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- Everhart-Thornley_detector abstract "The Everhart-Thornley Detector (E-T detector or ET detector) is a secondary electron and back-scattered electron detector used in scanning electron microscopes (SEMs). It is named after its designers, Thomas E. Everhart and Richard F. M. Thornley who in 1960 published their design to increase the efficiency of existing secondary electron detectors by adding a light pipe to carry the photon signal from the scintillator inside the evacuated specimen chamber of the SEM to the photomultiplier outside the chamber. Prior to this Everhart had improved a design for a secondary electron detection by Vladimir Zworykin and J. A. Rajchman by changing the electron multiplier to a photomultiplier. The Everhart-Thornley Detector with its lightguide and highly efficient photomultiplier is the most frequently used detector in SEMs. The detector consists primarily of a scintillator inside a Faraday cage inside the specimen chamber of the microscope. A low positive voltage is applied to the Faraday cage to attract the relatively low energy (less than 50 eV by definition) secondary electrons. Other electrons within the specimen chamber are not attracted by this low voltage and will only reach the detector if their direction of travel takes them to it. The scintillator has a high positive voltage (in the nature of 10,000 eV) to accelerate the incoming electrons to it where they can be converted to light photons. The direction of their travel is focused to the lightguide by a metal coating on the scintillator acting as a mirror. In the light pipe the photons travel outside of the microscope's vacuum chamber to a photomultiplier tube for amplification.The E-T secondary electron detector can be used in the SEM's back-scattered electron mode by either turning off the Faraday cage or by applying a negative voltage to the Faraday cage. However, better back-scattered electron images come from dedicated BSE detectors rather than from using the E-T detector as a BSE detector.".
- Everhart-Thornley_detector wikiPageID "3070387".
- Everhart-Thornley_detector wikiPageLength "2521".
- Everhart-Thornley_detector wikiPageOutDegree "14".
- Everhart-Thornley_detector wikiPageRevisionID "610496905".
- Everhart-Thornley_detector wikiPageWikiLink Backscatter.
- Everhart-Thornley_detector wikiPageWikiLink Category:Microscopes.
- Everhart-Thornley_detector wikiPageWikiLink Electronvolt.
- Everhart-Thornley_detector wikiPageWikiLink Faraday_cage.
- Everhart-Thornley_detector wikiPageWikiLink J._A._Rajchman.
- Everhart-Thornley_detector wikiPageWikiLink Photomultiplier.
- Everhart-Thornley_detector wikiPageWikiLink Richard_F._M._Thornley.
- Everhart-Thornley_detector wikiPageWikiLink Scanning_electron_microscope.
- Everhart-Thornley_detector wikiPageWikiLink Scintillator.
- Everhart-Thornley_detector wikiPageWikiLink Secondary_electrons.
- Everhart-Thornley_detector wikiPageWikiLink Sensor.
- Everhart-Thornley_detector wikiPageWikiLink Thomas_Eugene_Everhart.
- Everhart-Thornley_detector wikiPageWikiLink Vladimir_K._Zworykin.
- Everhart-Thornley_detector wikiPageWikiLink Voltage.
- Everhart-Thornley_detector wikiPageWikiLinkText "Everhart-Thornley Detector".
- Everhart-Thornley_detector wikiPageWikiLinkText "Everhart-Thornley detector".
- Everhart-Thornley_detector subject Category:Microscopes.
- Everhart-Thornley_detector hypernym Electron.
- Everhart-Thornley_detector type Instrument.
- Everhart-Thornley_detector type Instrument.
- Everhart-Thornley_detector comment "The Everhart-Thornley Detector (E-T detector or ET detector) is a secondary electron and back-scattered electron detector used in scanning electron microscopes (SEMs). It is named after its designers, Thomas E. Everhart and Richard F. M.".
- Everhart-Thornley_detector label "Everhart-Thornley detector".
- Everhart-Thornley_detector sameAs Q908159.
- Everhart-Thornley_detector sameAs Everhart-Thornley-Detektor.
- Everhart-Thornley_detector sameAs Détecteur_Everhart-Thornley.
- Everhart-Thornley_detector sameAs m.08pdgm.
- Everhart-Thornley_detector sameAs Q908159.
- Everhart-Thornley_detector wasDerivedFrom Everhart-Thornley_detector?oldid=610496905.
- Everhart-Thornley_detector isPrimaryTopicOf Everhart-Thornley_detector.