A time-domain pulse amplitude and width discrimination method for photon counting

Maryam del Mar Correa, Freddy R. Pérez

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This work shows a time-domain method for the discrimination and digitization of parameters of voltage pulses coming from optical detectors, taking into account the presence of electronic noise and afterpulsing. Our scheme is based on an FPGA-based time-to-digital converter as well as an adjustable-threshold comparator complemented with commercial elements. Here, the design, implementation and optimization of a multiphase TDC using delay lines shorter than a single clock period is also described. The performance of this signal processing system is discussed through the results from the statistical code density test, statistical distributions of measurements and information gathered from an optical detector. Unlike dual voltage threshold discriminators or constant-fraction discriminators, the proposed method uses amplitude and time information to define an adjustable discrimination window that enables the acquisition of spectra.

    Original languageEnglish
    Pages (from-to)269-282
    Number of pages14
    JournalMetrology and Measurement Systems
    Volume25
    Issue number2
    DOIs
    StatePublished - 2018

    Bibliographical note

    Funding Information:
    The authors thank Jean-Pierre Galaup from the Aimé Cotton Laboratory at the CNRS for providing valuable feedback throughout this work, and Angel Salazar from Universidad Pontificia Bolivariana for fruitful discussions. Also, we acknowledge the financial support given by Colciencias for the junior researcher grants awarded during 2013 and 2014, and Universidad Pontificia Bolivariana for the scholarship to pursue graduate studies.

    Funding Information:
    The authors thank Jean-Pierre Galaup from the Aimé Cotton Laboratory at the CNRS for providing valuable feedback throughout this work, and Angel Salazar from Universidad Ponti-ficia Bolivariana for fruitful discussions. Also, we acknowledge the financial support given by Colciencias for the junior researcher grants awarded during 2013 and 2014, and Universidad Pontificia Bolivariana for the scholarship to pursue graduate studies.

    Publisher Copyright:
    © 2018 Polish Academy of Sciences. All rights reserved.

    Keywords

    • After-pulsing
    • Discriminator
    • Field-programmable gate array
    • Low-voltage differential signalling
    • Photomultiplier
    • Photon counting
    • Spectroscopy
    • Time-to-digital converter

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