Zinin Pavel V, Prakapenka Vitali B, Burgess Katherine, Odake Shoko, Chigarev Nikolay, Sharma Shiv K
Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, Hawaii 96822, USA.
Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA.
Rev Sci Instrum. 2016 Dec;87(12):123908. doi: 10.1063/1.4972588.
We developed a multi-functional in situ measurement system under high pressure equipped with a laser ultrasonics (LU) system, Raman device, and laser heating system (LU-LH) in a diamond anvil cell (DAC). The system consists of four components: (1) a LU-DAC system (probe and pump lasers, photodetector, and oscilloscope) and DAC; (2) a fiber laser, which is designed to allow precise control of the total power in the range from 2 to 100 W by changing the diode current, for heating samples; (3) a spectrometer for measuring the temperature of the sample (using black body radiation), fluorescence spectrum (spectrum of the ruby for pressure measurement), and Raman scattering measurements inside a DAC under high pressure and high temperature (HPHT) conditions; and (4) an optical system to focus laser beams on the sample and image it in the DAC. The system is unique and allows us to do the following: (a) measure the shear and longitudinal velocities of non-transparent materials under HPHT; (b) measure temperature in a DAC under HPHT conditions using Planck's law; (c) measure pressure in a DAC using a Raman signal; and (d) measure acoustical properties of small flat specimens removed from the DAC after HPHT treatment. In this report, we demonstrate that the LU-LH-DAC system allows measurements of velocities of the skimming waves in iron at 2580 K and 22 GPa.
我们在金刚石对顶砧（DAC）中开发了一种配备激光超声（LU）系统、拉曼装置和激光加热系统（LU-LH）的高压多功能原位测量系统。该系统由四个部分组成：（1）一个LU-DAC系统（探测激光器和泵浦激光器、光电探测器以及示波器）和DAC；（2）一台光纤激光器，其设计目的是通过改变二极管电流，在2至100瓦的范围内精确控制总功率，用于加热样品；（3）一台光谱仪，用于在高温高压（HPHT）条件下测量DAC内部样品的温度（利用黑体辐射）、荧光光谱（用于压力测量的红宝石光谱）以及拉曼散射；（4）一个光学系统，用于将激光束聚焦在样品上并对DAC中的样品成像。该系统独具特色，使我们能够：（a）在高温高压下测量不透明材料的剪切波和纵波速度；（b）利用普朗克定律在高温高压条件下测量DAC中的温度；（c）利用拉曼信号测量DAC中的压力；（d）测量经过高温高压处理后从DAC中取出的小平面样品的声学特性。在本报告中，我们证明了LU-LH-DAC系统能够测量在2580 K和22 GPa下铁中掠波的速度。
