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MORE LIGHT SOURCESLIGHT SOURCES DICTIONARY TERMS
wedge photometerA photometer that uses a wedge, marked to show its reduction of flux density, to make two light sources equal in intensity for comparison of luminous intensities. This is accomplished by the gradual insertion of the wedge before the more intense...
photodynamic therapy (PDT)A medical technology that uses lasers or other light sources in combination with photosensitizing drugs to treat cancerous...
bench photometerA device used to compare the luminous intensities of two sources by locating a point between the two light sources where the...
Lloyd's mirrorA mirror employed with a very high incidence angle to form a pair of coherent light sources by reflection, and therefore...
arc light sourceIn present usage, especially for spectroscopic identification, an arc between electrodes that serves as a radiation source....
image plane holographyA hologram in which the image of an object, or the object itself, is located near the hologram recording plane, for optimum...
fluorescent whitening agents (FWA)Agents used for testing light sources and natural daylight with visual and instrumental assessment using a set of white...
photographic photometryA form of photometric measurement, often used with light sources that are transparent or fluctuating, in which a...
photonicsThe technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The...
photobiomodulationA light therapy that utilizes nonionizing light sources, including lasers, LEDs, and broadband light, in the visible and...
quantum dotsAlso known as QDs. Nanocrystals of semiconductor materials that fluoresce when excited by external light sources, primarily...
comparison lampA reference incandescent light source having a luminous intensity that is used in photometry for comparison of other light...
free-space optics (FSO)A type of optical communications technology dealing with the use of lasers and other light sources to send telecommunication...

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