Digital speckle photography and speckle tomography in heat transfer studies

Asseban, A.; Lallemand, M.; Saulnier, Jean-Bernard; Фомин, Н. А.; Lavinskaja, E.; Merzkirch, W.; Vitkin, D.

doi:10.1016/s0030-3992(00)00095-5

Cited by 34 publications

(12 citation statements)

References 23 publications

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“…On the other hand, to visualize the nonwoven hemp mat with higher image resolution and for detecting the zones where the sample has a lack of fibers, the use of NIR/SWIR is very useful, as well as the combined use of different techniques applied on PT data. EOF 14 was also interesting to allow image fusion if applied together with DSP and the visible image, in order to confirm the shape of the subsurface damage provoked by the indentation test (P area). The use of advanced thermographic processing approaches, such as PCT, provided images seeing through the nonwoven mat of hemp, allowing identifying resinstarved areas or enhancing the difference between materials nature.…”

Section: Discussionmentioning

confidence: 99%

Monitoring of jute/hemp fiber hybrid laminates by nondestructive testing techniques

Сфарра

Ibarra-Castanedo

Santulli

et al. 2014

Science and Engineering of Composite Materials

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Abstract:Damage following static indentation of jute/hemp (50 wt.% total fiber content) hybrid laminates was detected by a number of nondestructive testing (NDT) techniques, in particular, near (NIR) and short-wave (SWIR) infrared reflectography and transmittography, infrared thermography (IRT), digital speckle photography (DSP), and holographic interferometry (HI), to discover and evaluate real defects in a laminate with a complex structure. A comparative study between thermographic data acquired in the mid-(MWIR) and long-wave infrared (LWIR) spectrum bands, by pulsed (PT) and square pulse (SPT) thermography, is reported and analyzed. A thermal simulation by COMSOL ® Multiphysics (COMSOL Inc., Burlington, MA, USA) to validate the heating provided is also added. The robust SOBI (SOBI-RO) algorithm, available into the ICALAB Toolbox (BSI RIKEN ABSP Lab, Hirosawa, Japan) and operating in the MATLAB ® (The MathWorks, Inc., Natick, MA, USA) environment, was applied on SPT data with results comparable to the ones acquired by several thermographic techniques. Finally, segmentation operators were applied both to the NIR/SWIR transmittography images and to a characteristic principal component thermography (PCT) image (EOF s ) to visualize damage in the area surrounding indentation.

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Section: Discussionmentioning

confidence: 99%

Monitoring of jute/hemp fiber hybrid laminates by nondestructive testing techniques

Сфарра

Ibarra-Castanedo

Santulli

et al. 2014

Science and Engineering of Composite Materials

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“…DSCM can get the full-field displacement by comparing the location of each pixel in speckle images before and after deformation, and then the strain fields on the concrete surface can be obtained from the longitudinal displacement (i.e., the displacement parallel to the direction of principal tensile stress) and the loading-direction displacement. The primary principles of the DSCM system were discussed in detail in Refs [23][24][25]. Since the cohesive crack is very tiny comparing with the specimen size, the cohesive-crack path cannot be directly detected by a non-destructive method.…”

Section: Dscm Systemmentioning

confidence: 99%

Real-time Detection and Analysis of Damage in High-performance Concrete under Cyclic Bending

et al. 2009

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In order to quantitatively evaluate the damage level in high-performance concrete (HPC) with pozzolanic minerals under constant amplitude cyclic loads, three methods for real-time damage detection are employed in the present work, i.e., dynamic modulus instrument, realtime strain collector, and digital speckle correlative method (DSCM). Six mechanical parameters at different numbers of loading cycles are real-time captured by these three methods. For a maximum applied fatigue stress equal to 70% of the static flexural strength, a cohesive crack is detected on the specimen surface by the DSCM system from 10% of concrete fatigue life. The nucleation and propagation of the cohesive crack is reflected by the change of the strain concentration zone in 2-dimensional strain fields. The experimental results show that the admixtures of Class F Fly Ash (FA) and S95 Ground Granulated Blast-furnace Slag (GGBS) in high proportions increase the strain and cohesivecrack opening displacement as well as remarkably improve the fatigue performance of HPC.

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“…Several other researchers have also processed absorption and interferometry data by means of optical tomography for measuring the 3-D temperature and concentration fields in processes involving fluid flow [13,137,190,224,306,317,323,490]. Recently, liquid crystal thermography and speckle imaging have also been coupled with computerized tomography to reconstruct 3-D temperature fields in fluid flow processes [11,324]. 6.…”

Section: Applications Of Optical Tomographymentioning

confidence: 99%

Imaging techniques for mapping solution parameters, growth rate, and surface features during the growth of crystals from solution

Verma

Shlichta

2008

Progress in Crystal Growth and Characterization of Materials

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Digital speckle photography and speckle tomography in heat transfer studies

Cited by 34 publications

References 23 publications

Monitoring of jute/hemp fiber hybrid laminates by nondestructive testing techniques

Monitoring of jute/hemp fiber hybrid laminates by nondestructive testing techniques

Real-time Detection and Analysis of Damage in High-performance Concrete under Cyclic Bending

Imaging techniques for mapping solution parameters, growth rate, and surface features during the growth of crystals from solution

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