Development of new instrumentation and techniques for real-time spatial interferometry of geophysical processes

0345935规模从这个赠款的支持将允许物理声学实验室在科罗拉多矿业学校获得超快（飞秒）锁模激光器，超快CCD相机（100 ns快门）的成像光谱仪，和必要的辅助设备，以显着提高信噪比和采集速度的激光干涉技术的高保真度空间和时间观测的传播，自然和人造材料表面的弹性波。 在传统的地震和超声波测量中，接触式传感器用于测量单点处的弹性波。 在该计划（ESTA-0111804）的先前支持下，Scales和他的博士学位。学生（K.货车Wijk），现在是CSM的研究科学家），开发了一种用于非接触和非破坏性地震学的激光测振仪干涉技术，可以测量数万个点的弹性波。 这种支持将有助于更快速的非接触式声学干涉测量技术，因此将允许在样品表面上改进测量的空间分布。 虽然该技术不允许在原位条件下研究岩石性质，但它将提供测量高散射介质中弹性波场的时间演化的机会。 这笔赠款是对一项独特技术的杠杆投资，该技术对医学成像、非破坏性评估、地雷探测、碳氢化合物勘探和地震学具有潜在的广泛影响。 ***

0345935ScalesSupport from this grant will allow the Physical Acoustics Lab at the Colorado School of Mines to acquire an ultrafast (femtosecond) mode-locked laser, ultrafast CCD camera (100 ns shutter) based imaging spectrometer, and ancillary equipment necessary to dramatically improve the signal to noise ratio and acquisition speed of laser interferometric techniques for high fidelity spatial and temporal observations of the propagation of elastic waves across the surfaces of natural and man-made materials. In traditional seismic and ultrasonic measurements, contacting transducers are used to measure elastic waves at a single point. Under previous support from this program (EAR-0111804) Scales and his Ph.D. student (K. van Wijk), now a research scientist at CSM), developed a laser vibrometer interferometric technique for non-contact and non-destructive seismology which can measure elastic waves at tens of thousands of points. This support will facilitate more rapid non-contacting acoustic interferometric techniques and will therefore allow for improved spatial distribution of measurements over the surface of samples. While the technique will not allow for study of rock properties under in situ conditions, it will offer the opportunity to measuring the temporal evolution of elastic wavefields in highly scattering media. This grant is a leveraged investment in a unique technology that has potential broad implications for medical imaging, non-destructive evaluation, land-mine detection, hydrocarbon exploration and seismology. ***