University of Oulu

Ilkka Nissinen, Jan Nissinen, Pekka Keränen, Juha Kostamovaara, On the effects of the time gate position and width on the signal-to-noise ratio for detection of Raman spectrum in a time-gated CMOS single-photon avalanche diode based sensor, Sensors and Actuators B: Chemical, Volume 241, 31 March 2017, Pages 1145-1152, ISSN 0925-4005, http://dx.doi.org/10.1016/j.snb.2016.10.021. (http://www.sciencedirect.com/science/article/pii/S0925400516316471) Keywords: SPAD detector; Raman spectroscopy; Time gating; Single photon counting

On the effects of the time gate position and width on thesignal-to-noise ratio for detection of Raman spectrum in a time-gated CMOS single-photon avalanche diode based sensor

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Author: Nissinen, Ilkka1; Nissinen, Jan1; Keränen, Pekka1;
Organizations: 1Circuits and Systems Research Unit, University of Oulu, P.O. Box 4500, 90014, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201703245831
Language: English
Published: Elsevier, 2017
Publish Date: 2017-03-24
Description:

Abstract

The effects of the position and width of the time gate on the available signal-to-noise ratio in a time-gated Raman spectrometer are analyzed and measured. The Raman spectrometer used is based on a high power, 532 nm, pulsed laser (500 ps FWHM) and a time-resolving circuit with a single photon avalanche diode (SPAD) detector which is moved by a microstep motor to derive the whole Raman spectrum. The times of arrival of the scattered photons are recorded and the effectiveness of different time gate positions and widths are analyzed by post-processing the measured and simulated data. It is shown from measurements performed on olive and sesame seed oil samples having fluorescence lifetimes of 2.5 ns and 2 ns and Raman-to-fluorescence photon ratios of 0.03 and 0.003, respectively, that the fluorescence background can be substantially suppressed if the width and position of the time gate are properly selected.

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Series: Sensors and actuators b: chemical
ISSN: 0925-4005
ISSN-E: 1873-3077
ISSN-L: 0925-4005
Volume: 241
Pages: 1145 - 1152
DOI: 10.1016/j.snb.2016.10.021
OADOI: https://oadoi.org/10.1016/j.snb.2016.10.021
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
116 Chemical sciences
213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: This work was supported by the Academy of Finland, Centre of Excellence in Laser Scanning Research under Contract 272196, and Contracts 282405 and 292609.
Academy of Finland Grant Number: 272196
282405
292609
Detailed Information: 272196 (Academy of Finland Funding decision)
282405 (Academy of Finland Funding decision)
292609 (Academy of Finland Funding decision)
Copyright information: © 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CCBY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
  https://creativecommons.org/licenses/by-nc-nd/4.0/