8,726 terms
Photonics Dictionary
Eberhard effectObserved phenomenon of a small developed image with higher density than a larger image because of variation in photographic plate densities with variations in size of opening.
EBESelectron-beam-exposure system
EBICelectron-beam-induced current
EBIRelectron bombardment-induced response
EBRelectron-beam recording
EBTelectron-beam tomography
ECelectrically conducting; European Commission
ECCerror correction code; electronically controlled coupling
eccentric mountingA lens mounting with eccentric rings that may be rotated to shift the axis of the lens to a prescribed position.
eccentricityIn the tolerancing of optical elements, the displacement of the optical axis from the mechanical axis.
ECDCelectrochemical diffused collector
echelette gratingA diffraction grating with lines and grooves formed so as to concentrate the radiation of a particular wavelength into one specified order. This device is efficient when used in the infrared region...
echelleA grating that serves to provide higher resolution and dispersion than the average grating, and still has a greater free spectral range than either the Fabry-Perot etalon or the reflection echelon.
echelle gratingA specialized form of diffraction grating consisting of assembled glass plates of equal thickness that resemble a flight of stairs. The light enters through the largest plate at the end and emerges...
ECLemitter-coupled logic; external cavity laser
ECMelectronic countermeasure
ECMAEuropean Computer Manufacturers' Association
ECOelectron-coupled oscillator
ECPRelectrically calibrated pyroelectric radiometer
ECRelectron cyclotron resonance
EDextralow dispersion
EDCerror detection code
EDDelectronic data display
EDFAerbium-doped fiber amplifier
edgeThe flat or angled surface, usually fine-ground, that limits the aperture of a lens or prism surface.
edge AIEdge AI, also known as edge artificial intelligence, refers to the deployment of artificial intelligence (AI) algorithms and models directly on edge devices, such as smartphones, sensors, IoT...
edge contrast -> acutanceAcutance refers to the perceived sharpness of an image in terms of the contrast of edges, rather than the resolution of fine details. It relates to how well-defined and crisp edges appear in a...
edge detectionIn image processing, the location of edges by employing templates that respond to the first or second derivative of gray-scale intensity in the neighborhood of each pixel.
edge enhancementIn image processing, any operation that strengthens information about the edges of objects displayed. Three types of spatial filtering are used: shift and difference, gradient and Laplacian.
edge filter -> bandpass filterA filter with a transmission that is high for a particular band of frequencies, but that falls to low values above and below this band.
edge followingIn image processing, a segmentation algorithm for isolating a region in an image by following its edge.
edge responseIntensity distribution in the image of an edge. The gradient of the edge-response curve is a measure of the image quality of the optical system under test.
edge sensing, second derivativeTechnique 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...
edge thickness differenceThe maximum variation in thickness of a lens as measured around a diameter centered on the optical axis. The ETD divided by that diameter yields the wedge of the lens.
edge-defined film-fed growthProcess for growth of solar cells that results in rectangular shapes consisting of many interconnected cells in a series or series-parallel arrangement. EFG cells show increased efficiency with...
edge-emitting LEDAn edge-emitting light-emitting diode is a type of LED structure where light emission occurs primarily along the edge of the semiconductor chip rather than from the surface. Edge-emitting LEDs are...
edgingThe finishing of the edge of an optical element by grinding.
EDMelectron discharge machining
EDPelectronic data processing
EDRequivalent direct radiation; effective data rate
EDTelectrodeless discharge tube
EDTAethylenediaminetetraacetic acid
EDWAerbium-doped waveguide amplifier
EDXRFenergy-dispersive x-ray fluorescence
EECEuropean Economic Community
EELSelectron-energy-loss spectroscopy
EETexcitation energy transfer
effefficiency
effect filterA color filter, generally used in photography, to emphasize certain color tones and to modify others in a picture for a more dramatic image. A blue effect filter, for example, darkens red and yellow,...
effective f numberFor a lens with an obscured or noncircular aperture, the focal length divided by the effective aperture.
Photonics Dictionary