Mr. Yanping Chen Profile

Yanping Chen

at Fuzhou Univ

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Proceedings Article | 24 January 2008 Paper

Signal processing methods in a single-photon counting system

Yanping Chen, Min Du, Rui Li

Proceedings Volume 6829, 68291A (2008) https://doi.org/10.1117/12.754318

KEYWORDS: Signal processing, Interference (communication), Amplifiers, Luminescence, Signal detection, Sensors, Signal to noise ratio, Photomultipliers, Photon counting, Single photon detectors

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Single-photon counting technology has been used extensively in testing due to its powerful quantitative performance for ultraweak luminescence intensity such as high time resolution and large dynamic range. However, some negative factors limit its performance in practice. In this work, the methods for weak signal detection and self-fitting noise suppression were applied to the signal processing in the single-photon counting system in which a photomultiplier tube (PMT) was the photoelectric sensor. Firstly, the weak signal from PMT was amplified by two stage amplifiers and subtracted by its means. And then the lost pluses were corrected by double discriminating voltages as different peaks' circumscriptions. Lastly it was proposed to put program-controlled auto compensation function for self-adjusting ability and high sensitivity. By these methods, the measure errors caused by narrow pulse interval and double-photons peak are decreased whilst the counting efficiency is increased. It was demonstrated that the performance of the single-photon counting system, in which signals were processed with the proposed methods, was enhanced and the system was more flexible in terms of self-fitting measuring.

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