高温环境中基于声学信号的激光诱导击穿光谱校正方法

doi:10.3964/j.issn.1000-0593(2023)05-1401-07

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Abstract The fluctuations of laser-induced breakdown spectroscopy (LIBS) signals to compromise its quantitative measurement. Acoustic-based spectral correction method has been successfully used in reducing the fluctuations, but up to now, not been studied in high-temperature environments. In this work, the plasmas were generated in a high-temperature environment produced by a methane/air premixed flame. The absorbed energies were measured, and the spectral and acoustic signals were collected simultaneously under different laser incident energies. The compression half of acoustic waveforms was corrected by N shape shockwave theory, then the pulse integral intensity (PII) was used to correct the spectra. The uncertainty of LIBS signals was reduced significantly. Strong linear correlations were found between the absorbed energy and laser energy with the laser energy range of 80~280 mJ, under 1 150 and 1 350 K. The coefficient of determination (R²) was 0.997 9 and 0.998 9, respectively. As the laser energy increased from 80 to 280 mJ, the relative standard deviation (RSD) of absorbed energy decreased from 33.17% to 6.68% under 1 150 K and 34.20% to 6.79% under 1 350 K. Under fixed laser energy, the absorbed energy of plasma under 1 350 K was lower than that under 1 150 K due to the sparser gas density. Because the spectral and acoustic signals were transferred from the internal energy of plasma, they are more related to the absorbed energy than laser energy. The linear correlations between absorbed energy and spectral signals and between absorbed energy and acoustic signals were established. Under 1 150 K, the plasma absorbed energy was 69.24 mJ, and the R² between absorbed energy and H 656 nm, N 746 nm, and O 777 nm was 0.996 1, 0.988 9, and 0.994 8, respectively. Moreover, the R² between absorbed energy and PII was 0.991 6. Under 1 350 K, the R² between absorbed energy and H 656 nm, N 746 nm, and O777 nm was 0.997 5, 0.977 5, and 0.988 7, respectively. Furthermore, The R² between absorbed energy and PII was 0.988 0. Subsequently, the spectral signals were corrected by PII, showing that the fluctuations of LIBS signals can be reduced significantly with the absorbed energy less than 100 mJ. When the laser incident energy was 160 mJ, under 1 150 K, the absorbed energy was 69.24 mJ, RSD of H 656 nm, N 746 nm, and O 777 nm were reduced from uncorrected 16.14%, 21.26%, and 17.24% into corrected 8.75%, 9.15%, and 8.50%, respectively. Under 1 350 K,the absorbed energy was 66.92 mJ, RSD of H 656 nm, N 746 nm, and O 777 nm were reduced from uncorrected 18.22%,24.85%, and 19.13% into corrected 8.46%, 9.52%, and 8.84%, respectively. There sults show that the proposed acoustic-based spectral correction method can effectively reduce the measurement uncertainty of LIBS under high-temperature environment.

Key words：LIBS; High temperature; Acoustic; Spectral correction

Received: 2022-03-14 Accepted: 2022-06-05

ZTFLH:

O433.4

Corresponding Authors: WU Wen-dong E-mail: w.wu@sjtu.edu.cn

Cite this article:

CHAI Shu,PENG Hai-meng,WU Wen-dong. Acoustic-Based Spectral Correction Method for Laser-Induced Breakdown Spectroscopy in High Temperature Environment[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(05): 1401-1407.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2023)05-1401-07 OR https://www.gpxygpfx.com/EN/Y2023/V43/I05/1401

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