SC20Understand and use speckle in imaging systems
Nouvelle formationSenior technician, engineer or project manager, researcher, having basic knowledge in optics and willing to investigate speckle imaging
Basic knowledge in physical optics (difraction and interferences)
Intuitive understanding of the origin of speckle
Know its main properties (size of the speckle grain, size of the speckle halo and probability distribution)
Understand the applications of speckle in imaging systems (from Fourier to subjective speckle)
Voir les sessions
Coherent optical propagation
Fourier and subjective speckle
Coherent and incoherent imaging
Applications to imaging through complex media or measurement of surface defects
- Huyghens-Fresnel's principle
- Fresnel's propagation and Fraunhofer's diffraction
- Spatial coherence (definition and intuitive understanding)
- Intuitive understanding of the origin of the speckle pattern
- Link with spatial coherence
- Study of statistical properties (intensity probability distribution, size of speckle grain and speckle halo)
- Influence of the diffuser on speckle properties
- Fourier speckle: case of a perturbation (diffuser) in between the objet and the image. Example: atmospheric turbulences in astronomy
- Subjective speckle: speckle pattern superimposed on the image when imaging a rough object. Example: coherent radar imaging
- Study elementary speckle properties (both Fourier and subjective speckle)
- Applications of speckle for measuring surfaces deformations (digital speckle pattern interferometry)
Lectures with instructive example - Intuitive approach of speckle properties
Interactive experimental demonstrations
Experimental hands-on
- Vincent Josse - Enseignant-chercheur à l'Institut d'Optique
