Laser-based, non-invasive monitoring and exponential analysis of the mechanical behaviour of materials with structural inhomogeneities in heat transfer, towards thermal equilibrium

Kosma, Kyriaki; Andrianakis, Michalis; Tornari, Vivi

doi:10.1007/s00339-022-05968-1

Cited by 6 publications

(4 citation statements)

References 40 publications

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“…Their advantages also include the capability to provide shape and displacement data with different sensitivities, measurement ranges, and spatial, spectral, and temporal resolutions depending on the application needs, while they can often be used in situ. Such optical methods include coherent light (holographic and speckle interferometry, grating interferometry) [2], [4] and noncoherent light methods (photogrammetry [5], [6], moiré fringe methods [3], structured light methods (SL) [7], [8], digital image correlation (DIC) [9], multispectral (MS) and hyperspectral imaging [10]- [12].…”

Section: Motivationmentioning

confidence: 99%

Multimodal Measurement of Parchment Using a Custom 3D Scanner

Papanikolaou,

George,

Sole

et al. 2023

archiving

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A multimodal optomechatronics system is presented for measuring and monitoring change in cultural heritage objects exposed to environmental condition fluctuations or conservation treatments. It combines structured light, 3D colour digital image correlation and multispectral imaging, delivering information about an object's 3D shape, displacements, strains and reflectivity. The high functionality and applicability of the system are presented with the example of historical parchment subjected to changes in relative humidity.

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Section: Motivationmentioning

confidence: 99%

Multimodal Measurement of Parchment Using a Custom 3D Scanner

Papanikolaou,

George,

Sole

et al. 2023

archiving

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“…But for the application of in-situ detection needs, there are certain limitations, such as the selective for material, insufficient dynamics, unsuitable for field operation, and so on. Speckle pattern interferometry serves as fast and efficient method for surface and subsurface deformation detection [11][12][13] , but the lack of carrier signal to extract internal information limits its development in internal defects detection. Photoacoustic signals 14 , actually ultrasound signals, are generated by pulsed laser and are characterized by less attenuation propagating through different objects.…”

Section: Introductionmentioning

confidence: 99%

Speckle pattern interferometry excited by pulsed laser for crack size detection

Zhu,

Chen,

Zhou

et al. 2024

International Conference on Optical and Photonic Engineering (icOPEN 2023)

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Defect detection is an important part of heritage conservation and speckle pattern interferometry is a common technique for inspecting surface and internal defects. A speckle pattern interferometry coupled with pulsed laser system for non-destructive detection and prediction of different size cracks is introduced and tested. According to photoacoustic effect, ultrasonic waves are generated by pumping a pulsed laser beam to the rear surface of the sample. The ultrasonic waves serve as carrier propagating from the rear surface to the front, thus conveying deformation and crack size information. For obtaining information about simulated crack size, the front surface is detected by a speckle pattern interferometry system. And simultaneously, the generated ultrasound waves are detected by air-coupled transducer. In this study, the introduced system and method were validated by detecting medium density fiberboards with simulated cracks of different width and depth. Differentiated speckle pattern and ultrasound signals are compared and combined to indicate crack presence and to figure out different crack size qualitatively.

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“…As the movement of the artwork's surface is a response to a natural or artificial external load, it can give qualitative and quantitative analyses of the artwork through environmental modifications. These modifications can be achieved by changing the surface temperature of the artwork, the relative humidity (RH) [2,3] of its environment or mechanical changes, or when using restoration processes such as laser cleaning with material removal [4].…”

Section: Introductionmentioning

confidence: 99%

“…The DHSPI technique [1,3,[5][6][7] has recently demonstrated its ability to measure surface displacement during environmental fluctuations to measure the impact of environmental fluctuations on artworks. As the DHSPI only acquires variations of a fringe movement, the data recorded at different times of the measurement needs to be analysed and processed before information on the perpendicular displacement of the surface can be extracted.…”

Section: Introductionmentioning

confidence: 99%

Surface Displacement Measurements of Artworks: New Data Processing for Speckle Pattern Interferometry

et al. 2022

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Curators have developed preventive conservation strategies and usually try to control the temperature (T) and relative humidity (RH) variations in the museum rooms to stabilise the artworks. The control systems chosen by museums depend on the size and age of the building, the financial means and the strategies that can be adapted. However, there is a lack of methods that can monitor mechanical changes or chemical reactions of objects in real-time or regularly. It would therefore ideally be preferable to monitor each of them to alert them to preserve them. For this purpose, a non-destructive, non-contact, full-field technique, Digital Holographic Speckle Pattern Interferometry (DHSPI), has already been developed and allows direct tracking of changes on the surface of artworks. This technique is based on phase-shifting speckle interferometry and gives the deformation of the surface below the level of the micro-meter of the analysed object. In order to monitor the deformation continuously, a large number of images are acquired by DHSPI and have to be processed. The existing process consists of removing noise from the interferogram, unwrapping this image, and deriving and displaying a 2D or 3D deformation map. In order to improve the time and accuracy of processing the imaging data, a simpler and faster processing method is developed. Using Matlab®, a denoising methodology for the interference pattern generated during data acquisition is created, based on a stationary wavelet transform. The unwrapped image is calculated using the CPULSI (Calibrated Phase Unwrapping based on Least-Squares and Iterations) algorithm as it gives the fastest results among the tested methods. The unwrapped phase is then transformed into surface displacement. This process performs these steps for each interferogram automatically. It allows access to 2D or 3D deformation maps.

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Laser-based, non-invasive monitoring and exponential analysis of the mechanical behaviour of materials with structural inhomogeneities in heat transfer, towards thermal equilibrium

Cited by 6 publications

References 40 publications

Multimodal Measurement of Parchment Using a Custom 3D Scanner

Multimodal Measurement of Parchment Using a Custom 3D Scanner

Speckle pattern interferometry excited by pulsed laser for crack size detection

Surface Displacement Measurements of Artworks: New Data Processing for Speckle Pattern Interferometry

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