Elastography measurement for soft material using digital holography

Many of the distinctive and useful phenomena of soft matter come from its interaction with interfaces. Examples are the peeling of a strip of adhesive tape or the coating of a surface or the curling of a fibre via capillary forces or the electrically driven ow along a microchannel, or the collapse of a porous sponge. These interfacial phenomena are distinct from the intrinsic behaviour of a soft material like a gel or a microemulsion. Yet many forms of interfacial phenomena can be understood via common principles valid for many forms of soft matter. Our goal in organizing this school was to give students a grasp of these common principles and their many ramifications and possibilities. The school comprised over fifty 90-minute lectures over four weeks in July 2013. Four four-lecture courses by Howard Stone, Michael Cates, David Nelson, and L. Mahadevan served as an anchor for the program. A number of shorter courses and seminars rounded out the school.This volume presents lecture notes prepared by the speakers and submitted for publication after the school. The lectures are grouped under two main themes: Hydrodynamics and interfaces, and Soft matter.

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Digital Holography for Industrial Applications

2020 IEEE 18th International Conference on Industrial Informatics (INDIN) ◽

10.1109/indin45582.2020.9442155 ◽

2020 ◽

Keyword(s):

Digital Holography ◽

Industrial Applications

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Magneto-rheological abrasive finishing (MAF) of soft material using abrasives

Materials Today Proceedings ◽

10.1016/j.matpr.2021.01.629 ◽

2021 ◽

Author(s):

Rohit Rampal ◽

Tarun Goyal ◽

Deepam Goyal ◽

Manoj Mittal ◽

Rajeev Kumar Dang ◽

...

Keyword(s):

Soft Material ◽

Abrasive Finishing ◽

Magneto Rheological

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Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement

International Journal of Optics ◽

10.1155/2019/4906109 ◽

2019 ◽

Vol 2019 ◽

pp. 1-6

Author(s):

Davood Khodadad

Keyword(s):

Phase Difference ◽

Digital Holography ◽

Relative Phase ◽

Groove Depth ◽

Phase Unwrapping ◽

Shape Measurement ◽

Phase Ambiguity ◽

Holographic Method ◽

Height Range ◽

Phase Differences

We present a digital holographic method to increase height range measurement with a reduced phase ambiguity using a dual-directional illumination. Small changes in the angle of incident illumination introduce phase differences between the recorded complex fields. We decrease relative phase difference between the recorded complex fields 279 and 139 times by changing the angle of incident 0.5° and 1°, respectively. A two cent Euro coin edge groove is used to measure the shape. The groove depth is measured as ≈300 μm. Further, numerical refocusing and analysis of speckle displacements in two different planes are used to measure the depth without a use of phase unwrapping process.

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