Temperature derivatives of P and S wave velocities for mantle high pressure minerals

结果总结如下。锁定放大器被引入超声光谱学。检测被背景噪声掩盖的小信号是必不可少的。它也适用于重建受噪声干扰的信号模式。锁相放大器同时测量信号的“cos”分量和“sin”分量，这样就可以分别对这两个分量进行背景校正.我们证实，手工制作的换能器是有用的高达50兆赫。结合上述改进，这一创新对高频超声光谱学的未来发展具有重要意义.对矩形试件也研究了夹紧力引起的共振频率偏移。在矩形谐振法和球形谐振法中再次证实了所提出的频移机理。这些知识可以应用于未来研究中的共振峰的识别.完成了β、γ尖晶石和钙钛矿的测量。目前正在考虑这些结果的影响。

The results summarized below.1. Lock-in -Amplifier was introduced for ultrasound spectroscopy. It is indispensable to detect small signals masked by back ground noise. It also useful to reconstruct signal pattern disturbed by noise. The "cos" component and "sin" components of the signal simultaneously measured by the Lock-in-Amplifier so that we can conduct background correction separately for the two components.2. We confirmed that handmade -transducers are useful up to 50 MHz. This innovation, combined with the above improvement, is important for future development of high frequency ultrasound spectroscopy.3. Resonance frequency shift by clamp force was also examined fro rectangle specimen. The proposed mechanism for the frequency shift was confirmed again in rectangle resonance method as well as sphere resonance method. The knowledge can be applied for identification of resonant peaks in the future study.4. Measurements of β, γ spinels and perovskite have finished. The implications of the results are now considering.