DIC/Moiré hybrid method based on regular patterns for deformation measurement

Wang, Zhiyong; Wu, Hao; Kang, Kai; Wang, Shibin; Li, Yuehua; Hou, Weijie; Hussain, Riaz; Li, Linan; Li, Chuanwei

doi:10.1364/oe.27.018435

Cited by 5 publications

(4 citation statements)

References 28 publications

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“…Speckles were created by printing regular lattices on plastic sheets; black lines orthogonal to each other and spaced 0.1 mm apart were printed, creating a pattern of transparent spots. The speckle virtual displacement was analysed using digital image correlation (DIC) (Helm 2008;Wang et al 2019). The principle of the DIC method is to find matching regions with precise locations between the reference image and the target image using a correlation function resulting in determination of the speckles displacement field.…”

Section: Transmission-speckle Methodsmentioning

confidence: 99%

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Experiments on Marangoni spreading – evidence of a new type of interfacial instability

Huang

et al. 2023

J. Fluid Mech.

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Marangoni spreading on thin films is widely observed in nature and applied in industry. It has serious implications for airway drug delivery, especially in surfactant displacement therapy. This paper reports the results of experimental investigations of a surfactant-laden droplet spreading on films made of more viscous Newtonian fluids as well as on films made of viscoelastic fluids. The experiments used particle seeding, the transmission-speckle method and particle tracking velocimetry (PTV) to determine the deformation of the film–droplet interface and to measure velocity fields. Radially aligned patterns were observed on Newtonian films. Similar patterns, but with much smaller wavenumber, were observed on viscoelastic films in combination with rapid azimuthal variations of the film thickness. The Saffman–Taylor instability at the film–droplet interface explains the formation of patterns on a more viscous Newtonian film, and their onset requires exceeding the critical capillary number. The pattern formation on viscoelastic films is correlated with an instability at the film–droplet–air contact line when the liquid is expelled radially by the spreading droplet. PTV revealed azimuthal variations of the velocity field in the vicinity of the contact line. The observed contact line instability is different from previously reported fingering instabilities of Newtonian thin films. A simple scaling law accounting for the Marangoni-stress-induced elastic shear deformation is proposed to describe the flow field in the patterns formed in the viscoelastic films.

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Section: Transmission-speckle Methodsmentioning

confidence: 99%

“…The speckle virtual displacement was analysed using digital image correlation (DIC) (Helm 2008; Wang et al. 2019). The principle of the DIC method is to find matching regions with precise locations between the reference image and the target image using a correlation function resulting in determination of the speckles displacement field.…”

Section: Methodsmentioning

confidence: 99%

Experiments on Marangoni spreading – evidence of a new type of interfacial instability

Huang

et al. 2023

J. Fluid Mech.

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“…This motivates the use of checkerboard for DIC. Some researchers introduced tricks for limiting the risk that DIC traps in local minima [37,42,43]. Generally, such approaches break pattern periodicity or introduce local changes of contrast.…”

Section: Principle Of Virtual Dic -Practical Case Of Optimal Patternsmentioning

confidence: 99%

“…Such checkerboard patterns can be easily processed by a spectral technique such as Localized Spectrum Analysis (LSA) [41]. Nevertheless, pattern periodicity traps DIC in local minima and researchers have proposed to depreciate the pattern to resolve this problem [37,42,43].…”

Section: Introductionmentioning

confidence: 99%

Introducing Virtual DIC to Remove Interpolation Bias and Process Optimal Patterns

et al. 2023

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