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Related Experiment Video

Updated: Dec 21, 2025

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Dual-laser-induced Breakdown Thermometry via Sound Speed Measurement：A New Procedure for Improved Spatiotemporal

Shen Li1, Wubin Weng1, Chengdong Kong1,2

  • 1Division of Combustion Physics, Lund University, P.O. Box 118, Lund 22100, Sweden.

Sensors (Basel, Switzerland)
|May 20, 2020
PubMed
Summary

A new dual-laser-induced breakdown thermometry (DLIBT) method improves gas temperature measurements in combustion. This technique significantly reduces uncertainty from laser breakdown, enhancing accuracy for combustion atmosphere analysis.

Keywords:
combustion atmospheredual-laser-induced breakdown thermometryhigh-temperature measurementlaser-induced acoustic wavemeasurement of acoustic wave

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Area of Science:

  • Combustion diagnostics
  • Laser-based thermometry
  • Acoustic wave propagation

Background:

  • Laser-induced breakdown thermometry measures gas temperature using acoustic waves.
  • Previous methods suffered ~5% uncertainty due to local gas breakdown interference.
  • Improved spatial and temporal resolution is needed for accurate combustion diagnostics.

Purpose of the Study:

  • To develop an advanced laser-induced breakdown thermometry technique.
  • To minimize system uncertainty caused by local gas breakdown.
  • To enhance the temporal and spatial resolution of gas thermometry.

Main Methods:

  • Proposed a new measurement procedure using dual laser pulses with optimized firing order and delay.
  • Implemented dual-laser-induced breakdown thermometry (DLIBT).
  • Applied DLIBT to measure temperatures in hot flue gases from a multijet burner.

Main Results:

  • Significantly reduced system uncertainty associated with local gas breakdown.
  • Achieved temporal resolution of 0.5 ms and spatial resolution of 10 mm.
  • Measured temperatures between 1000 K and 2000 K with good agreement to two-line atomic fluorescence (TLAF) thermometry (~3% uncertainty).

Conclusions:

  • The dual-laser-induced breakdown thermometry (DLIBT) offers a more accurate method for gas thermometry in combustion.
  • The optimized procedure effectively mitigates breakdown-induced uncertainties.
  • DLIBT provides high-resolution temperature measurements suitable for complex combustion environments.