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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TL;DR: In this article, a light guide assembly is proposed to pump a Nd:YAG laser rod within a two-dimensional elliptical-cylindrical (2D-EL-CYL) cavity with intervening optics.
12 citations
Patent•
25 Mar 1988
TL;DR: In this article, a spectrmeter radiation transmission system is described, which permits concurrent availability of numerous alternative accessory devices by conserving radiation throughput, and the parabolic reflectors are used to provide alternating collimated and confocal segments of radiation.
Abstract: A spectrmeter radiation transmission system is disclosed which permits concurrent availability of numerous alternative accessory devices by conserving radiation throughput. Parabolic reflectors are used to provide alternating collimated and confocal segments of radiation, thereby largely eliminating the problem of vignetting (i.e., loss of radiation throughput due to beam size expansion). Modular enclosure elements are provided, inside which the radiation path travels between the parabolic reflectors.
11 citations
Patent•
12 Feb 1993
TL;DR: In this article, a cylindrical mirror in a shape of a frustum of a circular cone on the downstream side of a metal halide lamp was used to make reflected light from a light collecting reflector into a parallel light beam by a mirror.
Abstract: PURPOSE:To make reflected light from a light collecting reflector into a parallel light beam by a mirror and to improve the utilization efficiency the emitted light of a light source arranged at the focus of the light collecting reflector by arranging a cylindrical mirror in a shape of a frustum of a circular cone on the downstream side of the light source CONSTITUTION:A cylindrical mirror 10 in the shape of the frustum of the circular cone is provided on the optically downstream side of a metal halide lamp 1 and the light converging reflector 7 consisting of a parabolic mirror and an optical element such as a polarization beam splitter 6 is arranged on the downstream side of them The mirror 10 is arranged so that its comic surface having the vertex positioned on an optical axis passing the focus of the reflector 7, namely, so that the center axis is aligned with the optical axis In this case, the mirror 10 is reduced in diameter in the light emission direction Consequently, the reflected light from the light collecting reflector 7 is further reflected by the mirror 10 to become an effective light beam Further, even light which is angled too much to the optical axis in the primary reflection of the reflector 7 becomes close to parallel light in the secondary reflection based upon the angle of an external mirror surface 10b
11 citations
TL;DR: In this article, a simple method is presented for making these measurements, and results are given for a particular 60-ft diameter reflector, where the surface errors have a Gaussian distribution relative to the focal point, and simple theory indicates that the received power relative to that from a perfect reflecting surface is P/P_{0} = \exp -(2\pi \sigma / \lambda)^{2} where sigma is the standard deviation of surface errors and lambda is the operating wavelength.
Abstract: One of the important factors affecting the efficiency of parabolic reflector antennas is the degree to which the surface of the reflector deviates from the true parabolic shape. For a given reflector surface it is also important to locate the focal point of the best-fit paraboloid relative to the existing feed support structure. A simple method is presented for making these measurements, and results are given for a particular 60-ft diameter reflector. Static measurements were made with the antenna axis pointed vertically upwards, and changes were also measured as a function of elevation angle and wind. When the surface errors have a Gaussian distribution relative to the focal point, simple theory indicates that the received power relative to that from a perfect reflecting surface is P/P_{0} = \exp -(2\pi \sigma / \lambda)^{2} where \sigma is the standard deviation of the surface errors and \lambda is the operating wavelength.
11 citations
01 Jul 2016
TL;DR: In this paper, a new design of the parabolic dish solar concentrator using dual reflector Gregorian method has been presented, which applies an additional reflector to place the engine generator in the bottom of the primary reflector parabolic dishes.
Abstract: Parabolic Dish Solar Concentrator (PDSC) are commonly used to generate electricity from thermal energy employing Stirling engine, steam, photovoltaic and thermoelectric generator. Heat concentrator of Parabolic Dish (PD) is used for focusing radiation of the sun into the receiver that connected to the generator system. The conventional generator system is located above the focus of the primary reflector parabolic dish. This paper presents a new design of the parabolic dish solar concentrator using dual reflector Gregorian method. The design applies an additional reflector to place the engine generator in the bottom of the primary reflector parabolic dish. The design was verified using “SolTrace”, a software package for tracing the solar ray. It found that the heat flux collected was 0.73 MW/m2 for the designed parabolic with 300 cm primary diameter. This parabolic have obtained 594.65x geometry concentration ratio and 84.27% optical efficiency.
11 citations