photoemissive device

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• Mellon optical memory — was an early form of computer memory invented at the Mellon Institute in the 1950s. The device used a combination of photoemissive and phosphorescent materials to produce a light loop between two surfaces. The presence or lack of light, detected… …   Wikipedia

• 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

• Photomultiplier — tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near infrared ranges of the electromagnetic spectrum.… …   Wikipedia

• Photoelectric effect — The photoelectric effect is a quantum electronic phenomenon in which electrons are emitted from matter after the absorption of energy from electromagnetic radiation such as x rays or visible light.cite book | title = Physics for Scientists… …   Wikipedia

• light — light1 lightful, adj. lightfully, adv. /luyt/, n., adj., lighter, lightest, v., lighted or lit, lighting. n. 1. something that makes things visible or affords illumination: All colors depend on light. 2. Physics …   Universalium

• Photocurrent — In telecommunication, photocurrent is the current that flows through a photosensitive device, such as a photodiode, as the result of exposure to radiant power. Note 1: The photocurrent may occur as a result of the photoelectric, photoemissive, or …   Wikipedia

• Optoelectronics — Not to be confused with electro optics. Optoelectronics is the study and application of electronic devices that source, detect and control light, usually considered a sub field of photonics. In this context, light often includes invisible forms… …   Wikipedia