Star Testing Your Telescope - Backyard Astronomer`s Guide
... an 8-inch SCT produces an Airy disk half the size of the refractor’s image but with a much brighter first diffraction ring, an effect of the obstructed aperture. The two extra-focal images look more like donuts, though still identical. ...
... an 8-inch SCT produces an Airy disk half the size of the refractor’s image but with a much brighter first diffraction ring, an effect of the obstructed aperture. The two extra-focal images look more like donuts, though still identical. ...
Optics Ic
... the image quality. Slowly open the aperture and notice changes that occur after a certain aperture size – lots of stray light, which reduces the contrast in the image. This is spherical aberration. The outer edges of the lens are not focusing light properly on the image. Examine these effects with t ...
... the image quality. Slowly open the aperture and notice changes that occur after a certain aperture size – lots of stray light, which reduces the contrast in the image. This is spherical aberration. The outer edges of the lens are not focusing light properly on the image. Examine these effects with t ...
Zach Stephen Richard Worhatch Royce Grewer
... of the medium in which the lens is working, and θ is the half-angle of the maximum cone of light that can enter or exit the lens. r = 1.22λ/(NA(obj) + NA(cond)) Where r is resolution (the smallest resolvable distance between two objects) and λ is the wavelength ...
... of the medium in which the lens is working, and θ is the half-angle of the maximum cone of light that can enter or exit the lens. r = 1.22λ/(NA(obj) + NA(cond)) Where r is resolution (the smallest resolvable distance between two objects) and λ is the wavelength ...
Wave Optics
... For each point in the upper half of the opening, in the direction , there is a point in the lower half that interferes destructively with it. A dark fringe occurs in this direction. Condition for dark fringes: ...
... For each point in the upper half of the opening, in the direction , there is a point in the lower half that interferes destructively with it. A dark fringe occurs in this direction. Condition for dark fringes: ...
Off-Axis Aperture Camera: 3D Shape Reconstruction
... In this section, we test the proposed algorithm on four synthetically-generated shapes: An equifocal plane, a scene made of equifocal planes at different depths (Cube data set), a slope (Slope data set), and a wave (Wave data set). For each of these shapes we show the reconstruction results obtained ...
... In this section, we test the proposed algorithm on four synthetically-generated shapes: An equifocal plane, a scene made of equifocal planes at different depths (Cube data set), a slope (Slope data set), and a wave (Wave data set). For each of these shapes we show the reconstruction results obtained ...
SIMG-733-20092 Optics for Imaging Solutions to Final Exam
... (c) OPTIONAL BONUS: Use the results of parts (a) and (b) to estimate an “optimum” size of the pinhole in terms of the various parameters, i.e., the diameter that produces the largest cutoff frequency (of the first zero). For a pinhole with diameter d0 that is sufficiently large for geometrical optics t ...
... (c) OPTIONAL BONUS: Use the results of parts (a) and (b) to estimate an “optimum” size of the pinhole in terms of the various parameters, i.e., the diameter that produces the largest cutoff frequency (of the first zero). For a pinhole with diameter d0 that is sufficiently large for geometrical optics t ...
test - Lyle School of Engineering
... of the lens. Q=1,2,4,8,20,40, or 100. The higher Q the better the lens and therefore the more expensive. You can assume this wavefront error is present at the exit pupil of the system. You should calculate the effects of this error numerically (NOT ANALYTICALLY) to determine what the spectral resolu ...
... of the lens. Q=1,2,4,8,20,40, or 100. The higher Q the better the lens and therefore the more expensive. You can assume this wavefront error is present at the exit pupil of the system. You should calculate the effects of this error numerically (NOT ANALYTICALLY) to determine what the spectral resolu ...
Airy disk
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy; John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:...the star is then seen (in favourable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly coloured at their borders. They succeed each other nearly at equal intervals round the central disc....However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 ""On the Diffraction of an Object-glass with Circular Aperture"").Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.