Open AccessF2Cor: fast 2-stage correlation algorithm for FCS and DLS
Author(s) -
Emmanuel Schaub
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.002184
Subject(s) - computation , histogram , algorithm , correlation , photon counting , bin , limit (mathematics) , lag , optics , physics , mathematics , computer science , photon , mathematical analysis , artificial intelligence , image (mathematics) , computer network , geometry
We present a new multiple-tau correlation algorithm which is the fastest to date. The resulting curve is identical to that obtained with the conventional multiple-tau algorithm, but the calculation time is much shorter. It combines two approaches. For short values of the lag-time a very simple correlation histogram is used, while for higher lag-time values the traditional multiple-tau bin-and-multiply approach is used. The lag-time limit between these two stages depends on the count rate. The computation time scales linearly with the count rate and is as fast as 0.1 µs/photon.