Pulsed Laser Spot Imaging Thermography, Modelling and Experimental Data

Li, T.; Almond, D.P.; Rees, D. Andrew S.; Weekes, B.; Pickering, Simon; Thompson, Donald O.; Chimenti, Dale E.

doi:10.1063/1.3362426

Cited by 2 publications

(4 citation statements)

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“…These figures indicate that the technique, theoretically, has sensitivity adequate for many real inspection requirements. Very similar results are obtained for laser-spot heating [36].…”

Section: Modelling Results Concerning the Operating Parameters And Th...supporting

confidence: 85%

“…Results for the laser line source are presented here. Those for the laser spot have been presented elsewhere [36].…”

Section: Crack Extraction Based On Modelling and Experimental Resultsmentioning

confidence: 99%

“…In this paper, an investigation of LLT as a means of detecting and imaging cracks is presented. Details of a similar investigation of LST have been published elsewhere [12,13,36]. Numerical modelling results are presented in section 2 that show similarities in the characteristics of the two techniques and the sensitivity of the LTT technique to crack geometry.…”

Section: Introductionmentioning

confidence: 99%

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Crack imaging by scanning laser-line thermography and laser-spot thermography

Almond

Rees

2011

Meas. Sci. Technol.

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The thermographic images of laser heated spots or lines are perturbed by nearby cracks, providing NDE techniques for crack detection. Scanning with a laser line, rather than a laser spot, results in a substantial reduction in inspection time. 3D finite difference modelling results are presented that show the sensitivity of the laser line thermography technique to cracks of varying lengths, depths and openings. A novel crack imaging technique is presented that is based on assembling second spatial derivative thermal images of a scanned laser line. Experimental results show the new technique to image cracks with openings as small as a few micrometres. The scanning time of the laser line thermography technique is shown to be over an order of magnitude smaller than that of the laser spot thermography technique whilst producing crack images of similar quality.

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“…These figures indicate that the technique, theoretically, has sensitivity adequate for many real inspection requirements. Very similar results are obtained for laser-spot heating [36].…”

Section: Modelling Results Concerning the Operating Parameters And Th...supporting

confidence: 85%

“…Results for the laser line source are presented here. Those for the laser spot have been presented elsewhere [36].…”

Section: Crack Extraction Based On Modelling and Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crack imaging by scanning laser-line thermography and laser-spot thermography

Almond

Rees

2011

Meas. Sci. Technol.

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“…For image processing techniques, the same group published an article on a second-derivative image processing method to extract micron-cracks after raster scanning a focused laser spot in 2010 [ 67 ]. Usually, raw infrared images are processed by methods, such as baseline subtraction, three-dimensional matched filtering or spatial derivation.…”

Section: Multi-wave Phenomena and Imagingmentioning

confidence: 99%

Multi-Wave and Hybrid Imaging Techniques: A New Direction for Nondestructive Testing and Structural Health Monitoring

Cheng

Deng

Cao

et al. 2013

Sensors

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In this article, the state-of-the-art multi-wave and hybrid imaging techniques in the field of nondestructive evaluation and structural health monitoring were comprehensively reviewed. A new direction for assessment and health monitoring of various structures by capitalizing the advantages of those imaging methods was discussed. Although sharing similar system configurations, the imaging physics and principles of multi-wave phenomena and hybrid imaging methods are inherently different. After a brief introduction of nondestructive evaluation (NDE), structure health monitoring (SHM) and their related challenges, several recent advances that have significantly extended imaging methods from laboratory development into practical applications were summarized, followed by conclusions and discussion on future directions.

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Pulsed Laser Spot Imaging Thermography, Modelling and Experimental Data

Cited by 2 publications

References 1 publication

Crack imaging by scanning laser-line thermography and laser-spot thermography

Crack imaging by scanning laser-line thermography and laser-spot thermography

Multi-Wave and Hybrid Imaging Techniques: A New Direction for Nondestructive Testing and Structural Health Monitoring

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