Long-Term Effects of Cyclic Environmental Conditions on Paintings in Museum Exhibition by Laser Shearography

Khaleghi, Morteza; Dobrev, Ivo; Harrington, Ellery; Klausmeyer, Philip; Cushman, Matthew; Furlong, Cosme

doi:10.1007/978-3-319-00768-7_36

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…(7), ϕðm; n; tÞ is computed for modulus 2π, which requires further processing to obtain a continuous phase distribution by application of spatiotemporal phase unwrapping algorithms. 2,26 The pointwise evaluation of the correlation coefficients assumes that ϕðm; n; tÞ varies slower in space ðm; nÞ than all of the other parameters in Eqs. (1) and (2) and is sufficiently constant within a spatial kernel 16 (i.e., small spatial neighborhood of measurement points).…”

Section: Phase Sampling Based On 2 þ 1 Frame Local Correlationmentioning

confidence: 99%

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Full-field transient vibrometry of the human tympanic membrane by local phase correlation and high-speed holography

et al. 2014

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Abstract. Understanding the human hearing process would be helped by quantification of the transient mechanical response of the human ear, including the human tympanic membrane (TM or eardrum). We propose a new hybrid high-speed holographic system (HHS) for acquisition and quantification of the full-field nanometer transient (i.e., >10 kHz) displacement of the human TM. We have optimized and implemented a 2 þ 1 frame local correlation (LC) based phase sampling method in combination with a high-speed (i.e., >40 K fps) camera acquisition system. To our knowledge, there is currently no existing system that provides such capabilities for the study of the human TM. The LC sampling method has a displacement difference of <11 nm relative to measurements obtained by a four-phase step algorithm. Comparisons between our high-speed acquisition system and a laser Doppler vibrometer indicate differences of <10 μs. The high temporal (i.e., >40 kHz) and spatial (i.e., >100 k data points) resolution of our HHS enables parallel measurements of all points on the surface of the TM, which allows quantification of spatially dependent motion parameters, such as modal frequencies and acoustic delays. Such capabilities could allow inferring local material properties across the surface of the TM. © The Authors.Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Phase Sampling Based On 2 þ 1 Frame Local Correlationmentioning

confidence: 99%

“…3. 17,25,26 Hardware modules are managed by a unified control software with a user interface for setting and customizing acquisition and synchronization parameters. 28 To perform high-speed transient measurements of a TM sample, the user is required to specify the following parameters:…”

Section: Hardware and Software Implementation Of The Acquisitionmentioning

confidence: 99%

Full-field transient vibrometry of the human tympanic membrane by local phase correlation and high-speed holography

et al. 2014

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“…In some cases, the sensitivity is desired to be adjustable [14,15]. In Michelson interferometers with one of the mirrors tilted [9], the shearing distance can be changed while the angle of the mirror is changed.…”

Section: Comparing Rp With Wpmentioning

confidence: 99%

Digital Shearing Speckle Pattern Interferometry Based on Rochon Prism and Its Application

Wang

Gao

et al. 2019

Applied Sciences

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This paper presents improved digital shearing speckle pattern interferometry based on Rochon Prism. The advantage of this method is that it avoids the shadow noise caused by transmission light, which improves the shearography accuracy. By reducing the angle of divergence and coordinating the measuring distance and the precision coordinate, the beam-splitting path of the interference optical path is improved. Experimental results prove that the improved method contributes to the practical and instrumental application of shearography.

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“…This optical phase sampling method was chosen because of its superior spatial resolution, allowing for a quantification of the phase sampling at each pixel individually. The specific choice of the number of phase shifts and phase step size was defined on the basis of pilot studies of shearographic measurements on oil-on-canvas paintings in our laboratory settings Khaleghi et al, 2014) as well as literature (Kalms and Jueptner, 2005;Morawitz et al, 2013). Further work might be needed to find an optimal phase sampling technique and corresponding acquisition parameters; however, the ones used in this work were deemed sufficient for our preliminary work.…”

Section: Measurements Of Optical Phase Changesmentioning

confidence: 99%

The Noninvasive Analysis of Painted Surfaces: Scientific Impact and Conservation Practice

Nevin

Doherty²

2016

Smithsonian Contributions to Museum Conservation

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Smithsonian Institution Scholarly Press s m i t h s o n i a n c o n t r i b u t i o n s t o m u s e u m c o n s e r v a t i o n • n u m b e r 5The Noninvasive Analysis of Painted Surfaces Scientific Impact and Conservation Practice Edited by Austin Nevin and Tiarna Doherty SERIES PUBLICATIONS OF THE SMITHSONIAN INSTITUTIONEmphasis upon publication as a means of "diffusing knowledge" was expressed by the first Secretary of the Smithsonian. In his formal plan for the Institution, Joseph Henry outlined a program that included the following statement: "It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge." This theme of basic research has been adhered to through the years by thousands of titles issued in series publications under the Smithsonian imprint, commencing with Smithsonian Contributions to Knowledge in 1848 and continuing with the following active series: Published by SMITHSONIAN INSTITUTION SCHOLARLY PRESS

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Long-Term Effects of Cyclic Environmental Conditions on Paintings in Museum Exhibition by Laser Shearography

Cited by 6 publications

References 3 publications

Full-field transient vibrometry of the human tympanic membrane by local phase correlation and high-speed holography

Full-field transient vibrometry of the human tympanic membrane by local phase correlation and high-speed holography

Digital Shearing Speckle Pattern Interferometry Based on Rochon Prism and Its Application

The Noninvasive Analysis of Painted Surfaces: Scientific Impact and Conservation Practice

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