共查询到18条相似文献,搜索用时 109 毫秒
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利用多普勒效应来测量声速是大学物理中的一个重要的实验。本文介绍了设计性实验"超声多普勒效应测量声速",利用多普勒效应综合实验仪,设计出一套超声多普勒效应测量声速的实验装置,并利用该实验装置测量声速。 相似文献
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针对原有声速测量仪中存在的不足,利用单片机、步进电机等器件构建控制电路,通过识别信号强度强弱变化来代替原有实验仪中手动操作,提高了实验精度. 相似文献
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在利用近场超声悬浮技术搬运晶圆的过程中,为提高近场超声悬浮力,该文研究了气体物理性质与近场超声悬浮力之间的关系。利用声辐射压理论与流体力学理论对不同气体介质下的悬浮力进行建模与求解。搭建了可测量不同气体环境中悬浮力的实验平台。实验发现氩气环境下超声悬浮力平均值相对空气环境下提升24.8%。结合实验与理论计算分析了气体密度、比热容比、声速与动力黏度对悬浮力的影响,推断气体的比热容比为影响近场超声悬浮力的主要参数。该方法为晶圆搬运的环境适用性提供了参考价值。 相似文献
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声波在浓悬浮液中的传播 总被引:2,自引:0,他引:2
本文从理论上与实验上研究了纯高岭土悬浮液中的声传播问题。在理论上考虑了悬浮粒子在声场中的电力相互作用与流体动力相互作用,对Ahuja的理论作了些改进;在实验上我们测量了在室温条件下声速和声振幅吸收系数对频率的依赖关系。理论与实验的一致性是相当好的。 相似文献
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介绍了设计性实验"多普勒效应测量声速."该实验要求学生理解多普勒效应测量声速的原理,利用气垫导轨实验和声速的测定实验仪器,设计出一套多普勒效应测量声速的实验装置,并利用该实验装置测量声速. 相似文献
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The reciprocity measurement theory in anomalous reverberant sound fields was investigated.An improved method Was proposed due to the interrelated errors.The source volume velocity Was corrected by spatial average of measurement results and evaluation of the reverberant sound field influence on acoustic energy density.The result was validated in underwater experiment,corrected reciprocity measurement results were almost the same as direct measurement results.It indicates that reverberant sound field does not affect the validitv of the principle,but influences the obtainment of source volume velocity,then influences the measurement of transfer functions with the principle.The proposed method is simple and effective in anomalous reverberant sound fields.The study mav be valuable for the applications which are based on the principle. 相似文献
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The superposition dynamics of two confronting ultrasonic waves and their levitation capability for centimeter-sized thin disks are investigated by numerical analyses and validated by experiments. The sound pressure simulation reveals that two opposite ultrasonic waves provide a more effective standing-wave field than a single ultrasonic wave when the diameter of disk-shaped object approaches the wavelength scale. The dynamic superposition of two confronting beams facilitates the acoustic levitation of the clay disk and aluminum disk with diameters of 0.97 and 0.90. The acoustic radiation forces exerting on these thin disks are measured experimentally, which exhibit a better levitation stability for the centimeter-sized thin disks. The equilibrium levitation positions of the two disks are located near the sound pressure node, and the maximum acoustic radiation pressure on their surfaces is less than one percent of the maximum sound pressure. 相似文献
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