direct illumination

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di·rect il·lu·mi·na·tion

an illumination in which the rays of light are directed downward, almost perpendicularly onto the upper surface of the object, which reflects the rays upward into the optical system.

Synonym(s): erect illumination, vertical illumination

Farlex Partner Medical Dictionary © Farlex 2012

direct illumination

The illumination of an object under a microscope by directing light rays upon its upper surface.

See also: illumination

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References in periodicals archive ?

Direct illumination produces images that represent the flame propagation, but the images are not well developed.

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The total field strength at any point within the MWB volume will consist of both direct illumination and multi-path (reverberant) contributions.

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The perforated drop frame assembly allows light through for direct illumination, whilst the combination of the asymmetric reflectors and the curved profile of the suspended frame allows uniform sideways light distribution onto the surrounding ceiling and walls.

Future Designs

"Adjustable LED cubes provide direct illumination for accent walls, while hidden LED linear sources provide soft backlit illumination for the graphic panels," Fagnant says.

A building within a building: sculpting an hourglass-shaped lecture hall within an existing, two-level library brings new face-to-face with old at UCSD