Noise characterization of a 512 x 16 SPAD line sensor for time-resolved spectroscopy applications

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Time-resolved spectroscopy in the presence of noise is challenging. We have developed a new 512 pixel line sensor with 16 single-photon-avalanche (SPAD) detectors per pixel and ultrafast in-pixel time-correlated single photon counting (TCSPC) histogramming for such applications. SPADs are near shot noise limited detectors but we are still faced with the problem of high dark count rate (DCR) SPADs. The noisiest SPADs can be switched off to optimise signal-to-noiseratios (SNR) at the expense of longer acquisition/exposure times than would be possible if more SPADs were exploited. Here we present detailed noise characterization of our array. We build a DCR map for the sensor and demonstrate the effect of switching off the noisiest SPADs in each pixel. 24% percent of SPADs in the array are measured to have DCR in excess of 1kHz, while the best SPAD selection per pixel reduces DCR to 53+/-7Hz across the entire array. We demonstrate that selection of the lowest DCR SPAD in each pixel leads to the emergence of sparse spatial sampling noise in the sensor.

Original languageEnglish
Title of host publicationOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII
EditorsIsrael Gannot, Israel Gannot
PublisherSPIE
Number of pages12
Volume10488
ISBN (Electronic)9781510614611
DOIs
Publication statusPublished - 13 Feb 2018
EventOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII 2018 - San Francisco, United States
Duration: 27 Jan 201828 Jan 2018

Conference

ConferenceOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII 2018
CountryUnited States
CitySan Francisco
Period27/01/1828/01/18

Keywords

  • CMOS
  • DCR
  • Fluorescence lifetime
  • Histogram
  • Raman
  • Single Photon Counting
  • SPAD
  • sparse sampling noise
  • Spectroscopy
  • TCSPC

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