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Impact of plasma dynamics on equivalence ratio measurements by laser-induced breakdown spectroscopy

Kiefer, Johannes; Zhou, Bo LU ; Li, Zhongshan LU and Aldén, Marcus LU (2015) In Applied Optics 54(13). p.4221-4226
Abstract
The systematic errors introduced by triggering a USB spectrometer for laser-induced breakdown spectroscopy equivalence ratio measurements are studied. We analyze the temporal behavior of laser-induced plasma in a nonreacting methane/air mixture and investigate the influence of the dynamics on equivalence ratio measurements with gated and ungated detection. For use of gated detectors, optimal delay times were found to be between 500 and 2000 ns to allow effective suppression of interferences while maintaining sufficient signal-to-noise levels. Good precision was found for short and long exposure time intervals when an intensified CCD camera was employed. On the other hand, the jitter of an externally triggered ungated spectrometer leads to... (More)
The systematic errors introduced by triggering a USB spectrometer for laser-induced breakdown spectroscopy equivalence ratio measurements are studied. We analyze the temporal behavior of laser-induced plasma in a nonreacting methane/air mixture and investigate the influence of the dynamics on equivalence ratio measurements with gated and ungated detection. For use of gated detectors, optimal delay times were found to be between 500 and 2000 ns to allow effective suppression of interferences while maintaining sufficient signal-to-noise levels. Good precision was found for short and long exposure time intervals when an intensified CCD camera was employed. On the other hand, the jitter of an externally triggered ungated spectrometer leads to high uncertainties. Running the ungated spectrometer freely, the single-shot uncertainty can be reduced by more than 1 order of magnitude. (C) 2015 Optical Society of America (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Optics
volume
54
issue
13
pages
4221 - 4226
publisher
OSA
external identifiers
  • wos:000353980900071
  • scopus:84942366593
ISSN
2155-3165
DOI
10.1364/AO.54.004221
language
English
LU publication?
yes
id
b53e740d-b281-4ec0-8509-fe2fbee8be83 (old id 7410717)
date added to LUP
2015-06-29 11:09:21
date last changed
2017-04-23 03:15:02
@article{b53e740d-b281-4ec0-8509-fe2fbee8be83,
  abstract     = {The systematic errors introduced by triggering a USB spectrometer for laser-induced breakdown spectroscopy equivalence ratio measurements are studied. We analyze the temporal behavior of laser-induced plasma in a nonreacting methane/air mixture and investigate the influence of the dynamics on equivalence ratio measurements with gated and ungated detection. For use of gated detectors, optimal delay times were found to be between 500 and 2000 ns to allow effective suppression of interferences while maintaining sufficient signal-to-noise levels. Good precision was found for short and long exposure time intervals when an intensified CCD camera was employed. On the other hand, the jitter of an externally triggered ungated spectrometer leads to high uncertainties. Running the ungated spectrometer freely, the single-shot uncertainty can be reduced by more than 1 order of magnitude. (C) 2015 Optical Society of America},
  author       = {Kiefer, Johannes and Zhou, Bo and Li, Zhongshan and Aldén, Marcus},
  issn         = {2155-3165},
  language     = {eng},
  number       = {13},
  pages        = {4221--4226},
  publisher    = {OSA},
  series       = {Applied Optics},
  title        = {Impact of plasma dynamics on equivalence ratio measurements by laser-induced breakdown spectroscopy},
  url          = {http://dx.doi.org/10.1364/AO.54.004221},
  volume       = {54},
  year         = {2015},
}