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.
Papers published on a yearly basis
Papers
More filters
Patent•
28 Nov 2007
TL;DR: In this article, a multi-reflector mechanism for a LED light source was proposed, where the inner reflector is disposed within the outer reflector with the focuses of both reflectors being different points on a common axis.
Abstract: A multi-reflector mechanism for a LED light source which comprises a LED light source, an outer parabolic reflector, an inner parabolic reflector and a sliding switch, wherein the inner reflector is disposed within the outer reflector with the focuses of both reflectors being different points on a common axis, and the focus of the outer reflector being the highest one nearest to the plane of the opening of the outer reflector; and the LED light source is disposed within the inner reflector and protrudes out from the vertex of the inner reflector and is coaxially and adjustably disposed at or near the focus of the inner reflector or of the outer reflector, and the light emitting angle of the LED light source is larger than the angle formed by the two points on the edge of the opening forming the diameter thereof and the focus of the inner reflector. The present invention can emit a bright, sharp and wide spot of light at a shorter distance and, as an alternative by means of a sliding switch, a bright, sharp and small spot of light at a farther distance.
15 citations
TL;DR: The performance of a new type of solar still, used for producing drinking water in remote areas, has been investigated in this paper, where a metallic cylindrical parabolic reflector was designed to concentrate incident solar radiation on the black outside surface of a tray located on the focal line of the reflector.
15 citations
TL;DR: An optical design for a new white LED motorcycle headlamp that allows the device to meet the Economic Commission of Europe, regulation no. 113 (ECE R113) and good uniformity is obtained by using aspherical surface optimization of the same toric lens.
Abstract: An optical design for a new white LED motorcycle headlamp is presented. The motorcycle headlamp designed in this study comprises a white LED module, an elliptical reflector, a parabolic reflector, and a toric lens. The light emitted from the white LED module is located at the first focal point of the elliptical reflector and focuses on the second focal point. The second focal point of the elliptical reflector and the focal point of the parabolic reflector are confocal. We use nonsequential rays to improve the optical efficiency of the compound reflectors. The toric spherical lens allows the device to meet the Economic Commission of Europe, regulation no. 113 (ECE R113). Furthermore, good uniformity is obtained by using aspherical surface optimization of the same toric lens. The reflectivity of the reflector is 95%, and the transmittance of each lens surface is 98%. The average deviation of the high beam is 14.17%, and the optical efficiency is 66.45%.
15 citations
TL;DR: In this paper, a phase-steered linear array feed for a parabolic cylindrical reflector antenna is considered and the nearly cylinear wave radiated from this line feed in the Fresnel zone is expressed in terms of the isolated-element pattern.
Abstract: A phase-steered linear array feed for a parabolic cylindrical reflector antenna is considered. The nearly cylindrical wave radiated from this line feed in the Fresnel zone is expressed in terms of the isolated-element pattern. The correction to this wave due to diffraction from the endpoints of the line feed and from the grating formed by the array elements is also derived.
15 citations
TL;DR: In this paper, the point-source angular response and the throughput from a distributed incoherent source of an absorbing mesh in the focal plane of a quasi-optical component (e.g., a parabolic reflector or lens) were analyzed using Fourier Optics.
Abstract: Passive imaging cameras at millimeter and sub-millimeter wavelengths are currently entering a new era with the development of large format arrays of direct detectors. Several of these arrays are being developed with bare absorbing meshes without any antenna coupling (lens or horn) structures. The design of such arrays is typically done resorting to geometrical considerations or basic broadside plane wave incidence analysis. This paper presents a spectral technique for the analysis of such focal plane arrays in reception using Fourier Optics, which is valid also for moderately skewed incident angles. The analysis constitutes a step improvement with respect to previously used methods by providing an accurate and efficient way to estimate the point-source angular response and the throughput from a distributed incoherent source of an absorbing mesh in the focal plane of a quasi-optical component (e.g., a parabolic reflector or lens). The proposed technique is validated with full-wave simulations. After presenting the analysis, this paper compares the performance of arrays of bare absorber in the focal plane of a quasi-optical component to those of corresponding antenna based arrays. It is found that absorbers lead to a comparable tradeoff, in terms of spill-over and focusing efficiency, only for very tight samplings. For larger samplings, the focusing efficiency of absorbers is significantly lower than the one for antennas.
15 citations