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.

Detection device and detection method of off-axis parabolic mirror surface shape precision

Abstract: The invention relates to a detection device of off-axis parabolic mirror surface shape precision The detection device is composed of a Fizeau interferometer, a standard spherical mirror, an auxiliary concave spherical column, a base disc, a five-dimensional adjusting frame, a standard plane mirror, a two-dimensional adjusting frame, a supporting fixing bottom plate, a first base and a second base; the Fizeau interferometer is provided with the standard spherical mirror; the standard spherical mirror is a light beam output window of the Fizeau interferometer; the base disc is located below the Fizeau interferometer; the base disc is provided with an off-axis parabolic mirror to be detected and the auxiliary concave spherical column; the base disc is located at the top surface of the five-dimensional adjusting frame; the standard plane mirror is arranged at the bottom surface of the two-dimensional adjusting frame; and the two-dimensional adjusting frame is located above the off-axis parabolic mirror to be detected With the detection device of the off-axis parabolic mirror surface shape precision of the invention adopted, the surface shape precision of the off-axis parabolic mirror can be accurately and quickly detected

Luminaire for area lighting

Abstract: This luminaire includes an elongated generally horizontal light source, a multiple section generally parabolic reflector disposed behind the light source, and a refractor in front of the light source. The reflector includes two symmetrical transversely disposed paraboloid sections with the light source at the focus of both sections to produce essentially two spaced brams of reflected light. The area between the beams is illuminated by direct light which passes through a control lens to form a third beam. The overall effect is essentially a rectangle of light of generally uniform intensity suitable for lighting a rectangular area such as a roadway from a luminaire set back from the roadway.

Optical model and numerical simulation of the new offset type parabolic concentrator with two types of solar receivers

Abstract: The paper presents a physical and mathematical model of the new offset type parabolic concentrator and a numerical procedure for predicting its optical performances. Also presented is the process of design and optical ray tracing analysis of a low cost solar concentrator for medium temperature applications. This study develops and applies a new mathematical model for estimating the intercept factor of the solar concentrator based on its geometrical and optical behavior. The solar concentrating system consists of three offset parabolic dish reflectors and a solar thermal absorber at the focus. Two types of absorbers are discussed. One is a flat plate circular absorber and the other a spiral smooth pipe absorber. The simulation results could serve as a useful reference for design and optimization of offset parabolic concentrators.

Flexible Dual-Band Dual-Beam Radiation of Reflector Antennas by Embedding Resonant Phase Alignment Elements for Power Refocusing

Abstract: This article presents a dual-band composite reflector antenna by embedding an array of metallic phase alignment elements (PAEs) on a selected area of reflector. As a result, this phase-configurable reflector may radiate two relatively arbitrary beams at two widely separated frequency bands, respectively. In this concept, a conventional parabolic surface is first created for ordinary field radiation by a focal feed in the low-frequency band. Afterward, a feed of high-frequency band is offset from the focal point to result in defocused radiation due to the phase distortion of reflection from the parabolic reflector. Metallic PAEs are subsequently implemented on the reflector to configure their phases of reflections for distortion compensation, and thus to refocus the radiation power along a desired direction. Here, the resonance of PAEs also specifies a valid high-frequency range. In this article, the methodology is first presented with radiation discrepancy evaluated to validate the design concept, which is further validated by full-wave simulations. Numerical examples are presented to demonstrate the feasibility.