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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Proceedings Article•
NEC1
TL;DR: In this article, a parabolic reflector with a circular array (CA) feed was used to generate OAM in the mm-wave bands, and the design parameters were numerically optimized for both the reflector and the CA in terms of beam divergence associated with different OAM modes.
Abstract: This paper discusses the generation of orbital angular momentum (OAM) produced by a parabolic reflector with a circular array (CA) feed. Simulated electromagnetic (EM) field verifies the behavior of OAM. Design parameters are numerically optimized for both the parabolic reflector and the circular array feed, in term of beam divergence associated with different OAM modes. Primitive estimations suggest that a few low-order-OAM modes can be transmitted simultaneously up to 100 meters in the mm-wave bands.
10 citations
TL;DR: In this article, the spatial distribution of the polarization state of a terahertz electromagnetic wave focused by an off-axis parabolic mirror (OPM) in the focal plane was investigated.
Abstract: We have investigated the spatial distribution of the polarization state of a terahertz electromagnetic wave focused by an off-axis parabolic mirror (OPM) in the focal plane. We employed polarization-resolved terahertz time-domain spectroscopy and found that a steep spatial variation in the polarization state appears slightly distant from the focus when a linearly polarized terahertz wave is focused. The spatial variation includes an abrupt change in the polarization state (states change between circular and linear polarizations) within a wavelength. The observed phenomena are confirmed by numerical calculations and are shown to be intrinsic to the reflection from the OPM.
10 citations
26 Sep 2014
TL;DR: In this paper, a compact high concentrating photovoltaic (HCPV) module based on cassegrain optics is proposed; consisting of a primary parabolic reflector, secondary reflector and homogeniser.
Abstract: A compact high concentrating photovoltaic (HCPV) module based on cassegrain optics is proposed; consisting of a primary parabolic reflector, secondary reflector and homogeniser. The effect of parabolic curvatures, reflector separation distance and the homogeniser’s height and width on the tracking tolerance has been investigated for optimisation. In this type of HCPV, the addition of a solid transparent homogeniser to the two stage reflector design greatly improves the tracking tolerance. Optical simulation studies show high optical efficiencies of 84.82 – 81.89 % over a range of ±1 degree tracking error and 55.49% at a tracking error of ±1.5 degrees.
10 citations
Patent•
11 Sep 2000
TL;DR: In this article, the reflector is made by forming a series of layers (12, 14, 16, 18, and 20 ) that are progressively thinner with the final polymeric layer (20 ) being about one millimeter in thickness.
Abstract: A method for making polymeric reflectors and parabolic reflectors in particular. The reflector is made by forming a series of layers ( 12, 14, 16, 18, and 20 ) that are progressively thinner with the final polymeric layer ( 20 ) being about one millimeter in thickness. The reflector is then coated with a reflective layer ( 22 ) by vapor deposition. To make a parabolic reflector, the layers are spun cast at a constant, preselected rate throughout the process, including during the curing of each layer. Layer formation is made in a controlled, particulate-free environment and additives can be used to increase stiffness, decrease weight, and reduce stresses during curing.
10 citations
Patent•
07 Aug 2008
TL;DR: In this article, a handheld searchlight for producing a high intensity beam of light output has an elongated housing including a handle portion for gripping by a user and a head with a window opening for transmitting a light beam.
Abstract: A handheld searchlight for producing a high intensity beam of light output has an elongated housing including a handle portion for gripping by a user. A head has a window opening for transmitting a light beam. There is a mechanical coupling between the housing and the head. A parabolic reflector is mounted in the head facing the window and has an aperture for accommodating a high intensity lamp. The reflector has a longitudinal optical axis. The rotation of the head about the coupling causes movement of the parabolic reflector relative to the lamp along the optical axis thereby changing a spread of the high-intensity light beam. The searchlight further includes a rotatable bezel ring mounted on the head and a filter ring mount connected to the rotatable bezel. An optical filter is mounted in the filter ring mount.
10 citations