# angle of incidence

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## angle of incidence

[′aŋ·gəl əv ′in·sə·dəns]
(optics)
The angle formed by a ray arriving at a surface and the perpendicular to that surface at the point of arrival. Also known as incidence angle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## Angle of incidence

In terms of solar energy, the angle that the sun’s rays make with an imaginary line perpendicular to a surface. The angle of incidence determines the intensity of the energy that any surface experiences.

## angle of incidence Incident rays on a surface. Two ways of measuring angle of incidence.
i. The acute angle formed between the chord line of an airfoil and the longitudinal axis of the aircraft on which it is mounted. This is the angle at which the airfoil is attached to an aircraft fuselage when the aircraft is in rigging position. Unlike the angle of attack, the angle of incidence is a fixed entity.
ii. The angle at which a ray of energy impinges upon a surface, usually measured between the direction of propagation of the energy and the perpendicular to the surface at the point of impingement, or incidence. In some cases involving radio waves, the angle of incidence is measured relative to the surface.
References in periodicals archive ?
Optical characterization of coated glazings at oblique angles of incidence: Measurements versus model calculations.
Reflection Absorption Infrared Spectroscopy (RAIRS) at grazing angles of incidence, undertaken in practice typically at about 80[degrees] or greater, involves measurement of the change of reflectivity of a substrate brought about by a thin infrared absorbing layer.
As the blade pitches down from its positive extreme, the flux gradually decreases and remains low until extreme negative angles of incidence. The flux then remains high as the blade pitches back up.
(1949), Konig (1949a, 1949b), and Beyersdoffer (1949) in the late 1940s pieced together a very concrete theory of thin film morphology at both normal and oblique angles of incidence.
Rulf shows that it is possible to achieve reflection coefficients of -30 dBi over an approximate 15% frequency bandwidth for angles of incidence corresponding to the antenna looking through the nose of the radome.
The absorption rates of the triple-band MA at different angles of incidence for TE and TM waves are depicted in Figure 4.
However, for the common case of an organic film on a chromium surface in an organic medium, the sensitivity for both P end A has been calculated for various angles of incidence and film thicknesses up to 1000 A.
* High-performance acoustical ceiling systems rated from 180 to 200 in articulation class (AC), the measure of a material's ability to absorb sounds striking a ceiling at angles of incidence of 45 to 55 degrees.
The element is illuminated with a set of plane waves whose angles of incidence span the [6, 4>] space.
In Figure 7, we plot the reflectance response for 1DTSMDPC at different angles of incidence at [d.sub.def] = 120 nm, N = 5, and q = 1 for TE wave.
2(b), we use a converging beam model, comprising a set of beams with angles of incidence [phi].

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