Coincidence counting

Introduction to Nuclear Instrumentation

Published in Douglas S. McGregor, J. Kenneth Shultis, Radiation Detection, 2020

Douglas S. McGregor, J. Kenneth Shultis

The period of time in which the two input pulses can be accepted is defined as the coincidence resolving time, and is determined by the width of the pulses, τ, such that the resolving time is equal to 2τ. A coincidence analyzer produces a logic pulse output when the input pulses, on the active inputs, occur within the resolving time window selected on the front panel. Because detector events occur at random times, accidental coincidences can occur between two pulses which produce background in the coincidence counting. The rate of accidental or random coincidences rR is given by rR=r1r2(2τ), where r1 and r2 are the count rates observed by the two detectors.

Joint spectral characterization of photon-pair sources

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Journal Information

Published in Journal of Modern Optics, 2018

Kevin Zielnicki, Karina Garay-Palmett, Daniel Cruz-Delgado, Hector Cruz-Ramirez, Michael F. O’Boyle, Bin Fang, Virginia O. Lorenz, Alfred B. U’Ren, Paul G. Kwiat

The time-tagger is so named because it ‘tags’ input pulses on a number of channels with a time of arrival. This allows convenient digital post-processing of events, with the ability to find coincidences between different channels with arbitrary intra-channel temporal delays and with arbitrary coincidence window widths; the specific configuration used may be freely chosen after the data are collected. The result is a very powerful tool for applications ranging from singles and coincidence counting, to correlation-based jitter measurements (Section 2.4.1), to complex multi-fold coincidences (Section 2.4.2).

Coincidence counting

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