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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No references found			It has been suggested that Leeuwenhoek might have used some simple means of dark-field illumination to visualize details such as flagella on bacteria. Antony van Leeuwenhoek. (A Portrait in History) by Jay, Venita / Archives of Pathology & Laboratory Medicine 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. Rudolph Now Offers Complete Solution for 200 and 300 mm Gold Bump ... by Business Wire			dark box dark cloud dark conduction Dark Continent dark current dark discharge dark energy dark fiber dark horse Dark Lady, The dark laser dark lightning dark matter dark nebula dark of the moon dark plaster dark resistance dark satellite dark segment dark space dark spot dark star Dark, Eleanor dark-current pulse dark-eclipsing variables dark-field illumination dark-line spectrum dark-red silver ore dark-ruby silver dark-side hacker dark-trace tube Darke County darkened datacenter Darkening Darkest Africa Darkling Beetles darkness Darkness at Noon Darkness, Prince of darknet Darkon darkroom darkroom filter Darkshevich, Liverii Darkshevich, Liverii Osipovich Darkul Kuiukova Darlan Darlan, François Darlan, Jean François Darlan, Jean Louis Xavier Francois Darlan, Jean Louis Xavier François			Dark Warriors of Earth Dark Water Dark Web Attribute System Dark winged fungus gnat Dark Winter Dark Wizard Dark Zen Meditation Dark Zone Dark, Eleanor Dark, Firm and Dry dark-adapt dark-adapt dark-adapted dark-adapted dark-adapted eye Dark-bellied Brent Goose dark-blue dark-brown dark-coated dark-colored dark-coloured dark-current pulse dark-eclipsing variables Dark-eyed dark-eyed junco dark-eyed junco dark-eyed junco dark-eyed juncos dark-eyed juncos dark-field illumination dark-field microscope dark-field microscope dark-field microscope dark-film fault dark-fruited dark-gray dark-green dark-grey dark-ground illumination dark-ground illumination dark-ground illumination dark-ground illumination dark-haired Dark-horse Dark-horse Dark-Interval Relaxation Kinetic Analysis Dark-line spectrum Dark-line spectrum Dark-line spectrum Dark-mantled Sooty Albatross dark-red silver ore dark-ruby silver Dark-side hacker Dark-side hacker dark-skinned dark-spotted dark-trace tube Dark-winged fungus gnat Darkage Darkage

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