An innovative imaging technique captures how a gel deforms (arrows and colours) as a crack propagates through it. Credit: S. Aime et al./Phys. Rev. Lett.
Optics and photonics
Scattered light yields full picture of tiny motions
Researchers have developed an optical imaging technique that can track microscopic displacements over a field of view that spans several centimetres.
In research areas from condensed-matter physics to fluid mechanics, the dynamics of physical systems are studied by following the motion of their constituent elements. However, imaging techniques typically involve a trade-off between the extent of the movement that can be tracked and the overall observation area.
Stefano Aime at the PSL University in Paris and his colleagues have developed a solution to this problem through a combination of imaging and laser-light scattering. Their approach can measure displacements as small as 10 nanometres over an area spanning a few square centimetres.
To demonstrate the technique, the team captured how a substance called a colloidal gel deformed as a crack propagated through it. The researchers found that the deformation process differed from that predicted by conventional fracture mechanics. The technique could provide insights into previously unobservable phenomena, the researchers say.
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August 25, 2021 at 07:57PM
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Scattered light yields full picture of tiny motions - Nature.com
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