Digicon


Digicon

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.

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.

References

http://www.stsci.edu/instrument-news/handbooks/ghrs/GHRS_35.html describes (with rather ugly diagrams) the digicons used in the GHRS instrument on Hubble.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Bilhete Único — ( Single Ticket ) is the trademark of the São Paulo transportation system SmartCard.The solution is sponsored by [http://www.sptrans.com.br/ SPTrans] (São Paulo Transporte S/A), the city bus transportation authority, a company linked to municipal …   Wikipedia

  • Classic airsoft — The term classic airsoft is used to describe any airsoft items that were produced before the advent of the modern electric guns (AEGs). The term is debatable; the common consensus is that for an airsoft gun to be a classic it must have been made… …   Wikipedia

  • Compupress — is a Greek publishing company formed in 1982. Originally the company was formed in order to publish computer magazines and books. Following the decline of the computer magazine market, the company expanded to publish fantasy and science fiction,… …   Wikipedia

  • F connector — The F connector is a type of coaxial RF connector commonly used for over the air terrestrial television, cable television and universally for satellite television and cable modems, usually with RG 6/U cable or, in older installations, with RG… …   Wikipedia

  • CGGVeritas — Compagnie Générale de Géophysique Veritas S.A. Type Société Anonyme Traded as Euronext:  …   Wikipedia

  • Liste der CD-Presswerke — Aktuelle und ehemalige Presswerke für CDs weltweit: Unternehmen Produktionsstätte(n) in Cinram International, Inc. [1] Scarborough, Ontario (Kanada Alsdorf (Deutschland), ehemals Record Service GmbH und Warner Music Manufacturing… …   Deutsch Wikipedia

  • Hubble Space Telescope — Infobox Space telescope name = Hubble Space Telescope (HST) caption = The Hubble Space Telescope as seen from Space Shuttle Discovery during its second servicing mission (STS 82) organization = NASAESASTScI alt names = nssdc id =… …   Wikipedia

  • Sheldon Erikson — is currently Chairman of the Board (since May 2, 1996) and President and Chief Executive Officer (since January 1995) of Cameron. He is a member of the Board of Directors of Rockwood Holdings, Inc., the National Petroleum Council, American… …   Wikipedia

  • The 4th Coming — Infobox VG title = The 4th Coming developer = Vircom Interactive (1999 2006) Dialsoft (2006 present)cite web | author=| year= 2006| title=The 4th Coming| format= | work=the4thcoming.com | url=http://www.the4thcoming.com/ | accessdate=2006 10 25]… …   Wikipedia

  • Cinema of Palestine — West Asian cinema Cinema of Armenia Cinema of Azerbaijan Cinema of Bahrain Cinema of Cyprus Cinema of Georgia Cinema of Iran Iranian New Wave …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.