Li L, Weidner D J
Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794, USA.
Rev Sci Instrum. 2020 Mar 1;91(3):036104. doi: 10.1063/1.5134084.
We report a data analysis protocol for ultrasonic velocity measurements carried out in a synchrotron x-ray facility based multi-anvil high-pressure apparatus. Synthetic ultrasonic signals for the time period between echoes from the two ends of the sample assembly are created with a few simple parameters as the echo waveform is modeled by the first echo from the anvil-assembly boundary. Each echo is modeled as a delta function with an amplitude and arrival time and convolved with this waveform. The final waveform, fit to the data, enables analysis of signals with overlapped echoes as they are common in small cell assemblies and high pressure.
我们报告了一种在基于同步加速器X射线设施的多砧高压装置中进行超声速度测量的数据分析协议。在样品组件两端回波之间的时间段内，通过几个简单参数生成合成超声信号，因为回波波形是由砧座组件边界的第一个回波建模的。每个回波被建模为具有幅度和到达时间的δ函数，并与该波形进行卷积。拟合数据的最终波形能够分析具有重叠回波的信号，因为它们在小样品组件和高压情况下很常见。
