Spectra correction is essential for the quantification of laser-induced breakdown spectroscopy(LIBS)due to the uncertainties in plasma morphology.In this work,we determined the plasma morphology using a charge-coupled device camera and introduced the spectral correction method based on plasma images to a combustion environment.The plasma length,width,volume,and location were extracted from the plasma images.Using a back-scattering setup,the contribution of plasma location fluctuation to the total spectral fluctuation was mitigated.The integral intensity of the plasma image was used as a proxy of the total number density to correct the spectra.Linear relationships were established between the integral intensities of the plasma images and the spectral intensities,under different laser energy levels and gas temperatures.The image-based correction method could significantly reduce the fluctuation of raw spectral intensities when the laser energy was below 240 mJ.Compared with the correction method based on total spectral areas,the proposed method offered significant improvements in the low energy region,which promises to reduce the signal fluctuations in combustion environments while preserving the spatial resolution and mitigating the flow disturbance.

Shu CHAI;Haimeng PENG;Ziqing ZHAO;Wendong WU

Institute of Thermal Energy Engineering,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,People's Republic of China;Interdisciplinary Research Center for Engineering Science,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,People's Republic of China

等离子体科学和技术（英文版）

[1]Shu CHAI;Haimeng PENG;Ziqing ZHAO;Wendong WU-.Image-based plasma morphology determination and LIBS spectra correction in combustion environments)[J].等离子体科学和技术（英文版）,2022(08):5-14

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