Self-calibrated deadtime correction using poisson-tail invariance in event-driven electron detectors
- 1Korea Research Institute of Standards and Science
Abstract
High-flux electron counting with event-driven detectors is fundamentally limited by pixel-level deadtime, resulting in nonlinear count loss, variance suppression, and distortion of spatial intensity profiles. We introduce a monitor-free, self-calibrated deadtime correction method based on the invariance of the long-time Poisson tail of inter-arrival time distributions. Under stationary Poisson illumination, the long-time inter-arrival tail provides an internal statistical estimate of the incident arrival rate, independent of external flux measurements. The approach is demonstrated using high-flux transmission electron microscopy beam-profile measurements, where spatial Fano-factor analysis confirms operation in the deadtime-limited regime. By calibrating an effective extended-deadtime model with the tail-derived rate, the corrected peak count rate increases from approximately 78 kHz to 131 kHz, corresponding to a 67% increase relative to the raw peak. These results establish a self-referenced framework for deadtime correction and dynamic-range extension in event-driven electron detectors, subject to the validity of the stationary-arrival and tail-invariance assumptions.
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BibTeX
@article{lee2026selfcalibrated,
title = {{Self-calibrated deadtime correction using poisson-tail invariance in event-driven electron detectors}},
author = {Joohyun Lee and Ji-Hwan Kwon and Sooheyong Lee},
journal = {Journal of Analytical Science and Technology},
year = {2026},
month = oct,
doi = {10.1186/s40543-026-00574-9},
url = {https://doi.org/10.1186/s40543-026-00574-9},
note = {CC BY},
}
RIS
TY - JOUR
TI - Self-calibrated deadtime correction using poisson-tail invariance in event-driven electron detectors
AU - Joohyun Lee
AU - Ji-Hwan Kwon
AU - Sooheyong Lee
PY - 2026
DA - 2026/10/25
JO - Journal of Analytical Science and Technology
DO - 10.1186/s40543-026-00574-9
UR - https://doi.org/10.1186/s40543-026-00574-9
AB - High-flux electron counting with event-driven detectors is fundamentally limited by pixel-level deadtime, resulting in nonlinear count loss, variance suppression, and distortion of spatial intensity profiles. We introduce a monitor-free, self-calibrated deadtime correction method based on the invariance of the long-time Poisson tail of inter-arrival time distributions. Under stationary Poisson illumination, the long-time inter-arrival tail provides an internal statistical estimate of the incident arrival rate, independent of external flux measurements. The approach is demonstrated using high-flux transmission electron microscopy beam-profile measurements, where spatial Fano-factor analysis confirms operation in the deadtime-limited regime. By calibrating an effective extended-deadtime model with the tail-derived rate, the corrected peak count rate increases from approximately 78 kHz to 131 kHz, corresponding to a 67% increase relative to the raw peak. These results establish a self-referenced framework for deadtime correction and dynamic-range extension in event-driven electron detectors, subject to the validity of the stationary-arrival and tail-invariance assumptions.
SN - 2093-3371
ER -