This speckle pattern
is characteristic for a particular surface element just like a fingerprint and if that surface element is undergoing a pure displacement [[Delta].
One of the proposed methods is based on the use of the "time contrast" of the speckle pattern history.
The speckle pattern is produced by the interference between the coherent waves coming from the different microscopic elements of the surface.
In 1988, they predicted that a small shift in the angle at which a laser beam enters a multiply scattering medium such as a translucent glass block would also shift the speckle pattern -- without significantly altering its basic structure.
When you change the incoming laser beam a little bit, you get a new speckle pattern, which again looks random," Feng says.
Phase Evaluation in Temporal Speckle Pattern
Interferometry Using Time-Frequency Methods (Alejandro Federico and Guillermo H.
Light shining through an optical fiber attached to a robot arm generates a characteristic speckle pattern
depending on the arm's position.
A computer program searches the collection of images, called a speckle pattern
, for geometric correlations, out of which it can generate either images or dimensions of the object.
While some researchers argued that the speckle patterns
arose only because of the staining and preserving processes used during experiments, others interpreted the patterns as indications of internal structure.
To develop techniques to fabricate speckle patterns
that can survive long-term harsh environment.
The speckle patterns are inspected under the microscope and recorded on a camera at a high frame rate.
Scientists then make a diagnosis based on statistical correlations in speckle patterns between healthy and diseased cells.
Spatial compounding reduces acoustic noise by generating several frames of data with independent information and averaging those frames with the help of speckle patterns