Topic
Parabolic reflector
About: Parabolic reflector is a research topic. Over the lifetime, 3375 publications have been published within this topic receiving 30735 citations. The topic is also known as: paraboloid reflector & paraboloidal reflector.
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Patent•
22 Jun 2000
TL;DR: A projection light valve system as discussed by the authors consists of a ring of light sources directed toward a parabolic reflector, where the reflector reflects the light to a point of focus, and a beam expander expands the beam to irradiate a light valve.
Abstract: A projection light valve system comprises a ring of light sources directed toward a parabolic reflector. The reflector reflects the light to a point of focus. An optical means, such as a lens, directs the light to a beam expander which expands the beam to irradiate a light valve. Multiple arrangements can be used to obtain a multicolor image.
13 citations
01 Dec 1949
TL;DR: In this article, the authors extended the work of Ross on doublet lens correctors in the converging beam and showed that the residual first-order spherical aberration depends only on the power of the corrector, its elimination requiring an impracticably large power.
Abstract: Optical systems to correct the oblique aberrations of large parabolic mirrors in astronomical telescopes are discussed. The earlier work of F. E. Ross on doublet lens correctors in the converging beam is extended, and the residual first order spherical aberration is shown to depend only on the power of the corrector, its elimination requiring an impracticably large power; these results are independent of the arrangement and the optical constants of the components, and are unaffected by aspherizing the lens surfaces. Correction by two aspheric plates is shown to lead to systems of relatively great length, with consequent heavy vignetting. Finally, systems are discussed consisting of a doublet lens with one aspheric plate or secondary mirror; such a secondary mirror may be used to correct field curvature, giving corrector lenses which are afocal and therefore free from secondary spectrum, and the departure of the secondary mirror from the spherical form may be made zero by a suitable choice of the other variables. Details are given of the calculated performance of four three-component systems.
13 citations
TL;DR: In this article, a parabolic trough concentrator with surface solar mirrors made over floated soda-lime glasses with concave geometry was developed, whose measurements were 237m of aperture and 114m long, 16 mirrors were built with sizes of 3×06m and they were put together like a mosaic set.
13 citations
Patent•
29 May 2002
TL;DR: In this paper, a screen is placed between the focal point (20) of the mirror and the intersection of the normals from the mirror edges to determine the surface properties of a parabolic mirror.
Abstract: Method for determining the surface properties of a parabolic mirror (40) in which a screen is placed between the focal point (20) of the mirror and the intersection of the normals from the mirror edges. The screen has a line image on it that is reflected by the mirror to a camera detector. The actual image is compared with an ideal image and from the differences, conclusions made about the mirror surface. The invention also relates to a device for implementing the above method.
13 citations
TL;DR: In this paper, the performance of the solar parabolic dish collector with conical cavity receiver has been investigated and it is demonstrated that the average collector efficiency is in the range of 45% to 62% for various design and operating conditions.
13 citations