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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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Journal ArticleDOI
TL;DR: In this paper, the authors compared the performance of simple parabolic concentrators (SPC) and compound parabolic collectors (CPC) with respect to non-direct radiation and their respective reflector arc length.

14 citations

Journal ArticleDOI
TL;DR: A new hybrid optical device that is capable of splitting a monochromatic laser beam into an arbitrary number of lines over a wide angle is presented and can be used in robot vision and other applications.
Abstract: A new hybrid optical device that is capable of splitting a monochromatic laser beam into an arbitrary number of lines over a wide angle is presented. It consists of a binary surface-relief computer-generated phase hologram and a continuous parabolic surface-relief grating. In this device the phase hologram serves to generate three small, parallel lines while the continuous parabolic surface-relief phase grating acts as an array of diverging parabolic lenses to widen these lines. The binary surface-relief was generated into one side of a quartz substrate through a plasma-etching process, and the parabolic profile was generated into a thick photoresist deposited on the other side of the quartz substrate. Calculations showed that a diverging parabolic lens with a f-number of 0.5 would deliver the desired optical pattern of multiple beams distributed over 90°. A surface-relief depth of 6.0 µm was calculated with consideration of the phase distributions of such lens. The parabolic profiles were fabricated in a 10-µm-thick photoresist, by use of a contact exposure through a mask with a space pattern of repetitive 4- and 6-µm lines. He–Ne laser light was passed through a device that generated three parallel lines over a 90° angle. The resulting diffraction patterns were characterized, and a satisfying result was obtained. The resulting multiple-line pattern can be used in robot vision and other applications.

14 citations

Journal ArticleDOI
TL;DR: In this article, a carbon fiber reinforced plastic skin-based unfurlable parabolic reflector was used in a space-borne SAR antenna to minimize the thermal distortion of the reflector in severe on-orbit thermal environments.
Abstract: To ensure high-resolution image acquisition for a spaceborne parabolic synthetic aperture radar (SAR) antenna, an appropriate thermal design is important to minimize the thermal distortion of the antenna reflector in severe on-orbit thermal environments. This paper describes the results of a preliminary thermal design and the analysis of a carbon fiber reinforced plastic skin-based unfurlable parabolic reflector for use in a spaceborne SAR antenna. The effectiveness of passive thermal designs for an antenna reflector using different thermal coatings was investigated with on-orbit thermal analyses according to the various antenna look angles to derive the most suitable design for minimizing the thermal gradient of the reflector. This contributes to minimize loss in antenna gain to ensure the SAR performance. In addition, the influence of the solar panel on the thermal gradient of the reflector was also analyzed because it is also important in affecting the thermal distortion.

13 citations

Patent
05 May 1987
TL;DR: In this article, a method for manufacturing a parabolic reflector antenna carried by an appropriate support made from an appropriate insulating material is described, which includes in combination the following steps: levelling out or smoothing the irregularities of the surface of said support by application of an appropriate levelling means, such as a lacquer or a polymer film or similar, total metallization of this surface thus levelled by metal deposition under a vacuum, forming of a mask or screen having orifices corresponding to the elements of the desired grid, interpositioning of this mask between
Abstract: A method is provided for manufacturing a parabolic reflector antenna carried by a parabolic support made from an appropriate insulating material. The method of the invention includes in combination the following steps: levelling out or smoothing the irregularities of the surface of said support by application of an appropriate levelling means, such as a lacquer or a polymer film or similar, total metallization of this surface thus levelled by metal deposition under a vacuum, forming of a mask or screen having orifices corresponding to the elements of the desired grid, interpositioning of this mask between an appropriate laser source and a focusing lens, focusing of the laser beam emitted by this source on the metallized surface of the reflector by following the contours of the orifices formed in the mask, scanning of the surface of the reflector by means of the laser beam for cutting out said grid therein, compensation of the variations of distance between the surface of the parabolic reflector and the laser source, and thus the focusing optics of the laser beam emitted thereby, during scanning of this surface.

13 citations

01 Jan 1990
TL;DR: In this paper, the authors described the development of an inflatable concentrator for solar propulsion, providing the source of heat to a hydrogen engine aboard the Solar Rocket, where two lightweight parabolic reflectors in an off-axis configuration focusing solar radiation into the absorbers of the engine caused the emission of a hot hydrogen jet.
Abstract: This paper described the development of an inflatable concentrator for solar propulsion, providing the source of heat to a hydrogen engine aboard the Solar Rocket. The device involves two lightweight parabolic reflectors in an off-axis configuration focusing solar radiation into the absorbers of the engine, which causes the emission of a hot hydrogen jet. The reflector component consists of a reflective membrane made of specially designed gores and a geometrically identical transparent canopy. The development of this system includes the analysis leading to the determination of the gore shapes, the reflector membrane design and testing, the analysis of the supporting torus, and a discussion of the effects of the space environment.

13 citations


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