a test sample, by means of a laser pulse, and signal acquisition by an infrared camera. Damage detection is based on the analysis of surface temperature distribution near the exciting laser spot. The technique is nondestructive, non-contact and allows for full-field measurements. Surface breaking cracks are a very common type of damage in ceramic materials that are introduced in the manufacturing process or during the service period. This paper briefly discusses theoretical background of laser spot thermography, describes the experimental test rig and signal processing methods involved. Damage detection results obtained with laser spot thermography are compared with reference measurements obtained with vibrothermography. This is a different modality of active thermography, that has been previously proven effective for this type of damage. We demonstrate that both measurement techniques can be effectively used for damage detection and quality control applications of ceramic materials.

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Section: Laser Spot Thermographymentioning

confidence: 99%

“…The energy in this test modality is delivered to the surface of a structure in the form of a laser pulse [14][15][16][17]. Energy deposited on a surface is converted into heat and propagates through the material in form of thermal waves that propagate radially, away from the excitation location.…”

Section: Laser Spot Thermographymentioning

confidence: 99%

Nondestructive Testing of Ceramic Hip Joint Implants with Laser Spot Thermography

Roemer

Pieczonka

Juszczyk

et al. 2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

“…15,16 Fiber orientation detection using laser spot thermography was reported in 2013. 17,18 Further studies on surface cracks [19][20][21] and fiber orientation 22,23 were reported recently.…”

Section: Laser Spot Thermography and Lock-in Thermographymentioning

confidence: 99%

Comparative study on submillimeter flaws in stitched T-joint carbon fiber reinforced polymer by infrared thermography, microcomputed tomography, ultrasonic c-scan and microscopic inspection

et al. 2015

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Abstract. Stitching is used to reduce dry-core (incomplete infusion of T-joint core) and reinforce T-joint structure. However, it may cause new types of flaws, especially submillimeter flaws. In this paper, microscopic inspection, ultrasonic c-scan, pulsed thermography, vibrothermography and laser spot thermography are used to investigate the internal flaws in a stitched T-joint CFRP. Then, a new micro-laser line thermography is proposed. Micro-CT is used to validate the infrared results. A comparison between micro-laser line thermography and micro-CT is performed. As a conclusion, micro-laser line thermography can detect the internal submillimeter defects. However, the depth and the size of defects can affect the detection results. The micro-porosities with a diameter of less than 54 µm are not detected in the micro-laser line thermography results. Micro-laser line thermography can detect the micro-porosity (a diameter of 0.162 mm) from the depth of 90 µm. However, it cannot detect the internal micro-porosity (a diameter of 0.216 mm) from the depth of 0.18 mm. The potential causes are given. Finally a comparative study is conducted.

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“…The influences of crack opening and depth to the measurement results were discussed using the 2D finite element method (FEM). On the basis of this work, a combination of thermographic and ultrasonic techniques, using the laser for both thermal and acoustical excitation, was suggested [16,17].…”

Section: Introductionmentioning

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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Combined laser spot imaging thermography and ultrasonic measurements for crack detection

Cited by 70 publications

References 7 publications

Nondestructive Testing of Ceramic Hip Joint Implants with Laser Spot Thermography

Nondestructive Testing of Ceramic Hip Joint Implants with Laser Spot Thermography

Comparative study on submillimeter flaws in stitched T-joint carbon fiber reinforced polymer by infrared thermography, microcomputed tomography, ultrasonic c-scan and microscopic inspection

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

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