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.

Luminaire having variable light distribution

Abstract: In a luminaire having a height-adjustable elongated light source (1) and a parabolic reflector which interacts therewith and consists of two shell-shaped reflector halves (2, 3) which can respectively be swivelled about a lower axis of rotation, a slatted louvre (9, 15) is provided whose transverse slats (9) engage with their ends (10) in the reflector halves (2 and 3) through enlarged cutouts (11) and are mounted on retaining rails (15) which extend along the outsides of the reflector halves.

Optical radio transmitter-receiver and optical radio equipment and optical axis adjusting method for the equipment

Abstract: PURPOSE:To prevent interference to realize long distance transmission even at the time of using plural systems using an LED in parallel, to directly transmit a signal such as a Manchester code by radio, and to provide an effective and convenient optical axis adjusting method CONSTITUTION:An LED 12 is arranged at the focus position of a parabola reflector 11 of a transmitter 10 or the neighborhood of the focusing position, and the outgoing light of the LED 12 is reflected by the reflecting surface of the paradolic reflector 11 so as to be a parallel light A pin photodiode 22 is arranged at the focus position of a parabolic reflector 21 of a receiver 20, and the light reflected by the parabola reflector 21 is converged to the focus position, and received by the pin photodiode 22 Also, an optical axis is adjusted by using an optical level detector, light emitter or light receiver whose directivity is wider than the transmitter 10 or the receiver 20, and constitution in which the two parabolic reflectors for transmission and reception are integrated or the like

Method and device for two-stage solar concentration and spectrum splitting based on dish concentration

Abstract: The present invention discloses a method and device for two-stage solar concentration and a spectrum splitting dish reflector based on dish concentration. A parabolic dish reflector is provided with a central light hole. A CPV panel and a solar-to-heat receiver are positioned at the two sides of the axial line of dish reflector, respectively, under the light hole. A splitting lens is placed at a certain distance from the apex of dish reflector over the light hole. The splitting film is applied to the curved surface of the lens near the parabolic dish, as a spectrum splitting surface. The curved surface of the lens far from the parabolic dish is covered by silver, as a reflecting surface. A supporting structure is provided between the dish reflector and the splitting lens. The whole system with a dual-axis tracking system is placed on the foundation of a support. The present invention can simultaneously realize solar energy concentration and spectrum splitting, to obtain two concentrated spots of different spectrums under the system, which can effectively reduce energy consumption of tracking system and improve system balance and wind resistance. The present invention can adjust the concentration ratio of two beams individually to satisfy the optimal concentrating intensity needed by the CPV panel and the solar-to-heat receiver.

Very small aperture terminal and antenna for use therein

Abstract: A data transmitting/receiving satellite terminal for transmitting to and receiving from a geosynchronous satellite (11) employs an antenna (15A, 15B) having nulls in its antenna receiving pattern at a first frequency corresponding to satellites spaced at regular intervals from the satellite. In addition, a phase and amplitude compensation network (23A, 23B) adjusts a phase and amplitude of the transmitted signal to compensate for transmitting at a different frequency than for which the antenna is optimally designed. The antenna includes a main parabolic reflector, and two side parabolic reflectors offset from a plane parallel to the main parabolic reflector. Each of the reflectors uses a dual frequency feed horn to couple energy to and from the reflector to a dipole exciter to which the receiving electronics are coupled. The above terminal is particularly useful in C-Band applications.

Exact sampling approach for reflector antennas analysis

Abstract: A new method for computing the far field of a possibly shaped or deformed reflector antenna based on a sampling representation of the radiation integral is presented. Using a projection technique the required samples can be efficiently computed using a two-dimensional fast Fourier transform (FFT), whereas the radiated field is reconstructed via standard sampling expansion. Numerical examples and computation time analysis are reported showing the effectiveness of the approach particularly for deformed reflectors and/or plane-cut field evaluation.