Rayleigh Criterion

Generalized Rayleigh criterion for non-axisymmetric centrifugal instabilities

Overcoming the rayleigh criterion limit with optical vortices.

We experimentally and numerically tested the separability of two independent equally luminous monochromatic and white light sources at the diffraction limit, using optical vortices (OV). The diffraction pattern of one of the two sources crosses a fork hologram on its center generating the Laguerre-Gaussian (LG) transform of an Airy disk. The second source, crossing the fork hologram in position...

Degree of Roughness of Rough Layers: Extensions of the Rayleigh Roughness Criterion and Some Applications

In the domain of electromagnetic wave propagation in the presence of rough surfaces, the Rayleigh roughness criterion is a widelyused means to estimate the degree of roughness of considered surface. In this paper, this Rayleigh roughness criterion is extended to the case of rough layers. Thus, it provides an interesting qualitative tool for estimating the degree of electromagnetic roughness of ...

Thermoacoustic instabilities: Should the Rayleigh criterion be extended to include entropy changes?

The Rayleigh criterion (which measures the correlation between pressure and heat release) is the standard tool used to investigate and predict combustion instabilities both in experimental and numerical studies. However, the Rayleigh term is just one of the terms appearing in the acoustic energy equation. The recent development of Large Eddy Simulations (LES) for combustion chambers allows to c...

Beyond the Rayleigh criterion: grating assisted far-field optical diffraction tomography.

We propose an optical imaging system, in which both illumination and collection are done in far field, that presents a power of resolution better than one-tenth of the wavelength. This is achieved by depositing the sample on a periodically nanostructured substrate illuminated under various angles of incidence. The superresolution is due to the high spatial frequencies of the field illuminating ...