Laser induced breakdown spectroscopy (LIBS) has been investigated as a potential multi-element quantitative analysis tool for the quality control of on-line steel production. This research investigated influence of sample temperature on steel sample measurement using collinear long-short dual-pulse LIBS (long-short DP-LIBS) and single-pulse LIBS (SP-LIBS). The standard steel sample has been uniformly heated in a muffle furnace from 20°C to 700°C. The experimental results show that sample temperature has significantly effect on measurement result using SP-LIBS. However, long-short DP-LIBS can effectively reduce the sample temperature effect on measurement result. The detection characteristics of long-short DP-LIBS and SP-LIBS were compared using the intensity ratio of I _{Mn 404.136 nm}/I _{Fe 400.524 nm} and I _{Fe 402.187 nm}/I _{Fe 400.524 nm} under different delay time and different sample temperature conditions. The signal intensity and plasma temperature can be maintained higher and more stable for a period of time and at different sample temperature by long-short DP-LIBS with smaller error bar compared with that of SP-LIBS, which indicated long-short DP-LIBS has better measurement repeatability than SP-LIBS. The plasma temperature correction method was applied to compare the detection features of long-short DP-LIBS and SP-LIBS. The signal stability of long-short DP-LIBS measurement was improved significantly at different sample temperature with plasma temperature correction. These results demonstrated that the effect of sample temperature can be reduced using long-short DP-LIBS method to improve the on-line detection capability for steel measurement in complex environment.

激光诱导击穿光谱法（LIBS）已被研究为在线钢铁生产质量控制的潜在多元素定量分析工具。本研究调查了样品温度对使用共线长短双脉冲LIBS（长短DP-LIBS）和单脉冲LIBS（SP-LIBS）的钢样品测量的影响。在马弗炉中将标准钢样品从20°C均匀加热到700°C。实验结果表明，样品温度对使用SP-LIBS的测量结果有显着影响。但是，长短DP-LIBS可以有效降低样品温度对测量结果的影响。使用I _{Mn 404.136 nm} / I的强度比比较了多空DP-LIBS和SP-LIBS的检测特性_{Fe 400.524 nm}和I _{Fe 402.187 nm} / I _{Fe 400.524 nm}在不同的延迟时间和不同的样品温度条件下。与SP-LIBS相比，具有短误差棒的长短DP-LIBS可以在一段时间和不同的样品温度下，在一段时间内保持较高的信号强度和等离子体温度，这表明长短DP-LIBS比SP-LIBS具有更好的测量重复性。采用等离子体温度校正方法比较了长短DP-LIBS和SP-LIBS的检测特征。通过等离子体温度校正，在不同的样品温度下，长短DP-LIBS测量的信号稳定性得到了显着改善。这些结果表明，使用长短DP-LIBS方法可以降低样品温度的影响，从而提高复杂环境中钢测量的在线检测能力。