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Lumencor Inc. - Power of Light 4-24 LB
irradiance Dictionary Terms

Johnson's curve
The graph of a curve describing the spectral irradiance of extraterrestrial sunlight.
beam divergence
Increase in the diameter of an initially collimated beam, as measured in milliradians (mrad) at specified points; i.e.,...
static beam shaping
A technique for creating optimal performance in a system by producing a specific beam irradiance distribution, usually...
inverse square law
The law stating that the illuminance (or irradiance) from a point source varies as the inverse square of the distance...
reflectance estimate
The output of spectral channels written as an integral function of known solar irradiance, atmospheric transmittance and...
nonlinear scattering
Direct conversion of a photon from one wavelength to a lower energy photon of another wavelength(s) due to inelastic...
time-averaged holographic interferometry
Multiple exposures of holograms, one for each position of a vibrating image, that are used for vibration analysis and that...
spectral irradiance
Irradiance per unit wavelength interval at a given wavelength, expressed in watts per unit area per unit wavelength interval.
cosine law of illumination
Law relating the illuminance (or irradiance) of a surface to the cosine of the angle, q, between the normal to the surface...
minimum spot size
The smallest linear diameter to which a laser or other beam of radiant energy is capable of being focused, depending on the...
irradiance
Radiant flux incident per unit area of a surface. Also called radiant flux density.
shading
1. The sorting of lenses by their color. 2. In an optical system, an irradiance or brightness gradient in the image that is...
reciprocity law
With respect to photography, the law stating that the optical density of an exposed emulsion with standard development is a...
noise equivalent irradiance
The amount of spatial noise detected equivalent to the output emission location of the giving source.
acoustical holography
The optical reconstruction of image information contained in a sound field. First the diffraction pattern, formed by an...
mode field diameter
For a single-mode fiber, the measurement of the irradiance distribution at the fiber's end face.
photographic exposure
The product of exposure time and irradiance or illuminance.
bidirectional reflectance distribution function
Unified notation for specification of reflectance in terms of both incident- and reflected-beam geometry; i.e., the ratio of...
solar simulator
A solar simulator is a device used to replicate the spectrum and intensity of sunlight in a controlled environment for...
scintillation
1. The variation in intensity of a light beam as it travels through the atmosphere. 2. In radiation physics, a light flash...

(20 results found)

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