太赫兹时域光谱技术在流体包裹体研究中的应用

发布时间：2018-06-05 04:50

本文选题：流体包裹体 + THz-TDS　；参考：《光谱学与光谱分析》2017年12期

【摘要】：流体包裹体是研究矿物晶体演化的重要手段之一,它能反映矿物演化最原始的信息(温度、压力、pH值等)。在演化过程中,温度压力等外界因素直接影响包裹体的数量和大小,从而影响晶体的各种性质。本文利用太赫兹时域光谱系统(THz-TDS),对不同生长温度下KCl晶体内部的包裹体进行了检测,得到了样品的时域、频域和吸收系数曲线,并通过显微镜观察、计算得到了样品内部包裹体的面积,建立了包裹体面积和吸收系数的对应关系模型。通过对样品的吸收系数和样品内部包裹体面积的对比,可以看出二者具有相同的变化趋势,即晶体内部包裹体面积越大,THz吸收系数越大,说明THz吸收系数可以反映不同生长温度的晶体内部包裹体面积的变化情况,解析包裹体面积对太赫兹光学参数的影响,为流体包裹体的研究提供了一种新的有效途径。该研究创新点在于利用THz-TDS快速检测晶体内部包裹体面积的变化情况,说明了太赫兹技术完全可以用于包裹体的研究中,为包裹体的研究提供了一种全新的快速、无损的检测方法。
[Abstract]:Fluid inclusions are one of the important methods to study the evolution of mineral crystals, which can reflect the most primitive information (temperature, pressure, pH value, etc.). In the process of evolution, temperature and pressure and other external factors directly affect the number and size of inclusions, thus affecting the various properties of crystals. In this paper, the inclusions in KCl crystals at different growth temperatures have been detected by using THz TDSs system. The time domain, frequency domain and absorption coefficient curves of the samples have been obtained, and observed by microscope. The area of inclusion in the sample was calculated and the corresponding relationship between the area of inclusion and the absorption coefficient was established. By comparing the absorption coefficient of the sample with the area of the inclusion inside the sample, it can be seen that both have the same changing trend, that is, the larger the area of the inclusions in the crystal is, the larger the absorption coefficient of THz is. It is shown that the THz absorption coefficient can reflect the variation of the inclusions area in the crystals at different growth temperatures, and the influence of the inclusion area on the optical parameters of terahertz is analyzed, which provides a new and effective way for the study of fluid inclusions. The innovation of this study lies in the rapid detection of the area of inclusions in crystals by THz-TDS, which shows that terahertz technique can be used in the study of inclusions and provides a new and rapid method for the study of inclusions. Nondestructive testing method
【作者单位】：中国石油大学(北京)油气光学探测技术北京市重点实验室;
【基金】：国家自然科学基金项目(61405259)资助
【分类号】：O657.3

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