Fiber-optic laser-induced breakdown spectroscopy of zirconium metal in air: Special features of the plasma produced by a long-pulse laser
Fiber-optic laser-induced breakdown spectroscopy of zirconium metal in air: Special features of the plasma produced by a long-pulse laser
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DOI：
10.1016/j.sab.2018.01.012
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发表时间：
2018-04-01
影响因子：
3.3
通讯作者：
Wakaida, Ikuo
中科院分区：
文献类型：
--
作者：
Matsumoto, Ayumu;Ohba, Hironori;Wakaida, Ikuo
东京电力公司(东京电力公司)福岛第一核电站的退役是核研发中的一个关键问题。光纤激光诱导击穿光谱(光纤LIBS)可以用于对受损反应堆内部的现场元素分析。为了提高在恶劣条件下的性能，使用长脉冲激光可以是一种有效的选择。本文比较了常规脉冲(6 Ns)激光和长脉冲(100 Ns)激光(波长：1064 nm，脉冲能量：12.5mJ，光斑直径：0.35 mm)在空气中的发射光谱，研究了长脉冲激光作用下光纤LIBS的基本特性。光谱特征有很大的不同：当使用长脉冲激光时，原子和分子的发射显著增强。近红外(NIR)区域原子发射的增强将导致观察到重叠最小的发射线。为了了解正常脉冲激光和长脉冲激光产生的光谱的不同，研究了长脉冲激光产生的等离子体的光电二极管信号、时间分辨光谱、等离子体参数、环境空气发射和发射区域的特殊特性。(C)2018爱思唯尔E.V.保留所有权利。
The decommissioning of the Tokyo Electric Power Company (TEPCO) Fukushima Daiichi Nuclear Power Plant is an essential issue in nuclear R&D. Fiber-optic laser-induced breakdown spectroscopy (Fiber-optic LIBS) could be used for in-situ elemental analysis of the inside of the damaged reactors. To improve the performances under difficult conditions, using a long-pulse laser can be an efficient alternative. In this work, the emission spectra of zirconium metal in air obtained for a normal-pulse laser (6 ns) and a long-pulse laser (100 ns) (wavelength: 1064 nm, pulse energy: 12.5 mJ, spot diameter: 0.35 mm) are compared to investigate the fundamental aspects of fiber-optic LIBS with the long-pulse laser. The spectral features are considerably different: when the long-pulse laser is used, the atomic and molecular emission is remarkably enhanced. The enhancement of the atomic emission at the near infrared (NIR) region would lead to the observation of emission lines with minimum overlapping. To understand the differences in the spectra induced respectively from the normal-pulse laser and the long-pulse laser, photodiode signals, time-resolved spectra, plasma parameters, emission from the ambient air, and emission regions are investigated, showing the particular characteristics of the plasma produced by the long-pulse laser. (C) 2018 Elsevier E.V. All rights reserved.