Acquisition of a Broadband Oscilloscope for Gigahertz-Ultrasonic Studies of Mineral Elasticity in the Diamond Anvil Cell

获取宽带示波器，用于金刚石砧池中矿物弹性的千兆赫超声波研究

• 批准号: 0651173
• 负责人: Steven Jacobsen
• 金额: $ 5.45万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2008-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0651173&HistoricalAwards=false
• 关键词: Acquisition; Broadband; Oscilloscope; Gigahertz; Ultrasonic

This award supports the acquisition of a digitizing oscilloscope for the new Mineral Physics Laboratory in the Department of Earth and Planetary Sciences at Northwestern University. The multi-channel broadband (20-GHz) oscilloscope is capable of capturing and analyzing high-speed acoustic waveforms emitted from an ultrasonic interferometer, recently developed to determine the elastic properties of Earth and planetary materials in diamond-anvil cells at ultra-high P-T conditions (300 km depth). The elastic properties of minerals govern the velocity of seismic waves in the Earth's mantle. Laboratory-derived elasticity data are applied in solid-Earth geophysics to interpret the observed seismic structure of the mantle in terms of constituent mineralogy and compositional variability. Recent science in the GHz-ultrasonic laboratory has focused on quantifying the effects of hydrogen impurities (water) on the elastic properties of high-pressure mantle minerals in order to test new models of a deep-Earth water cycle. The GHz-ultrasonic interferometry laboratory currently employs one postdoctoral researcher, one graduate student, and over the past two summers has trained two undergraduate students in experimental geophysics.

该奖项支持西北大学地球与行星科学系新矿物物理实验室购买数字化示波器。多通道宽带（20 GHz）示波器能够捕获和分析超声波干涉仪发射的高速声波波形，该干涉仪是最近开发的，用于在超高P-T条件下（300 km深度）确定金刚石砧单元中地球和行星材料的弹性特性。矿物的弹性决定了地震波在地幔中的速度。在固体地球物理学中，应用地震学导出的弹性数据，从成分矿物学和成分变异性方面解释所观察到的地幔地震结构。GHz超声波实验室最近的科学重点是量化氢杂质（水）对高压地幔矿物弹性特性的影响，以测试地球深部水循环的新模型。GHz超声干涉测量实验室目前雇用了一名博士后研究员，一名研究生，并在过去的两个夏天已经培养了两名本科生在实验物理学。