Application of LIBS to the in-line process control of liquid high-alloy steel under pressure
Application of LIBS to the in-line process control of liquid high-alloy steel under pressure
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DOI：
10.1007/s00216-006-0321-9
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发表时间：
2006-03
影响因子：
4.3
通讯作者：
G. Hubmer;R. Kitzberger;K. Mörwald
中科院分区：
文献类型：
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作者：
G. Hubmer;R. Kitzberger;K. Mörwald
开发了一个过程优化和控制系统VAI-CON Chemhas，它使用激光诱导击穿光谱（LIBS）在压力下对液态高合金钢进行准连续化学分析。Nd：YAG激光器位于安全地面上，以其基本波长工作，其光束由反射镜系统引导至低于熔池水平面的工艺冷却器。光束通过1.5米长的反射镜，然后聚焦到钢池上。从诱导等离子体发出的光通过耦合到光纤电缆的反射器返回，光纤电缆将信息传输到位于激光器旁边的中阶梯光谱仪，距离约为10 m。在系统测试期间，使用位于实验室的完整系统进行校准。使用感应炉来模拟AOD转化器，其中将样品熔融并过热至1600 °C的温度，并在氩气氛下保持在1.7巴的压力下。十二种不同的高合金化参考样品取自Fe浓度>48重量%的正常AOD生产和最高25重量%的非Fe元素浓度可用于校准。获得的平均剩余偏差（定义为LIBS测定的浓度比和参比元素浓度比的方差的平方根）接近于在常温常压下研究的其他可比高合金样品所报告的平均剩余偏差。
A process optimization and control system calledVAI-CON Chemhas been developed that uses laser-induced breakdown spectroscopy (LIBS) to quasi-continuously chemically analyze liquid high-alloy steel under pressure. The beam from a Nd:YAG laser, located on safe ground and operating at its fundamental wavelength, is guided by a mirror system to a process tuyere below bath level. Passing through the ∼1.5 m long tuyere, the beam is then focused onto the steel bath. Light emitted from the induced plasma passes back through the tuyere, which is coupled to a fiber optic cable that carries the information over a distance of approximately 10 m back to an Echelle spectrometer located beside the laser. Calibrations were performed using the complete system, located in a laboratory, during system testing. An induction furnace was used to simulate the AOD converter, wherein the samples were molten and superheated to a temperature of ∼1600 °C and kept at a pressure of ∼1.7 bar under an argon atmosphere. Twelve different high alloyed reference samples taken from normal AOD production with Fe concentrations of >48 wt.% and non-Fe element concentrations of up to 25 wt.% were available for calibration. The mean residual deviations (defined as the square root of the variance of the concentration ratios determined by LIBS and the reference element concentration ratios) obtained were close to those reported for other comparable high-alloy samples that were investigated at room temperature under normal atmospheric pressure.