dark field illumination

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Noun1.dark field illumination - a form of microscopic examination of living material by scattered light; specimens appear luminous against a dark background
dark ground illumination
microscopy - research with the use of microscopes
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The instruments displayed in Stuttgart in May included: a holography system able to measure extremely accurately the 3D surface topography of a part while still in the machining tool; a measurement sphere containing 27 cameras that captures a 360[degrees] view of small components in freefall, with no occlusions; and an inline system using bright field and dark field illumination to detect surface particles.
Quest for quality: Greg Blackman looks at systems presented at the recent Control trade fair for quality inspection
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