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Abstract <p>The expansion and collapse dynamics of a laser-induced bubble in water, gasoline, and engine oil has been investigated for the first time. The properties of the laser plasma generated inside a bubble for in situ chemical analysis using double-pulse laser-induced breakdown spectrometry (LIBS) were determined. It was found that laser-induced bubble expansion is independent of the liquid nature, whereas the bubble collapse dynamics in water, gasoline, and oil differed in both rates and stability. It was demonstrated that, using double-pulse LIBS, one can record atomic and ionic emission lines in laser plasma, in contrast to the single-pulse laser-induced breakdown in the liquid bulk. The influence of the bubble formation stage on the properties (temperature and electron density) of the laser plasma induced by the second laser pulse in the bubble was investigated, and the optimal time for recording emission lines of the chemical elements of interest was chosen.</p>

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In Situ Double-Pulse Laser-Induced Breakdown Spectroscopy for Sensing the Bulk of Technological Fluids: Cavitation Dynamics and Plasma Properties inside Bubble

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • V. N. Lednev,
  • P. A. Sdvizhenskii,
  • A. V. Rogachevskaya,
  • A. A. Khaziev,
  • S. M. Pershin

摘要

Abstract

The expansion and collapse dynamics of a laser-induced bubble in water, gasoline, and engine oil has been investigated for the first time. The properties of the laser plasma generated inside a bubble for in situ chemical analysis using double-pulse laser-induced breakdown spectrometry (LIBS) were determined. It was found that laser-induced bubble expansion is independent of the liquid nature, whereas the bubble collapse dynamics in water, gasoline, and oil differed in both rates and stability. It was demonstrated that, using double-pulse LIBS, one can record atomic and ionic emission lines in laser plasma, in contrast to the single-pulse laser-induced breakdown in the liquid bulk. The influence of the bubble formation stage on the properties (temperature and electron density) of the laser plasma induced by the second laser pulse in the bubble was investigated, and the optimal time for recording emission lines of the chemical elements of interest was chosen.