Digicon: Difference between revisions
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In 1971, E.A. Beaver and Carl McIlwain successfully demonstrated a way in which silicon diodes can be used in digital tube by placing a silicon diode array that contained 38 elements in the same chamber as a photocathode.<ref name=":0" /> The design and manufacture of the Digicon tube is attributed to John Choisser of the Electronic Vision Corporation.<ref>{{Cite book|title=Advances in Electronics and Electron Physics|last=Morgan|first=B.L.|last2=Airey|first2=R.W.|last3=McMullan|first3=D.|publisher=Academic Press|year=1976|isbn=0120145545|location=London|pages=761}}</ref> |
In 1971, E.A. Beaver and Carl McIlwain successfully demonstrated a way in which silicon diodes can be used in digital tube by placing a silicon diode array that contained 38 elements in the same chamber as a photocathode.<ref name=":0" /> The design and manufacture of the Digicon tube is attributed to John Choisser of the Electronic Vision Corporation.<ref>{{Cite book|title=Advances in Electronics and Electron Physics|last=Morgan|first=B.L.|last2=Airey|first2=R.W.|last3=McMullan|first3=D.|publisher=Academic Press|year=1976|isbn=0120145545|location=London|pages=761}}</ref> |
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Digicon detectors were used on the original instruments for the [[Hubble Space Telescope]], but are very rarely used in new designs, where [[CMOS]] active-pixel detectors can achieve the same performance without the need for large electric fields or complicated vacuum assemblies.{{citation needed|date=February 2016}} For instance, there were two pulse-counting Digicon detectors in the [[Goddard High Resolution Spectrograph]] installed on the Hubble Space Telescope from |
Digicon detectors were used on the original instruments for the [[Hubble Space Telescope]], but are very rarely used in new designs, where [[CMOS]] active-pixel detectors can achieve the same performance without the need for large electric fields or complicated vacuum assemblies.{{citation needed|date=February 2016}} For instance, there were two pulse-counting Digicon detectors in the [[Goddard High Resolution Spectrograph]] installed on the Hubble Space Telescope from 1990–1997, used to record ultraviolet spectra.<ref>{{Cite book|url=https://books.google.com/books?id=67joCAAAQBAJ&pg=PA186|title=Astronomy and Astrophysics Abstracts: Volume 42 Literature 1986|last=Böhme|first=S.|last2=Esser|first2=U.|last3=Hefele|first3=H.|last4=Heinrich|first4=I.|last5=Hofmann|first5=W.|last6=Krahn|first6=D.|last7=Matas|first7=V. R.|last8=Schmadel|first8=L. D.|last9=Zech|first9=G.|date=2013|publisher=Springer Science & Business Media|isbn=978-3-662-12382-9|page=186}}</ref> Digicon is also used in digital imaging such as the case of a scanning gage using Digicon imaging tube, which generates a two-dimensional view with high spatial resolution when an object is scanned past the Digicon.<ref>{{Cite book|title=Practical Applications of Neutron Radiography and Gaging|last=Berger|first=Harold|publisher=ASTM International|year=1976|isbn=0803105355|location=Philadelphia, PA|pages=72}}</ref> |
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==References== |
==References== |
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Latest revision as of 17:50, 7 October 2023
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (September 2009) |
A digicon detector is a spatially resolved light detector using the photoelectric effect directly. It uses magnetic and electric fields operating in a vacuum to focus the electrons released from a photocathode by incoming light onto a collection of silicon diodes. It is a photon-counting instrument, so most useful for weak sources.[1] One of digicon's advantages is its very large dynamic range and it results from the short response and decay times of silicon diodes.[2]
Development[edit]
In 1971, E.A. Beaver and Carl McIlwain successfully demonstrated a way in which silicon diodes can be used in digital tube by placing a silicon diode array that contained 38 elements in the same chamber as a photocathode.[2] The design and manufacture of the Digicon tube is attributed to John Choisser of the Electronic Vision Corporation.[3]
Digicon detectors were used on the original instruments for the Hubble Space Telescope, but are very rarely used in new designs, where CMOS active-pixel detectors can achieve the same performance without the need for large electric fields or complicated vacuum assemblies.[citation needed] For instance, there were two pulse-counting Digicon detectors in the Goddard High Resolution Spectrograph installed on the Hubble Space Telescope from 1990–1997, used to record ultraviolet spectra.[4] Digicon is also used in digital imaging such as the case of a scanning gage using Digicon imaging tube, which generates a two-dimensional view with high spatial resolution when an object is scanned past the Digicon.[5]
References[edit]
- ^ "The Digicon Detectors". www.stsci.edu.
- ^ a b Meaburn, J. (2012). Detection and Spectrometry of Faint Light. Dordrecht: Springer Science+Business Media, B.V. p. 36. ISBN 9789027711984.
- ^ Morgan, B.L.; Airey, R.W.; McMullan, D. (1976). Advances in Electronics and Electron Physics. London: Academic Press. p. 761. ISBN 0120145545.
- ^ Böhme, S.; Esser, U.; Hefele, H.; Heinrich, I.; Hofmann, W.; Krahn, D.; Matas, V. R.; Schmadel, L. D.; Zech, G. (2013). Astronomy and Astrophysics Abstracts: Volume 42 Literature 1986. Springer Science & Business Media. p. 186. ISBN 978-3-662-12382-9.
- ^ Berger, Harold (1976). Practical Applications of Neutron Radiography and Gaging. Philadelphia, PA: ASTM International. p. 72. ISBN 0803105355.
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