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Continuation of radiant energy, particularly sound, by multiple reflection.

Related Terms

PHOTOVOLTAIC CELL

A device that detects or measures electromagnetic radiation by generating a potential at a junction (barrier layer) between two types of material, upon absorption of radiant energy. Also known as barrier-layer cell; barrier-layer photocell; boundarylayer photocell; photronic photocell.

PHOTODETECTOR

A detector that responds to radiant energy; examples include photoconductive cells, photodiodes, photoresistors, photoswitches, phototransistors, phototubes, and photovoltaic cells. Also known as lightsensitive cell; light-sensitive detector; light sensor photodevice; photodevice; photoelectric detector; photosensor.

WATER WALL

A row of water tubes lining a furnace or combustion chamber, exposed to the radiant heat of the fire.

ANGLE OF INCIDENCE

The angle between the line of motion of a ray of radiant energy and the perpendicular to a surface, at the point of impingement. This angle is numerically equal to the ANGLE OF REFLECTION.

ALBEDO

The ratio of radiant energy reflected to that received by a surface, usually expressed as a percentage; reflectivity. The term generally refers to energy within a specific frequency range, as the visible spectrum. Its most frequent application in navigation is to the light reflected by a celestial body.

ANGLE OF REFLECTION

The angle between the line of motion of a ray of reflected radiant energy and the perpendicular to a surface, at the point of reflection. This angle is numerically equal to the ANGLE OF INCIDENCE.

LUMINOUS FLUX

The quantity characteristic of radiant flux which expresses its capacity to produce a luminous sensation, evaluated according to the values of spectral luminous efficiency. Unless otherwise indi- cated, the luminous flux relates to photopic vision, and is connected with the radiant flux in accordance with the formula adopted in 1948 by the International Commission on Illumination. The derived unit of luminous flux in the International System of Units is the LUMEN.

ASTRONOMICAL REFRACTION

Atmospheric refraction of a ray of radiant energy passing through the atmosphere from outer space, as contrasted with TERRESTRIAL REFRACTION of a ray emanating from a point on or near the surface of the earth. See also REFRAC- TION.

ATMOSPHERIC ABSORPTION

The loss of power in transmission of radiant energy by dissipation in the atmosphere.

ATMOSPHERIC REFRACTION

Refraction resulting when a ray of radiant energy passes obliquely through the atmosphere. It may be called astronomical refraction if the ray enters the atmosphere from outer space, or terrestrial refraction if it emanates from a point on or near the surface of the earth.

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