FACTOID # 137: Sick people is Switzerland stay in hospital for longer than the people of any other nation - almost 10 days, on average. Switzerland also has the world's highest number of hospital beds per capita.
 
 Home   Encyclopedia   Statistics   Countries A-Z   Flags   Maps   Education   Forum   FAQ   About 
 
WHAT'S NEW
RECENT ARTICLES
More Recent Articles »
 

FACTS & STATISTICS    Simple view

  1. Select countries to view: (hold down Control key and click to select several)

     

     

    Compare:

     

     

  1. Select fact or statistic: (* = graphable)

     

     

     

  2. (OPTIONAL) Compare to statistic: (both need to be graphable)

     

     

     

  3. View result as:

     

       
(OR) SEARCH ALL encyclopedia, stats & forums:   

Encyclopedia > Corner reflector
Working principle of a corner reflector
Working principle of a corner reflector

A corner reflector is a retroreflector consisting of three mutually perpendicular, intersecting flat surfaces, which reflects electromagnetic waves back towards the source. The three intersecting surfaces often have square shapes. This is also known as a corner cube. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Retroreflectors are clearly visible in a pair of bicycle shoes. ... Electromagnetic radiation or EM radiation is a combination (cross product) of oscillating electric and magnetic fields perpendicular to each other, moving through space as a wave, effectively transporting energy and momentum. ...

Buoy in San Diego Harbor. Note metal plates near the top configured at right angles to reflect radar signals.
Buoy in San Diego Harbor. Note metal plates near the top configured at right angles to reflect radar signals.

Such devices are often used as radar targets or markers and are often employed on ships and, especially, lifeboats. These normally consist of three conducting metallic surfaces or screens perpendicular to one another. In optics, corner reflectors typically consist of three mirrors or reflective prisms which return an incident light beam in the opposite direction. Arrays of such retroreflectors are used in bicycle reflectors, automobile tail lights and as targets for laser range finding. Microscopic corner reflector structures can be incorporated into reflective paint for increased visibility at night, although retroreflective spherical beads are more common for this purpose. Image File history File links Download high resolution version (429x650, 57 KB)A sea lion on buoy number 14 in San Diego Bay - File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Download high resolution version (429x650, 57 KB)A sea lion on buoy number 14 in San Diego Bay - File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... For other uses, see Radar (disambiguation). ... For other uses, see Ship (disambiguation). ... For the book by Sir Isaac Newton, see Opticks. ... A mirror, reflecting a vase. ... If a shaft of light entering a prism is sufficiently narrow, a spectrum results. ... For other uses, see Light (disambiguation). ... Beam may refer to: Look up beam in Wiktionary, the free dictionary. ... For other uses, see Bicycle (disambiguation). ... Car redirects here. ... For other uses, see Laser (disambiguation). ... Retroreflectors are clearly visible in a pair of bicycle shoes. ...


A directional antenna using two mutually intersecting conducting flat surfaces is also considered to be a type of corner reflector. Log-periodic dipole array A directional antenna is an antenna which transmits or receives maximum power in a particular direction. ...

triangular corner reflector as cut of a cube
triangular corner reflector as cut of a cube

Corner reflectors can also occur accidentally. Tower blocks with balconies are often accidental corner reflectors for sound and return a distinctive echo to an observer making a sharp noise, such as a hand clap, nearby. Similarly, in radar interpretation, an object that has multiple reflections from smooth surfaces produces a radar return of greater magnitude than might be expected from the physical size of the object. A tower block, block of flats, or apartment block, is a multi-unit high-rise apartment building. ... A balcony comprising a balustrade supported at either end by plinths. ...


NASA has put a corner reflector on the Moon, for use in laser interferometry to measure the Moon's orbit more precisely than was possible before. The reflector was hand machined by Silicon Valley engineering manager Wayne Rosing, who also grinds telescope mirrors. For other uses, see NASA (disambiguation). ... This article is about Earths moon. ... Wayne Rosing is a super genius who helped develop the Apple Lisa, the forerunner to the Macintosh. ...

A corner reflector for radar testing
A corner reflector for radar testing

See also

A regular white cats eye of the kind invented by Shaw, marking the middle of the road. ... The Lunar Laser Ranging Experiment from the Apollo 11 mission The ongoing Lunar Laser Ranging Experiment measures the distance between the Earth and the Moon using laser ranging. ... Retroreflectors are clearly visible in a pair of bicycle shoes. ...

References

Federal Standard 1037C, entitled Telecommunications: Glossary of Telecommunication Terms is a United States Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. ... MIL-STD-188 is a series of U.S. military standards relating to telecommunications. ... The Department of Defense Dictionary of Military and Associated Terms is a compedium of terminology used by the United States Department of Defense (DOD). ...

  Results from FactBites:
 
Exploratorium: Science Snacks: Corner Reflector (939 words)
In a corner reflector, multiple reflections reverse the image and invert it.
Corner reflectors are used to make safety reflectors for cars, bicycles, and signs.
Corner reflectors have also been used to bounce laser beams back to the earth from the surface of the moon.
CORNER REFLECTOR ANTENNAS FOR UHF Corner Reflector Antennas (3655 words)
The corner reflector consists of a balanced half wave dipole placed in front of a conducting surface which has been bent at an angle of 90 degrees or less.
If thin sheet metal is used alone for the reflector it is wise to cut the metal 1 inch larger in width and length and use this extra material to form a folded edge around the perimeter to mechanically stiffen the reflector surface.
After the reflector is formed, cut a hole as shown and fasten the flange on the dipole assembly to the reflector as shown.
  More results at FactBites »


 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments
Please enter the 5-letter protection code

Want to know more?
Search encyclopedia, statistics and forums:

 


Lesson Plans | Student Area | Student FAQ | Reviews | Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms.