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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
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ReportDOI
01 Aug 1987
TL;DR: In this article, the formation of optical reflector surfaces, using initially flat circular membranes with uniform pressure loading, is studied, and the structural/optical response mechanisms that lead to optical distortions relative to ideal parabolic reflector shapes are also considered.
Abstract: Potentially high quality optical reflector surfaces are attainable with the use of pressure formed membranes. Such reflector surfaces offer the prospect of very low weight and low cost. The formation of such surfaces, using initially flat circular membranes with uniform pressure loading, is studied in this paper. Finite axisymmetric deformations, along with both linear and nonlinear material response is considered. A wide range of focal-length-to-diameter ratios (above 0.6) are addressed and the structural/optical response mechanisms that lead to optical distortions relative to ideal parabolic reflector shapes are also considered. Results show that elastic material response can often lead to a significantly larger deviation from the ideal shape than will inelastic material response. This results primarily from the ability to limit stress nonuniformities when inelastic material response is operative. Furthermore, when under pressure loading the membrane focal length decreases monotonically with increasing radius for both linear and nonlinear material response. Further, the predicted focal length variation is increasingly nonlinear near the membrane support.

11 citations

Patent
05 Mar 2012
TL;DR: In this article, a light-emitting device is provided with a laser light source, wiring, and at least one among an excitation lens (2), a light emitting body (4), a laser cut-off filter (6), a half parabolic mirror (5P), and a base (5h).
Abstract: A light-emitting device is provided with a laser light source (1), wiring (9), and at least one among an excitation lens (2), a light-emitting body (4), a laser cut-off filter (6), a half parabolic mirror (5P), and a base (5h). A part of the wiring (9) is disposed at a point where a wire break can easily occur as a result of a change in the installation position or the shape of at least one among the laser light source (1), the excitation lens (2), the light-emitting body (4), the laser cut-off filter (6), the half parabolic mirror (5P), and the base (5h).

11 citations

Patent
18 Apr 2003
TL;DR: An infrared welder for thermoplastic materials comprising the combination of a halogen lamp producing illumination in the infrared band located at the focal point of a first parabolic reflector is described in this article.
Abstract: An infrared welder for thermoplastic materials comprising the combination of a halogen lamp producing illumination in the infrared band located at the focal point of a first parabolic reflector. The parabolic reflector is joined in a substantially continuous fashion with a non-imaging lower reflector such as a Winston cone or a “CPC” having a lower aperture through which essentially all of the radiation from the source is directed. The aperture defines the shape and size of the weld area. The lower reflector may be brought into contact with the thermoplastic materials during the welding operation. Alternatively, a selectively operable press device may be used. Several embodiments are disclosed including embodiments which produce circular spot welds, linear welds, curved welds and corner welds.

11 citations

Patent
17 Nov 2000
TL;DR: In this paper, a Littrow-type spectrometer or monochromator using a folded light path to provide a compact optical instrument is disclosed, where light entering the instrument through an inlet aperture on a planar mirror.
Abstract: A Littrow-type spectrometer or monochromator using a folded light path to provide a compact optical instrument is disclosed. Light enters the instrument through an inlet aperture on a planar mirror. The aperture is located at the focus of a parabolic collimator mirror. Collimated light reflected by the parabolic mirror is reflected back to the planar mirror, which is positioned at an angle to the collimated light. The light reflected from the planar mirror is directed at a planar grating that produces diffracted light having all the wavelengths input into the system, including light of a selected wavelength, back towards the planar mirror. Light having the selected wavelength is thus caused to fall on the parabolic mirror. The parabolic mirror then focuses the selected wavelength of light onto a light exit aperture that is juxtaposed to the inlet light aperture. The planar grating can be rotatably mounted to scan the input light spectrum.

11 citations

Proceedings ArticleDOI
16 Jul 2000
TL;DR: In this paper, the characterization and design of 30 GHz two-lens and lens-fed reflector antenna systems is presented, where a hyperhemispherical substrate lens feeds either a larger but thin hyperbolic lens or a parabolic reflector.
Abstract: In this paper, the characterization and design of 30 GHz two-lens and lens-fed reflector antenna systems is presented. In this approach, a hyperhemispherical substrate lens feeds either a larger but thin hyperbolic lens or a parabolic reflector. The attractive feature of these two-antenna systems is that it leads to a 75% reduction of the lens material, while maintaining about the same length and on-axis characteristics as the single lens antenna. In these two-antenna systems, limited scan capability is possible which can lead to relaxed alignment requirements between a receiver and a transmitter for line-of-sight broadband wireless links.

11 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202338
202286
202168
202098
2019136
2018128