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Radian

A unit of angular measure equal to the angle subtended at the centre of a circle by a chord whose length is equal to the radius of the circle.

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radian
Weather; Meteorology

A unit of angular measure; one radian is that angle with an intercepted arc on a circle equal in length to the radius of the circle. Thus, π radians equals 180°. See'' also'' ...

radian
Aerospace; Satellites

A unit of angle subtended by an arc of a circle equal in length to the radius of the circle.

radian
Physics; General physics

A unit for measuring angles; also called a “rad.” 2π rad = 360º.

radian
Earth science; Remote sensing

Nagle subtended by an arc of a circle equal in length to the radius of the circle 1 rad = 57. 3¡.

radian
Aerospace; Space flight

Unit of angular measurement equal to the angle at the center of a circle subtended by an arc equal in length to the radius. Equals about 57.296 degrees.

Absorb
Industrial machinery; Laser equipment

To transform radiant energy into a different form accompanied by a rise in temperature.

Absorption Coefficient
Industrial machinery; Laser equipment

Factor describing light's ability to be absorbed per unit of path length.

Accessible Emission
Industrial machinery; Laser equipment

The magnitude of accessible laser (or other collateral) radiation of a specific wavelength or emission duration at a particular point as measured by appropriate methods and ...

Accessible Emission Limit
Industrial machinery; Laser equipment

The maximum accessible emission level limit (AEL) permitted within a particular class. In ANSI Z-136.1, AEL is determined as the product of Accessible Emission times the Maximum ...

Active Medium
Industrial machinery; Laser equipment

Collection of atoms or molecules capable of undergoing stimulated emission at a given wavelength.

Afocal
Industrial machinery; Laser equipment

Literally, "without a focal length"; an optical system with its object and image point at infinity.

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