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Dual-laser-induced breakdown thermometry via sound speed measurement: A new procedure for improved spatiotemporal resolution

Li, Shen LU ; Weng, Wubin LU ; Kong, Chengdong LU ; Aldén, Marcus LU and Li, Zhongshan LU (2020) In Sensors (Switzerland) 20(10).
Abstract

Measurement of acoustic waves from laser-induced breakdown has been developed as gas thermometry in combustion atmospheres. In the measurement, two laser-induced breakdown spots are generated and the local gas temperature between these two spots is determined through the measurement of the sound speed between them. In the previous study, it was found that the local gas breakdown can introduce notable system uncertainty, about 5% to the measured temperature. To eliminate the interference, in present work, a new measurement procedure was proposed, where two individual laser pulses with optimized firing order and delay time were employed. With the new measurement procedure, the system uncertainty caused by local gas breakdown can be... (More)

Measurement of acoustic waves from laser-induced breakdown has been developed as gas thermometry in combustion atmospheres. In the measurement, two laser-induced breakdown spots are generated and the local gas temperature between these two spots is determined through the measurement of the sound speed between them. In the previous study, it was found that the local gas breakdown can introduce notable system uncertainty, about 5% to the measured temperature. To eliminate the interference, in present work, a new measurement procedure was proposed, where two individual laser pulses with optimized firing order and delay time were employed. With the new measurement procedure, the system uncertainty caused by local gas breakdown can be largely avoided and the temporal and spatial resolutions can reach up to 0.5 ms and 10 mm, respectively. The improved thermometry, dual-laser-induced breakdown thermometry (DLIBT), was applied to measure temperatures of hot flue gases provided by a multijet burner. The measured temperatures covering the range between 1000 K and 2000 K were compared with the ones accurately obtained through the two-line atomic fluorescence (TLAF) thermometry with a measurement uncertainty of ~3%, and a very good agreement was obtained.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Combustion atmosphere, Dual-laser-induced breakdown thermometry, High-temperature measurement, Laser-induced acoustic measurement of acoustic wave
in
Sensors (Switzerland)
volume
20
issue
10
article number
2803
publisher
MDPI AG
external identifiers
  • pmid:32423122
  • scopus:85085133221
ISSN
1424-8220
DOI
10.3390/s20102803
language
English
LU publication?
yes
id
7c7e76a3-0872-4cf7-8c0e-89265f266422
date added to LUP
2020-06-16 17:12:37
date last changed
2020-06-17 05:10:21
@article{7c7e76a3-0872-4cf7-8c0e-89265f266422,
  abstract     = {<p>Measurement of acoustic waves from laser-induced breakdown has been developed as gas thermometry in combustion atmospheres. In the measurement, two laser-induced breakdown spots are generated and the local gas temperature between these two spots is determined through the measurement of the sound speed between them. In the previous study, it was found that the local gas breakdown can introduce notable system uncertainty, about 5% to the measured temperature. To eliminate the interference, in present work, a new measurement procedure was proposed, where two individual laser pulses with optimized firing order and delay time were employed. With the new measurement procedure, the system uncertainty caused by local gas breakdown can be largely avoided and the temporal and spatial resolutions can reach up to 0.5 ms and 10 mm, respectively. The improved thermometry, dual-laser-induced breakdown thermometry (DLIBT), was applied to measure temperatures of hot flue gases provided by a multijet burner. The measured temperatures covering the range between 1000 K and 2000 K were compared with the ones accurately obtained through the two-line atomic fluorescence (TLAF) thermometry with a measurement uncertainty of ~3%, and a very good agreement was obtained.</p>},
  author       = {Li, Shen and Weng, Wubin and Kong, Chengdong and Aldén, Marcus and Li, Zhongshan},
  issn         = {1424-8220},
  language     = {eng},
  month        = {05},
  number       = {10},
  publisher    = {MDPI AG},
  series       = {Sensors (Switzerland)},
  title        = {Dual-laser-induced breakdown thermometry via sound speed measurement: A new procedure for improved spatiotemporal resolution},
  url          = {http://dx.doi.org/10.3390/s20102803},
  doi          = {10.3390/s20102803},
  volume       = {20},
  year         = {2020},
}