论文标题
莫斯鲍尔光谱研究研究的粉末振动
Powder vibration studied by Mössbauer spectroscopy
论文作者
论文摘要
Mössbauer光谱法用于研究颗粒材料的超声振动。将一堆粉末放在用12.68 MHz振动的压电传感器表面上。晶粒的大小（1.3 $μ$ m）比超声波的波长小得多，但远比振动幅度大得多。由于振动，Mössbauer透射光谱的单线被分为梳子结构，其周期等于振动频率。该频谱包含有关颗粒动力学中快速和慢模式的信息。我们开发了一种方法，该方法允许测量颗粒材料中超声的衰减，并估算桩中颗粒对流的结果。
Mössbauer spectroscopy is applied to study ultrasound vibration of a granular material. A pile of powder is placed onto the surface of piezo transducer vibrated with the frequency 12.68 MHz. The size of grains (1.3 $μ$m) is much smaller than the wavelength of ultrasound, but much larger than the vibration amplitude. Due to vibration a single line of the Mössbauer transmission spectrum is split into a comb structure with a period equal to the vibration frequency. This spectrum contains the information about fast and slow modes in granular dynamics. We developed a method which allows to measure decay of ultrasound in the granular material and to estimate the results of the particle convection of grains in the pile.
