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

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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 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.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Shanghai Jiao Tong University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik
  • Strömningsmekanik och akustik

Nyckelord

Originalspråkengelska
Artikelnummer2803
TidskriftSensors (Switzerland)
Volym20
Utgåva nummer10
StatusPublished - 2020 maj 14
PublikationskategoriForskning
Peer review utfördJa