A correction formula for coincidence counting

Wyllie, H.A.

doi:10.1016/0883-2889(87)90027-x

Cited by 3 publications

(2 citation statements)

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“…In a simple coincidence measurement strategy digital pulses from two GM-APDs are sent to an electronic AND gate [12] where overlapping pulses give a coincidence event. Two independent streams of photons from uncorrelated sources will occasionally produce coincidences [17,18] termed accidental coincidences. When detectors are operating far below their saturation thresholds the rate of accidental coincidences, C acc can be estimated by:…”

Section: The Effective Duty Cyclementioning

confidence: 99%

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Correcting for accidental correlations in saturated avalanche photodiodes

Grieve¹,

Chandrasekara²,

Tang³

et al. 2016

Opt. Express

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In this paper we present a general method for estimating rates of accidental coincidence between a pair of single photon detectors operated within their saturation regimes. By folding the effects of recovery time of both detectors and the detection circuit into an "effective duty cycle" we are able to accomodate complex recovery behaviour at high event rates. As an example, we provide a detailed high-level model for the behaviour of passively quenched avalanche photodiodes, and demonstrate effective background subtraction at rates commonly associated with detector saturation. We show that by post-processing using the updated model, we observe an improvement in polarization correlation visibility from 88.7% to 96.9% in our experimental dataset. This technique will be useful in improving the signal-to-noise ratio in applications which depend on coincidence measurements, especially in situations where rapid changes in flux may cause detector saturation.

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Section: The Effective Duty Cyclementioning

confidence: 99%

“…When this is taken into account, it is clear that Eq 1 leads to an underestimation because the detection events are actually taking place over a smaller fraction of time, increasing the chance of accidental overlap of digital pulses. Using similar arguments to [18] we arrive at a corrected expression for C acc :…”

Section: The Effective Duty Cyclementioning

confidence: 99%