Photonics Dictionary Definitions, Abbreviations, Illustrations, Terms listing by the letter V (Items 1 thru 40)

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Photonics Dictionary Return to Dictionary home There are 109 terms that begin with 'V' Currently displaying records 1 thru 40. You are in set 1 of 3 next set —> or select a set: 1 vacancy In an ionic crystal, the region in the crystal lattice... 2 vacuum apparatus Equipment dependent on the effects of a vacuum. The... 3 vacuum breaker A valve that serves to release air into an evacuated... 4 vacuum etching Also known as cathodic etching. Surface etching achieved by... 5 vacuum gauge A gauge designed to measure the degree of vacuum in an... 6 vacuum phototube A phototube that functions within a vacuum and thus... 7 vacuum spectrograph A spectrograph that functions in a vacuum and therefore... 8 vacuum spectrography The technique of producing spectrograms in wavelengths... 9 vacuum ultraviolet (VUV) radiation Radiation whose spectrum runs between 100 and 300 nm. Any... 10 vacuum ultraviolet detector A device that serves to detect the presence of vacuum... 11 vacuum ultraviolet source Any source that emits radiation of wavelengths between 100... 12 vacuum ultraviolet spectroscopy A method of spectral analysis using wavelengths between 100... 13 valence band In a crystalline substance, the spectral range of states of... 14 valence crystal A crystal that is held together by covalent... 15 van der Waals forces The attraction between atoms or molecules caused by dipole... 16 vanadate laser Lasers based on neodymium-doped yttrium or gadolinium... 17 vapor degreasing A method of cleaning and drying coated optical components.... 18 vapor-phase axial deposition (VAD) A process by which high-quality fiber optics are made. See... 19 vapor-phase epitaxy (VPE) See... 20 vapor-phase oxidation See inside vapor-phase oxidation; outside vapor-phase... 21 varactor A semiconductor diode that exhibits change in capacitance... 22 variable-focus condenser An Abbe condenser in which the upper lens element is fixed.... 23 variable-focus lens A lens assembly containing several movable elements to... 24 variable-speed scanning A scanning technique in which the optical density of the... 25 varifocal See variable-focus... 26 v-coat A multilayer antireflective thin-film coating, so called... 27 vector correlation A machine vision technique of image correlation whereby the... 28 Vegard-Kaplan bands The bands found by Vegard in the spectrum of the aurora... 29 veiling brightness A brightness, superimposed on the image of the retina, that... 30 veiling glare Diffuse stray light at the image plane of an optical system... 31 velocimeter See laser Doppler velocimeter; laser... 32 velocity modulation laser spectroscopy A method of measuring negatively charged phase ions using a... 33 venetian-blind effect Short-distance scattering of light in holography caused by... 34 Verdet constant A factor of an equation of the Faraday effect, which is the... 35 vergence The angular relation between two light rays that originated... 36 vernier acuity The degree to which a pair of fine lines can be aligned to... 37 vernier interferometer A phase-shift interferometer used to detect the relative... 38 vertex The point of intersection of the optical axis with any... 39 vertex power The reciprocal of the back focal distance of a spectacle... 40 vertical air photograph An aerial photograph produced when the optical axis of the... Currently displaying records 1 thru 40. You are in set 1 of 3 next set —> or select a set: Return to Dictionary home Click to view listings of terms Term of the moment... eye test apparatus - Instruments used by ophthalmologists and optometrists to study the eye. There are, for instance, the ophthalmoscope to observe and photograph the retina; the retinoscope and optometer to determine the refractive errors of the eye; the ophthalmometer (keratometer) to measure the radius of curvature of the cornea; the slit lamp and corneal microscope to examine the cornea itself; the perimeter (campimeter) to plot out blind areas on the retina; and various forms of stereoscopes used extensively to study vision and to exercise the eye muscles. See also color perception test equipment.	advertisement advertisement advertisement advertisement advertisement advertisement advertisement

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