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<p>Elemental imaging is widely attracting attention from various scientific fields, but it suffers from slow sampling speed using conventional Nd:YAG lasers (&lt;100 Hz) and motorized stages. Moreover, using these higher-quality techniques to accelerate the imaging speed to 1000 Hz would be costly. To provide an even faster and more cost-effective elemental imaging alternative, this research integrated a high-repetition-rate fiber laser, a galvanometric scanner, an F-Theta lens, and a high-speed spectrometer to build a high-speed laser-induced breakdown spectrometry imaging system. By optimizing the instrumentation and laser/spectrometer parameters, the spectrum signal was significantly improved compared with that produced by the original system. The limit of detection values for Cu, Mg, Mn, Si, and Cr were calculated to be 422.6, 361.3, 256.4, 481.9, and 300.3 μg/g, respectively. After the moving parameters of the galvanometric scanner were thoroughly adjusted, a maximum pixel sampling rate of 2013 Hz was achieved. A real rock sample was tested using the imaging system, by which the distribution pattern of nine elements — Mg, Al, Si, K, Li, O, Sr, Fe, and Na — was clearly determined to be in accordance with the different regions of color in the corresponding photograph. The results verify the viability of the high-speed imaging system devised in this study.</p>

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Development of a High-Speed Laser-Induced Breakdown Spectroscopy Imaging System with a Pixel Sampling Rate Exceeding 2000 Hz

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Shudi Zhang,
  • Binbin Xu,
  • Fangfang Chen,
  • Yupei Chen,
  • Hongtan Wu,
  • Gueyhorng Wang

摘要

Elemental imaging is widely attracting attention from various scientific fields, but it suffers from slow sampling speed using conventional Nd:YAG lasers (<100 Hz) and motorized stages. Moreover, using these higher-quality techniques to accelerate the imaging speed to 1000 Hz would be costly. To provide an even faster and more cost-effective elemental imaging alternative, this research integrated a high-repetition-rate fiber laser, a galvanometric scanner, an F-Theta lens, and a high-speed spectrometer to build a high-speed laser-induced breakdown spectrometry imaging system. By optimizing the instrumentation and laser/spectrometer parameters, the spectrum signal was significantly improved compared with that produced by the original system. The limit of detection values for Cu, Mg, Mn, Si, and Cr were calculated to be 422.6, 361.3, 256.4, 481.9, and 300.3 μg/g, respectively. After the moving parameters of the galvanometric scanner were thoroughly adjusted, a maximum pixel sampling rate of 2013 Hz was achieved. A real rock sample was tested using the imaging system, by which the distribution pattern of nine elements — Mg, Al, Si, K, Li, O, Sr, Fe, and Na — was clearly determined to be in accordance with the different regions of color in the corresponding photograph. The results verify the viability of the high-speed imaging system devised in this study.