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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01 Jan 1990
TL;DR: In this paper, a method was developed for predicting the radiant heat flux distribution produced by a bank of quartz radiant heaters which accounts for the specular and diffuse effects of a flat reflector or the diffuse effect of individual parabolic reflectors.
Abstract: A method is developed for predicting the radiant heat flux distribution produced by a bank of quartz radiant heaters which accounts for the specular and diffuse effects of a flat reflector or the diffuse effects of individual parabolic reflectors. This analysis is experimentally verified for a single unreflected lamp and a single lamp with a flat reflector. Observations on the further development of this analysis and experimental validation are discussed.
10 citations
TL;DR: In this paper, a four-rod solar pumping concept was proposed for the significant improvement in TEM00-mode solar laser performance, where a quadrangular pyramidal reflector was used to separate the focused solar rays from a 2.0m diameter parabolic mirror into four focal spots.
Abstract: A four-rod solar pumping concept is proposed for the significant improvement in TEM00-mode solar laser performance. A quadrangular pyramidal reflector is used to separate the focused solar rays from a 2.0-m diameter parabolic mirror into four focal spots. Four laser heads, each one consisting of a double-stage biconical lens/conical pump cavity and a small diameter Nd:YAG rod, are placed at each of the four focal zones. TEM00-mode laser output of 7.22 W is numerically obtained from each rod, resulting in 28.9 W (4 × 7.22 W) total TEM00-mode power from the four-rod scheme with 9.41 W / m2 collection efficiency. This value is 2.5 times more than that of the numerically calculated laser power collection efficiency from a single-rod pumped by the same parabolic mirror. A brightness conversion efficiency of 0.86% is achieved. Substantial improvements in TEM00-mode solar laser stability and thermal performance are also numerically demonstrated.
10 citations
TL;DR: In this paper, an analytical comparison of receiver tube diameter of an existing PTC system, considering it as a reference to another receiver tube with different diameter found out empirically, is presented.
10 citations
TL;DR: In this article, a non-contact and normal-incidence imaging system was developed to measure topographic changes along the surface of spherical samples using an asynchronous optical sampling terahertz time-domain spectroscopy setup.
Abstract: Topographical abnormality in corneal tissue is a common diagnostic marker for many eye diseases and injuries. Using an asynchronous optical sampling terahertz time-domain spectroscopy setup, we developed a non-contact and normal-incidence imaging system to measure topographic changes along the surface of spherical samples. We obtained orthogonal 1D scans of calibration spheres to evaluate the minimum axial resolution of our system. We determined the axial and spatial resolution of the scanner using 3D-printed spherical cross and Boehler star targets. Furthermore, we characterized the asymmetrical performance of the scanner due to the use of an off-axis parabolic mirror. Finally, we developed an edge-detection filter to aid with improving the topographic scans. We showed that when imaging samples were comparable in size to the human cornea, the axial and spherical spatial resolutions were limited to about 15 µm (∼λ/67) and 1 mm, respectively.
10 citations
TL;DR: In this paper, the optimal beam scanning in offset single reflector and dual reflector (Cassegrain and Gregorian) antennas is considered and an analytical, computationally efficient solution and results are presented for the optimum feed position, the constant beam direction feed loci, and the optimum position locus.
Abstract: Optimum beam scanning in offset single reflector (paraboloid) and dual reflector (Cassegrain and Gregorian) antennas is considered. Analytical, computationally efficient solutions and results are presented for the optimum feed position, the constant beam direction feed loci, and the optimum feed position locus. Examples are presented to verify that the analysis technique yields the optimum feed position, which exhibits better gain, pattern symmetry, and sidelobe levels when compared with other feed positions producing beams scanned to the same direction. The solutions described were obtained under the ray optics approximation and a "receive mode" analysis. Although the developed method was applied to the antennas listed above, it can be easily extended to other n -reflector systems, shaped reflector antennas, lenses, and other similar systems.
10 citations