discharge detector

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• Discharge ionization detector — A discharge ionization detector (DID) is a type of detector used in gas chromatography. Principle A DID is an ion detector which uses a high voltage electric discharge to produce ions. The spark ionizes helium atoms that are mixed with components …   Wikipedia

• Gas chromatography ion detector — Many GC detectors are ion detectors with varying methods of ionizing the components eluting from the GC s column.Principle of OperationAn ion detector is analogous to a capacitor or vacuum tube. It can be envisioned as two metal grids separated… …   Wikipedia

• Magnetic detector — 1902 1918: Marconi s Wireless Magnetic Detector (London) The magnetic detector was one of the first practical devices able to make radio signals audible through a pair of headphones. It was not as sensitive as some detectors but despite that, it… …   Wikipedia

• Smoke detector — A smoke detector is a device that detects smoke, typically as an indicator of fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as smoke alarms, generally issue a… …   Wikipedia

• Helium ionization detector — A helium ionization detector (HID) is a type of detector used in gas chromatography. PrincipleAn HID is an ion detector which uses a radioactive source to produce ions. The radioactive source ionizes helium atoms by bombarding them with emissions …   Wikipedia

• PDD (disambiguation) — PDD is an abbreviation for pervasive developmental disorder. PDD may also refer to: P. Diddy Partnership for Democracy and Development in Central America Pas de deux, a type of ballet dance PDD (2,2 bis trifluoromethyl 1 4,5 difluoro 1,3 dioxole) …   Wikipedia

• PDD — may refer to: *Partnership for Democracy and Development in Central America *Percent Depth Dose, in radiation therapy *Pervasive developmental disorder *Photodynamic Disinfection *Physical device driver, see device driver *Pinky Dinky Doo *An… …   Wikipedia

• PDD — steht für: Partei Deutscher Demokraten, eine ehemalige Partei in Bayern Partido dei Democratici, eine ehemalige Partei in San Marino Pervasive Developmental Disorder, siehe Tiefgreifende Entwicklungsstörung Platform Dependent Driver, nach dem MDD …   Deutsch Wikipedia

• Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …   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

• Lightning — This article is about the atmospheric electrical phenomenon. For other uses, see Lightning (disambiguation). See also: Lightning strike Lightning striking Atlanta, United States Lightning is an atmospheric electrostatic discharge (spar …   Wikipedia