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University of Rochester

1. 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 curved-channel MCP, 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.

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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 June 24, 2017. http://hdl.handle.net/1802/32183.

MLA Handbook (7th Edition):

Cho, Doo Jin (1956 - ). “Dead-time effects in photon counting.” 2017. Web. 24 Jun 2017.

Vancouver:

Cho DJ(-). Dead-time effects in photon counting. [Internet] [Doctoral dissertation]. University of Rochester; 2017. [cited 2017 Jun 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

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