Effect of deadtime in imaging detectors

Abhay Sharma; John G. Walker

doi:10.1117/12.19112

1 July 1990 Effect of deadtime in imaging detectors

Abhay Sharma, John G. Walker

Proceedings Volume 1235, Instrumentation in Astronomy VII; (1990) https://doi.org/10.1117/12.19112
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

The first and second order statistics in a deadtime affected photo counting distribution are analysed. The reduced mean count rate is modeled for paralyzable and nonparalyzable deadtime in a two-dimensional imaging array. In certain limits the derived expressions are shown to agree with previously published results for single element detectors. A simulation is used to demonstrate the effect deadtime has on the speckle contrast and the speckle peak in the autocorrelation function of static laser speckle. The theoretical approach necessary to describe this behavior is also presented.

Citation Download Citation

Abhay Sharma and John G. Walker "Effect of deadtime in imaging detectors", Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); https://doi.org/10.1117/12.19112

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