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  2. Angular resolution - Wikipedia

    en.wikipedia.org/wiki/Angular_resolution

    The result, θ = 4.56/D, with D in inches and θ in arcseconds, is slightly narrower than calculated with the Rayleigh criterion. A calculation using Airy discs as point spread function shows that at Dawes' limit there is a 5% dip between the two maxima, whereas at Rayleigh's criterion there is a 26.3% dip. [3]

  3. Dawes' limit - Wikipedia

    en.wikipedia.org/wiki/Dawes'_limit

    Dawes' limit is a formula to express the maximum resolving power of a microscope or telescope. [1] It is so named after its discoverer, William Rutter Dawes , [ 2 ] although it is also credited to Lord Rayleigh .

  4. Sparrow's resolution limit - Wikipedia

    en.wikipedia.org/wiki/Sparrow's_resolution_limit

    Sparrow's resolution limit is nearly equivalent to the theoretical diffraction limit of resolution, the wavelength of light divided by the aperture diameter, and about 20% smaller than the Rayleigh limit. For example, in a 200 mm (eight-inch) telescope, Rayleigh's resolution limit is 0.69 arc seconds, Sparrow's resolution limit is 0.54 arc seconds.

  5. Optical resolution - Wikipedia

    en.wikipedia.org/wiki/Optical_resolution

    One of the methods specifies that, on the line between the center of one point and the next, the contrast between the maximum and minimum intensity be at least 26% lower than the maximum. This corresponds to the overlap of one Airy disk on the first dark ring in the other. This standard for separation is also known as the Rayleigh criterion.

  6. Airy disk - Wikipedia

    en.wikipedia.org/wiki/Airy_disk

    The Rayleigh criterion for barely resolving two objects that are point sources of light, such as stars seen through a telescope, is that the center of the Airy disk for the first object occurs at the first minimum of the Airy disk of the second. This means that the angular resolution of a diffraction-limited system is given by the same formulae.

  7. Thermo-acoustic instability - Wikipedia

    en.wikipedia.org/wiki/Thermo-acoustic_instability

    A very simple mechanism of acoustic amplification was first identified by Lord Rayleigh in 1878. [4] [5] In simple terms, Rayleigh criterion states that amplification results if, on the average, heat addition occurs in phase with the pressure increases during the oscillation. [1].

  8. Diffraction-limited system - Wikipedia

    en.wikipedia.org/wiki/Diffraction-limited_system

    The observation of sub-wavelength structures with microscopes is difficult because of the Abbe diffraction limit. Ernst Abbe found in 1873, [ 2 ] and expressed as a formula in 1882, [ 3 ] that light with wavelength λ {\displaystyle \lambda } , traveling in a medium with refractive index n {\displaystyle n} and converging to a spot with half ...

  9. Rayleigh criterion - Wikipedia

    en.wikipedia.org/wiki/Rayleigh_criterion

    Rayleigh criterion may refer to: Angular resolution § The Rayleigh criterion, optical angular resolution; Taylor–Couette flow § Rayleigh's criterion, instability ...