1/30/2024 0 Comments Corner reflector for saleIn aircraft navigation, corner reflectors are installed on rural runways, to make them show up on aircraft radar. Marine radar uses X-band microwaves with wavelengths of 2.5–3.75 cm (1–1.5 inches), so small reflectors less than 30 cm (12 inches) across are used. Corner reflectors are placed on the vessel's masts at a height of at least 4.6 m (15 feet) above sea level (giving them an approximate minimum horizon distance of 8 kilometers or 4.5 nautical miles). In maritime navigation they are placed on bridge abutments, buoys, ships and, especially, lifeboats, to ensure that these show up strongly on ship radar screens. The reflecting surfaces must be larger than several wavelengths of the radio waves to function. To create a corner reflector that will reflect radar waves coming from any direction, 8 corner reflectors are placed back-to-back in an octahedron (diamond) shape. These reflect radio waves coming from in front of them back parallel to the incoming beam. A simple corner reflector consists of three conducting sheet metal or screen surfaces at 90° angles to each other, attached to one another at the edges, forming a "corner". This causes them to show a strong "return" on radar screens. Radar corner reflectors are designed to reflect the microwave radio waves emitted by radar sets back toward the radar antenna. Note: The diamond-shaped corner reflector on the yacht is improperly deployed to best reflect surface radar it should be deployed in the so-called "rain-catching" configuration so as to present an inside corner as shown on the "radar testing" image. Animation showing the reflected rays in a corner of a cube (corner reflector principle). The distance travelled, relative to a plane normal to the direction of the rays, is also equal for any ray entering the reflector, regardless of the location where it first reflects. Therefore, the ray direction goes from to to to, and it leaves the corner reflector with all three components of direction exactly reversed. Similarly, when reflected from side y and finally from side z, the b and c components are reversed. When the ray reflects from the first side, say x, the ray's x component, a, is reversed to − a while the y and z components are unchanged, resulting in a direction of. To see this, the three corresponding normal vectors of the corner's perpendicular sides can be considered to form a basis (a rectangular coordinate system) ( x, y, z) in which to represent the direction of an arbitrary incoming ray. The incoming ray is reflected three times, once by each surface, which results in a reversal of direction. Principle Working principle of a corner reflector Optical corner reflectors, called corner cubes or cube corners, made of three-sided glass prisms, are used in surveying and laser ranging. Radar corner reflectors made of metal are used to reflect radio waves from radar sets. The three intersecting surfaces often have square shapes. A corner reflector for radar testingĪ corner reflector is a retroreflector consisting of three mutually perpendicular, intersecting flat surfaces, which reflects waves directly towards the source, but translated. Not to be confused with Corner reflector antenna.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |