Collimatedbeam

A collimated beam of light or other electromagnetic radiation has parallel rays, and therefore will spread minimally as it propagates. A perfectly collimated light beam, with no divergence, would not disperse with distance. However, diffraction prevents the creation of any such beam.Light can be approximately collimated by a number of processes, for instance by means of a collimator. Perfectly collimated light is sometimes said to be focused at infinity. Thus, as the distance from a point source increases, the spherical wavefronts become flatter and closer to plane waves, which are perfectly collimated. Other forms of electromagnetic radiation can also be collimated. In radiology, X-rays are collimated to reduce the volume of the patient's tissue that is irradiated, and to remove stray photons that reduce the quality of the x-ray image ("film fog"). In scintigraphy, a gamma ray collimator is used in front of a detector to allow only photons perpendicular to the surface to be detected.The term collimated may also be applied to particle beams – a collimated beam – where typically shielding blocks of high density materials (such as lead, bismuth alloys, etc) may be used to absorb or block peripheral particles from a desired forward direction, especially a sequence of such absorbing collimators. This method of particle collimation is routinely deployed and is ubiquitous in every particle accelerator complex in the world. An additional method enabling this same forward collimation effect, less well studied, may deploy strategic nuclear polarization (magnetic polarization of nuclei) if the requisite reactions are designed into any given experimental applications.

Quick Reference. The plane that is perpendicular to the optical axis of a lens and that passes through the optical centre. A thick lens has two principal planes ...

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Just like expensive aspheric camera lenses, aspheric eyeglass lenses provide a wider area of clear vision than traditional spherical lenses. Those conventional lenses have a narrower area of clear vision, so that vision distortion may be aroused if you look away from the lens center. This improvement is probably contributed by the comparably flat profile of aspheric lenses. Compared with traditional lenses that are much thicker and bulge out, aspheric lenses are able to provide better visual acuity at the edge.

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To collimate means to adjust or align the line of sight of an optical instrument so that the light rays are parallel to each other. This ensures that the instrument produces a clear, sharp and focused image. It is often used in the context of telescopes, microscopes, surveying equipment, and lasers.

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Collimation synonyms

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Collimate telescope

Aspheric lenses are now available both in single vision and multifocal groups. Complex curves on aspheric lenses require more time and skills from the optician in lens measurements and fitting, so that a higher price is reasonable. Remember that aspheric lenses have much more complicated curves across the surface. Their cosmetic and visual benefits deserve a higher price. The frame selection of aspheric lenses is also a little more complex than those frames for spherical lenses.

In addition, anti-reflective coating is nearly necessary for all aspheric lenses, since the closer distance between the lens and the wearer’s eye brings more reflection from the lens’ front and back surfaces. The reason is that aspheric eyeglasses should be positioned closer to the face. With such a distance, visible reflections on the front and back surfaces may occur. This consequential problem can be resolved by applying an anti-reflective coating to the lenses.

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202419 — These specifications tell you the optical performance, such as magnification, aberration correction, and other parameters.

Collimationdefinitiontelescope

Collimated definitionphysics

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Providing a diverse range of ultrafast methods in a single location, including electronic and vibrational spectroscopy.

Collimation X ray

Collimated definitionbeam

to render parallel to a certain line or direction; to bring into the same line, as the axes of telescopes, etc.; to render parallel, as rays of light

Although all aspheric lenses offer a slimmer appearance for every prescription, they have different shapes while dealing with different vision problems. Aspheric lenses for myopia correction are thinnest at the center and thickest at the edge, while those for hyperopia correction are thicker in the center and thinner in the edge. Even if certain portions of aspheric lenses are thicker than other parts, they do have brought an overall thickness reduction.

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Collimationdefinitionin radiography

Unlike spherical lenses, aspheric lenses have different curvatures on their front surface. It is commonly known that spherical lenses have the same curve across the entire surface. The changes in curvature allow aspheric lenses to have flatter curves than conventional lenses, bringing a thinner and slimmer appearance. From another perspective, an aspheric lens has a profile that is rotationally symmetric, but not a portion of a sphere. In addition to appearance improvement, glasses made of aspheric lenses can still reduce or eliminate spherical aberration as well as other optical aberrations.

With flattery curves, the center of an aspheric lens fits closer to the wearer’s face. These aspheric lenses bring both more natural external world and more natural the wearer’s eyes. Spherical lenses for heavy hyperopia magnify both the wearer’s eyes and the surrounding objects, while those conventional lenses for myopia minify these things. Both of these two opposite visual distortions bring unnatural images. What’s worse, they result in “bug-eyed” or “beady-eyed” appearance. In contrast, aspheric lenses distort the wearer’s eyes less as seen by other people. Typically this can be deemed an improvement on aesthetic appearance. For a large portion of eyewear users, this improvement is quite critical. In particular, patients with a heavy presbyopia or myopia can benefit from these lenses more than usual.

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In conventional lens types, a heavy prescription usually requires thicker lenses to provide enough visual correction. Those current thinner aspheric lenses eliminate worries about thick lenses for people with serious vision problems. These flattery lenses also bring less bulging from the frame. In most cases, an aspheric design is combined with high-index lens materials, resulting in quite slimmer, thinner and slighter lenses. Besides usual high-index materials, regular plastic can also be used to manufacture aspheric lenses.