研制了一套基于激光诱导击穿光谱(LIBS)的化验室水泥质量检测设备, 可对水泥生熟料成分及率值进行快速检测。 对该设备的总体结构、 光学系统、 样本制备、 光谱处理方法等几方面进行了介绍。 通过内标法建立定标模型, 将LIBS测量结果与X射线荧光光谱分析(XRF)结果进行了对比分析, 该套LIBS设备对水泥生熟料中CaO, SiO2, Al2O3和Fe2O3测量的平均绝对误差分别为0.46%, 0.25%, 0.13%和0.05%, 对水泥熟料率值KH, SM, IM测量的平均绝对误差分别为0.02, 0.05和0.04; 通过计算激发产生的等离子体温度和电子密度, 验证了激光诱导水泥等离子体处于局部热平衡(LTE)态。

A laboratory cement quality analysis apparatus based on laser-induced breakdown spectroscopy (LIBS) has been developed for rapid analysis of cement composition and ratio values. In this paper, the overall structure, the optical system, the sample preparation process, as well as the spectral data analysis methods are introduced. The calibration model is established with internal standard method. A comparison as to the measurement results between LIBS and X-ray fluorescence spectrometry (XRF) has been made and being analyzed. It shows that by using the LIBS apparatus, the mean absolute error of CaO, SiO2, Al2O3, and Fe2O3 in cement raw materials is 0.46%, 0.25%, 0.13%, and 0.05%, respectively, while the mean absolute error of the ratio value such as KH, SM, and IM in cement clinker is 0.02, 0.05, and 0.04, respectively. The generated cement plasmas are verified to be in the local thermal equilibrium (LTE) condition by calculating both the plasma temperature and the electron density.