Parabolic Reflector

A parabolic reflector (or dish or mirror) is a reflective device used to collect or project energy such as light, sound, or radio waves. Its shape is that of a circular paraboloid, that is, the surface generated by a parabola revolving around its axis. The parabolic reflector transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Conversely, a spherical wave generated by a point source placed in the focus is transformed into a plane wave propagating as a collimated beam along the axis.

Parabolic reflectors are used to collect energy from a distant source (for example sound waves or incoming star light) and bring it to a common focal point, thus correcting spherical aberration found in simpler spherical reflectors. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.

Read more about Parabolic ReflectorTheory, History, Applications

Other articles related to "parabolic reflector, parabolic, reflectors, reflector, parabolic reflectors":

Parabolic Reflector - Applications
... The most common modern applications of the parabolic reflector are in satellite dishes, reflecting telescopes, radio telescopes, parabolic microphones, solar cookers ... lit at Olympia, Greece, using a parabolic reflector concentrating sunlight, and is then transported to the venue of the Games ... Parabolic mirrors are one of many shapes for a burning-glass ...
Beam Projector
... It uses two reflectors ... The primary reflector is a parabolic reflector and the secondary reflector is a spherical reflector ... The parabolic reflector organizes the light into nearly parallel beams, and the spherical reflector is placed in front of the lamp to reflect light from the lamp back to the parabolic reflector, which reduces spill ...
Radar - Engineering - Antenna Design - Parabolic Reflector
... More modern systems use a steerable parabolic "dish" to create a tight broadcast beam, typically using the same dish as the receiver ... Parabolic reflectors can be either symmetric parabolas or spoiled parabolas Symmetric parabolic antennas produce a narrow "pencil" beam in both the X and Y ... Spoiled parabolic antennas produce a narrow beam in one dimension and a relatively wide beam in the other ...
Parabolic Antenna - History
... The idea of using parabolic reflectors for radio antennas was taken from optics, where the power of a parabolic mirror to focus light into a beam has been known ... The designs of some specific types of parabolic antenna, such as the Cassegrain and Gregorian, come from similarly named analogous types of reflecting telescope, which were ... Heinrich Hertz constructed the world's first parabolic reflector antenna in 1888 ...
Stage Lighting Instrument - Types - Spotlights - Beam Projector
... It uses two reflectors ... The primary reflector is a parabolic reflector and the secondary reflector is a spherical reflector ... The parabolic reflector directs the light into nearly parallel beams, and the spherical reflector is placed in front of the lamp to reflect light from the lamp back to the ...