论文标题
使用脉冲回波技术应用基于FPGA的锁定放大器进行超声传播测量
Application of FPGA based Lock-in amplifier for ultrasound propagation measurements using the pulse-echo technique
论文作者
论文摘要
我们描述了最先进的数字FPGA锁定放大器的应用，以在低温和高静态磁场中以固定频率在固定频率下的超声传播和衰减中进行应用。我们的实施大大简化了高分辨率测量所需的电子设备，可以在单个测量中记录完整的回声列车，并提取随着外部控制参数的函数的eCHA的相位和振幅的提取变化。该系统的操作很简单，需要很少的电气工程知识，并且可以将技术带入广泛的固态物理实验室。我们已经测试了测量Weyl半分NBP中磁性声音量子振荡的设置。将结果直接与使用标准仪器获得的先前结果进行比较。
We describe application of a state-of-the art digital FPGA based Lock-In amplifier to measurements of ultrasound propagation and attenuation at fixed frequency in low temperatures and in high static magnetic fields. Our implementation significantly simplifies electronics required for high resolution measurements, allows to record the full echo train in single measurement and extract changes in both phase and amplitude of an arbitrary number of echa as a function of an external control parameter. The system is simple in operation requiring very little prior knowledge of electrical engineering and can bring the technique to a broad range of solid state physics laboratories. We have tested our setup measuring the magneto-acoustic quantum oscillations in the Weyl semimetal NbP. The results are directly compared with previous results obtained using standard instrumentation.
