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8 terms
Photonics Dictionary: E
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edge sensing, second derivative
Technique for the precision evaluation of coincidence of a laser beam's center with the edge of the object under study and exact location of that edge by means of a double electronic differentiation...
EDTA
ethylenediaminetetraacetic acid
electrode dark current
->
dark current
The current that flows in a photodetector when there is no optical radiation incident on the detector and operating voltages are applied.
emergent ray
In optics, the light ray leaving a medium in contrast to the entering or incident ray.
etalon
An etalon is an optical device that consists of two parallel reflecting surfaces separated by a precise and known distance. It operates based on the principle of optical interference and is used to...
etching
The engraving of a surface by acid, acid fumes or a tool; a process extensively used in the manufacture of reticles.
etching liquid
An acid used to etch the surfaces of particular materials. For glass, hydrofluoric acid is used either as a liquid or a vapor. Metals are etched by means of suitable acids or other liquids, often to...
exposure
In optics, the total radiant energy incident on a surface-per-unit area. It is equal to the integral over time of the radiant flux density. Also known as radiant exposure.
Photonics Dictionary
E
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