300-MHz optical discriminator-counter

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The prediction of future CO/sub 2/ content in the atmosphere is not completely credible because the oceanographers and terrestrial ecologists do not agree on the global CO/sub 2/ balance. Very precise measurements of O/sub 2//N/sub 2/ ratio using Raman scattering over a few years' period could provide important information and lead to the explanation of the disparity in the atmospheric CO/sub 2/ balance. An optical discriminator-counter has been developed to count closely spaced optical events in the few photon level. Simulated optical events as close as 2.5 ns apart had been positively detected by using selected photomultipliers and optimized discriminators. ... continued below

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Pages: 6

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Turko, B. & Lo, C.C. July 1, 1981.

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Description

The prediction of future CO/sub 2/ content in the atmosphere is not completely credible because the oceanographers and terrestrial ecologists do not agree on the global CO/sub 2/ balance. Very precise measurements of O/sub 2//N/sub 2/ ratio using Raman scattering over a few years' period could provide important information and lead to the explanation of the disparity in the atmospheric CO/sub 2/ balance. An optical discriminator-counter has been developed to count closely spaced optical events in the few photon level. Simulated optical events as close as 2.5 ns apart had been positively detected by using selected photomultipliers and optimized discriminators. Testing of the optical discriminator-counter was done by using an electrical pulse pair spaced 3 ns apart and also by a similar optical pulse pair generated by fast light-emitting diode. The photomultiplier is capable of counting an average single photoelectron pulse frequency of 50 MHz and has a sensitive detecting area of 50 mm in diameter. The discriminator performance is discussed.

Physical Description

Pages: 6

Notes

NTIS, PC A02/MF A01.

Source

  • IEEE symposium on nuclear science, San Francisco, CA, USA, 21 Oct 1981

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  • Other: DE82003710
  • Report No.: LBL-12173
  • Report No.: CONF-811012-28
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5898304
  • Archival Resource Key: ark:/67531/metadc1101615

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 1, 1981

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 24, 2018, 5:40 p.m.

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Turko, B. & Lo, C.C. 300-MHz optical discriminator-counter, article, July 1, 1981; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1101615/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.