University of Rochester
Cho, Doo Jin (1956 - ).
Dead-time effects in photon counting.
Degree: PhD, 2017, University of Rochester
Dead-time effects are investigated in the context
of photon counting. Simple models of nonparalyzable and paralyzable
counters are considered in the general framework of renewal
processes. Closed-form expressions for the autocorrelation
functions for both nonparalyzable and paralyzable counters are
obtained. The "input-dependent" counter model is also considered,
and a set of fundamental partial integro-differential equations,
which can be used to determine the counting statistics, has been
derived. </br>For the microchannel-plate (MCP)
imaging detector, the dependence of dead-time effects on the size
of illumination area was investigated experimentally. As an
operational model, we propose the independent-paralyzable-counter
model, IPCM, which assumes that each microchannel behaves as an
independent paralyzable counter. For the detector with an MCP
assembly of "V-Z" configuration the dead time increases rapidly as
the illumination area increases, which indicates that the coupling
between microchannels is important. However, for a single
the IPCM gives a good agreement with
experimental results. We have also performed an experiment with a
channel electron multiplier, and found that it behaves as a single
paralyzable counter. It may be concluded that the coupling observed
in the "V-Z" MCP device is due to the complex structure of the
device rather than due to the intrinsic property of the MCP.
</br>As an application we theoretically
investigated both global and local dead-time effects on linear
filtering in quantum-limited image recognition. An expression for
the probability density of photodetection at a specified spatial
position is derived when the local dead-time effects are included.
For detailed images, it is found that local dead-time effects have
significant effects on the recognition capability at a high count
rate. </br>Also dead-time effects were applied to
the generation of sub-Poissonian and antibunched light. An
optoelectronic device, which can
generate either the
nonparalyzable or the paralyzable dead-time effect, has been
constructed using a feedback scheme in conjunction with the
acousto-optic deflector. "Semi-classical" experiments show a good
agreement with theoretical predictions.
to Zotero / EndNote / Reference
APA (6th Edition):
Cho, D. J. (. -. ). (2017). Dead-time effects in photon counting. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/32183
Chicago Manual of Style (16th Edition):
Cho, Doo Jin (1956 - ). “Dead-time effects in photon counting.” 2017. Doctoral Dissertation, University of Rochester. Accessed April 24, 2017.
MLA Handbook (7th Edition):
Cho, Doo Jin (1956 - ). “Dead-time effects in photon counting.” 2017. Web. 24 Apr 2017.
Cho DJ(-). Dead-time effects in photon counting. [Internet] [Doctoral dissertation]. University of Rochester; 2017. [cited 2017 Apr 24].
Available from: http://hdl.handle.net/1802/32183.
Council of Science Editors:
Cho DJ(-). Dead-time effects in photon counting. [Doctoral Dissertation]. University of Rochester; 2017. Available from: http://hdl.handle.net/1802/32183