photoelectric instruments

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• optical instruments — (New American Roget s College Thesaurus) Devices for modifying vision Nouns 1. optical instruments, [plano convex or concave, biconvex, converging or diverging miniscus, or biconcave] lens, achromatic lens; spectacles, glasses, bifocals, pince… …   English dictionary for students

• electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… …   Universalium

• spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …   Universalium

• radiation measurement — ▪ technology Introduction       technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for the purpose of measurement.       The term ionizing radiation refers to those… …   Universalium

• radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

• Scintillator — Scintillation crystal surrounded by various scintillation detector assemblies …   Wikipedia

• Pressure measurement — The construction of a bourdon tube gauge, construction elements are made of brass Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called pressure gauges or vacuum gauges. A… …   Wikipedia

• University of Illinois Observatory — Infobox nrhp | name = University of Illinois Astronomical Observatory nrhp type=nhl caption = The observatory at U of I is a National Historic Landmark. locator x = locator y = location = Urbana, Illinois, Champaign County, Illinois, USA nearest… …   Wikipedia

• Optics — For the book by Sir Isaac Newton, see Opticks. Optical redirects here. For the musical artist, see Optical (artist). Optics includes study of dispersion of light. Optics is the branch of …   Wikipedia

• Planck constant — Planck s relation redirects here. For the law governing black body radiation, see Planck s law. Values of h Units 6.62606957(29)×10−34 J·s[1] 4.135 …   Wikipedia

• Optigan — Keyboard overview of a model 35002 Optigan. The coded strip above the main keyboard corresponded to numbers in the music books for those unable to read music. The Optigan (a portmanteau of Optical Organ) was an electronic keyboard instrument… …   Wikipedia