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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Papers
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25 Oct 1978TL;DR: In this article, the headlight is provided with mirrors which intercept non-polarized light from the parabolic reflector and direct it through diffuser plates for near-field illumination alongside the central polarized beam.
Abstract: In order to improve the near-field illumination provided by motor vehicle headlights having a polarized light output, the headlight is provided with mirrors which intercept non-polarized light from the parabolic reflector and direct it through diffuser plates for near-field illumination alongside the central polarized beam. The rear surface of mirrors already present for bending the central polarized beams is made reflective and a second set of plane parallel mirrors is provided for bending the light reflected from the rear surfaces of the first set of mirrors back into the direction of the optical axis.
12 citations
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TL;DR: In this paper, a micro-spot x-ray tube with a multilayer optic and a 92-element parabolic compound refractive lens (CRL) made of a plastic containing only hydrogen and carbon was used for grid meshes and biological material.
Abstract: The authors present x-ray images of grid meshes and biological material obtained using a microspot x-ray tube with a multilayer optic and a 92-element parabolic compound refractive lens (CRL) made of a plastic containing only hydrogen and carbon. Images obtained using this apparatus are compared with those using an area source with a spherical lens and a spherical lens with multilayer condenser. The authors found the best image quality using the multilayer condenser with a parabolic lens, compared to images with a spherical lens and without the multilayer optics. The resolution was measured using a 155-element parabolic CRL and a multilayer condenser with the microspot tube. The experiment demonstrates about 1.1μm resolution.
12 citations
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TL;DR: In this paper, a complete design and fabrication for a distilled water apparatus using a line concentrator of parabolic reflector type, which can be used for sea water distillation, is given.
12 citations
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16 Sep 1980TL;DR: In this paper, two types of mirrors, spherical and parabolic, were studied, and the main problems encountered in the spherical mirror system are axial astigmatism and field tilt, both caused by the tilted mirrors.
Abstract: The camera viewfinder would consist of a two-element objective lens, a field stop, a tilted concave mirror, an aperture stop, a second tilted concave mirror, and a two-element eyepiece. This forms a Z shaped configuration with the mirrors at the corners of the Z. The two mirrors, with the aperture stop midway between them, form a 1:1 telescopic erecting relay system. Two types of mirrors are studied: spherical and parabolic. The main problems encountered in the spherical mirror system are axial astigmatism and field tilt, both caused by the tilted mirrors. By using confocal, coaxial, decentered parabolic mirrors, with the aperture stop at the common focal point, the axial astigmatism can be eliminated; however, the field tilt problem is aggravated. By rotating the axis of the second parabolic mirror about the common focal point, the field tilt can be minimized, and the astigmatism in all beams eliminated. This last configuration is, however, plagued by distortion and coma. We conclude that none of these systems is satisfactory for image quality.
12 citations