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.

Snow remover for transmission line and distribution line

Abstract: PURPOSE:To remove snow or ice from a stringing by leading light beam oscillated in a laser oscillator mounted on a mobile car to a parabolic reflector supported by a tripod and providing a control board for regulating the fulcrum spacing of the tripod based on a signal fed from an illumination monitor for measuring the distance and the angle to a transmission line. CONSTITUTION:Output beam from a CO2 gas laser 5 arranged on the bed 1a of a large truck 1 is led to the central section of a parabolic reflector 3, and an illumination point monitor 7 for measuring the angle and the distance to a stringing 6 is fixed to the reflector 3. Signal from the monitor 7 is fed to a control board 4a so as to drive a pulse motor thus telescoping a tripod and positioning the reflector 3. By such arrangement, snow or ice can be removed easily from the stringing 6.

Non-tracking solar radiation collector

Abstract: A solar collection system includes a double parabolic reflector and a light trap. The solar collection system also includes a lens configured to receive light from the double parabolic reflector and focus the reflected light into the light trap. The system may be configured to resist seismic activity and extreme weather conditions.

Catoptric lens arrangement

Abstract: A family of catoptric lens arrangements is provided for focusing a maximummount of light from an omnidirectional source into a parallel or conical beam. A rear spherical-curvature reflector is inserted into a conventional forward spherical plus rear parabolic reflector arrangement, with its center of curvature and the light source both at the focal point of the parabolic reflector. In addition, a forward collimating lens is substituted for the central portion of the forward reflector. The theoretical 100% efficiency achieved by this arrangement is independent of the diameters of the forward and rear reflectors provided, of course, that the positions and curvatures are suitably compensated.

Stacking illumination of a confocal reflector light emitting diode automobile headlamp with an asymmetric triangular prism.

Abstract: A confocal reflector lamp with an asymmetric triangular prism was designed for a stacking illumination of a light emitting diode (LED) automobile headlamp fitting ECE R112 asymmetrical regulation. The optical system includes three 1st elliptic reflectors, three 2nd parabolic reflectors, and one asymmetric triangular prism. Three elliptic and parabolic reflectors were assembled with three confocal reflector modules; two modules projected the cut-off line of a 0° angle, and the other module projected the cut-off line of a 15° angle using of an asymmetric triangular prism. The ray tracing, optical simulation, and mockup experiment results exhibited that the illumination distribution met the regulation of ECE R112 class B, and the ideal efficiency could reach 96.8% in theory. The tolerance analysis showed the efficiency remained above 98% under the error values of ±0.2 mm of the position of the LED light source, and the y direction of the up-down movement was more sensitive than the x and z directions. The measurement results of the mockup sample safety factor were all larger than 1.15 and supported the regulation of the ECE R112 Class B.

Development of an L-Band SAR Microsatellite Antenna for Earth Observation

Abstract: A compact synthetic aperture radar microsatellite antenna operating in the L-band is presented. To reduce size and weight of the small spaceborne SAR, we utilize a lightweight deployable parabolic mesh reflector and operate at low Earth orbital altitudes. The antenna is a wrap-rib center-fed parabolic reflector with dedicated receiving and transmitting feeds. Antenna requirements are: gain better than 30 dBic, center frequency of 1.275 GHz with bandwidth of 28 MHz and circular polarization with axial ratio better than 3 dB. This work describes the development of a compact Circularly Polarized SAR L-band antenna system and the design considerations suitable for small spacecrafts. Simulation of the parabolic reflector and effects of different structural elements to the main radiation pattern were analyzed, which include ribs, struts, feed blockage, and mesh surface. A research model of the parabolic reflector was constructed, and the reflector surface verification was realized using two different approaches, a laser distance meter along ribs and the other using 3D scanning of the reflector surface. RMS errors wree 1.92 mm and 3.86 mm, respectively, both below required 4.55 mm of surface accuracy. Near-field antenna measurements of the deployable reflector mesh antenna was realized for final antenna validation, presenting good agreement with the simulation results. Future work comprises prototyping and testing of the full polarimetric feed assembly.