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Proceedings Paper

Pseudo-random single photon counting: the principle, simulation, and experimental results
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Paper Abstract

Time-correlated single photon counting (TCSPC) is popular in time resolved techniques due to its prominent performance such as ultra-high time resolution and ultra-high sensitivity. However, this technique is limited by low counting rate and high system cost. In this paper, we report a new time-resolved optical measurement method which aims to achieve faster data acquisition without losing the key benefits of TCSPC. The new method is based on the spread spectrum time-resolved optical measurement method combined with single photon counting. A pseudo-random bit sequence is used to modulate a continuous wave laser diode, while the pulse sequence in response to the modulated excitation is recorded by a single photon detector. The impulse response is then retrieved by periodic cross-correlation. Both simulation and experimental work have been conducted to validate our approach. Experimental results with our prototype have shown a time-resolution better than 200 picoseconds. Besides the faster data acquisition and high timeresolution, the new method also affords other benefits such as portability and low cost.

Paper Details

Date Published: 24 February 2009
PDF: 7 pages
Proc. SPIE 7170, Design and Quality for Biomedical Technologies II, 71700L (24 February 2009); doi: 10.1117/12.807793
Show Author Affiliations
Qiang Zhang, National Univ. of Singapore (Singapore)
Nan Guang Chen, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 7170:
Design and Quality for Biomedical Technologies II
Ramesh Raghavachari; Rongguang Liang, Editor(s)

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