Dynamic speckle

In physics, dynamic speckle is a result of the temporal evolution of a speckle pattern where variations in the scattering elements responsible for the formation of the interference pattern in the static situation produce the changes that are seen in the speckle pattern, where its grains change their intensity (grey level) as well as their shape along time.wikipedia
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Speckle pattern

specklelaser specklespeckle noise
In physics, dynamic speckle is a result of the temporal evolution of a speckle pattern where variations in the scattering elements responsible for the formation of the interference pattern in the static situation produce the changes that are seen in the speckle pattern, where its grains change their intensity (grey level) as well as their shape along time.
When the speckle pattern changes in time, due to changes in the illuminated surface, the phenomenon is known as dynamic speckle, and it can be used to measure activity, by means of, for example, an optical flow sensor (optical computer mouse).

Biospeckle laser tool library

These and other methods are gathered in Biospeckle laser tool library.
The biospeckle laser tool library, or BSLTL, is a free project to help researchers to work with dynamic speckle.

Speckle noise

speckleImage Despeckling
Speckle noise
The speckle can also represent some useful information, particularly when it is linked to the laser speckle and to the dynamic speckle phenomenon, where the changes of the speckle pattern, in time, can be a measurement of the surface's activity.

Speckle imaging

speckle interferometryspeckle interferometricimaging
Speckle imaging
The technique, also known as dynamic speckle enables real-time monitoring of dynamical systems and video image analysis to understand biological processes.

Physics

physicistphysicalphysicists
In physics, dynamic speckle is a result of the temporal evolution of a speckle pattern where variations in the scattering elements responsible for the formation of the interference pattern in the static situation produce the changes that are seen in the speckle pattern, where its grains change their intensity (grey level) as well as their shape along time.

Scattering

light scatteringscatteredscatter
In physics, dynamic speckle is a result of the temporal evolution of a speckle pattern where variations in the scattering elements responsible for the formation of the interference pattern in the static situation produce the changes that are seen in the speckle pattern, where its grains change their intensity (grey level) as well as their shape along time.

Wave interference

interferencedestructive interferenceconstructive interference
In physics, dynamic speckle is a result of the temporal evolution of a speckle pattern where variations in the scattering elements responsible for the formation of the interference pattern in the static situation produce the changes that are seen in the speckle pattern, where its grains change their intensity (grey level) as well as their shape along time.

Doppler effect

Dopplerdoppler shiftDoppler shifts
The measurements that are obtained by means of the analysis tools present the activity level as a sum of the contributions of phenomena due to Doppler effect of the scattered light as well as other phenomena eventually present (time variations of the refractive index of the sample, etc.) Light scattered with small Doppler shifts in its frequency beats on the detector (eventually the eye) giving rise to the slow intensity variations that constitute the dynamic of the speckle pattern.

Foam

frothfoamslather
Other fields of application are the analysis of drying paint, control in gels, foams, corrosion, efflorescence, etc.

Corrosion

corrosion resistancecorrodecorrosive
Other fields of application are the analysis of drying paint, control in gels, foams, corrosion, efflorescence, etc.

Efflorescence

efflorescenteffloresceeffloresces
Other fields of application are the analysis of drying paint, control in gels, foams, corrosion, efflorescence, etc.