# angle of incidence

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Related to Incident angle: index of refraction, critical angle, Grazing angle

## 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.

## 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

Angle of incidence is the angle between the fuselage reference line and the wing chord.
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 ?
These experimental results confirm that the amplitude increases progressively with respect to the speed for all considered incident angles.
Organic filters are alternate options to interference filters and do not have the same sensitivity to source incident angles as interference filters do.
According to this setup, the source shoots towards RTP rays at desired incident angles and the detector compiles the output of the RR element.
For the current stage of investigation, a uniform wind velocity profile with little turbulence is required for studying the sole effect of opening sizes and wind incident angle.
It is shown that the absorptivity is kept well for a wide range of incident angles for different polarizations.
The magnitude of the reflection coefficient from this medium as a function of the incident angle is shown in Figure 3(b).
Consequently, Figure 6-Figure 8 mainly discuss the one-dimension incoherent power angle distribution changing with rain environment parameters, and the frequency, the polarization and the incident angle of the incident wave.
As for the TM wave (in Figure 4(b)), reflectance bandwidth is obvious enlarged at incident angle of 88[degrees], however, the high reflectance range of TM wave no obvious increase at incident angels of 30[degrees] and 60[degrees].
It is observed that for monostatic case, the RCS of the board is below - 18 dB with the incident angle ranging from -90[degrees] to 90[degrees], and a prominent RCS reduction is almost obtained across the whole angle range.
BASF Corporarion has received a patcnr for a color effect material comprised of a platelet-shaped substrate sequentially encapsulated with a first layer which is highly reflective to light directed thereon and which is selected from the group consisting of silver, gold, platinum, palladium, rhodium, rurhenium, osmium, iridium and alloys thereof; and a second spacer layer which does not provide significant incident angle dependent variable pathlength difference, the spacer layer is selected from the group consisting of chromium oxide, zinc oxide, zinc hydroxide, zirconium oxide, zirconium hydroxide, zirconium nitride, titanium nitride, iron hydroxide, polymethyl methacrylate, polyethylene tcrephthalate, and high density polyethylene.
To change the incident angle, it is sufficient to rotate the sample about the vertical axis that pass through the center o, while using the second degree of freedom of the sample for adjustments.
Figure 6 shows the experimental results of the ACR as a function of wind incident angle with different opening configurations.

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