dark-field illumination


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dark-field illumination

[′därk ‚fēld ə‚lüm·ə′nā·shən]
(optics)
A method of microscope illumination in which the illuminating beam is a hollow cone of light formed by an opaque stop at the center of the condenser large enough to prevent direct light from entering the objective; the specimen is placed at the concentration of the light cone, and is seen with light scattered or diffracted by it.
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References in periodicals archive ?
Dark-field illumination results in most of the light falling outside of a camera's field of view (FOV).
In other words, oblique illumination covers every lighting possibility between bright-field and dark-field illumination.
When coupled with Rudolph's proprietary laser dark-field illumination, the NSX is able to detect nodule and crater defects that are critical in the manufacture of gold bumps.