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Time Scale Expansion and G(0) in a 50 Nanosecond Real Time Digital Correlator

  • E Serrallach
  • H R Haller
  • S Briggs
  • M Zulauf
Part of the Nato Advanced Study Institutes Series book series (NSSB, volume 23)

Abstract

In order to have twice scale expansion of the correlation function during a real time measurement in our 96 channel Malvern correlator, we have devised the following modifications to be used in the scaling mode of operation (crosscorrelation of the signal with its scaled version): in the first group of 8 channels the correlator is operated with a short sampling time (ST) equal to T 1 and scale level s 1 . For the following 64 channels the ST and the scale level can be expanded by a factor S 1 adjustable between 2 and 16. The channels therefore run with T 2 = S 1 · T 1 and s 2 = S 1 · s 1 . In the last 24 channels there is a second expansion S 2 , therefore T 3 = S 1 · S 2 · T 1 and s 3 = S 1 · S 2 · s 1 . The first group gives in an expanded scale the behavior of the correlation for small delay times, in the intermediate group the main part of the relaxation is observed, whereas the dying away to g (2) () can be followed in the last group. In each of the three groups the correlator forms the following sums

Keywords

Correlation Function Photon Correlation Spectroscopy Scale Level Shift Register Real Time Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1977

Authors and Affiliations

  • E Serrallach
    • 1
  • H R Haller
    • 1
  • S Briggs
    • 1
  • M Zulauf
    • 2
  1. 1.Lab. für FestkörperphysikETHZürichSwitzerland
  2. 2.Abt. StrukturbiologieBiozentrum BaselBaselSwitzerland

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