摘要
描述了平面超声波在液体里传播形成超声光栅的原理;根据非理想流体对应的连续性方程和Lorentz-Lorenz定律,推导了液体光栅中液体密度与折射率的周期性变化规律,表明液体密度和折射率变化满足相似的驻波方程;根据推导的结果描绘了几个特殊时刻的驻波波形、液体密度、折射率周期性变化之间的关系曲线;进而由折射率周期性变化规律分析了超声驻波自身像的形成原理,并给出了CGS型超声光栅声速仪利用超声驻波自身像测量声速的方法与实验结果.
This paper described the principle of plane ultrasonic spreading abroad in the liquid coming into being ultrasonic grating, educed the density and refractive index changing rule basis continuity equation of not-ideal liquid and Lorentz-Lorenz law, expressing the transformation of the index and refractive index satisfaction similar equation of standing wave, and described the relation curve of the standing wave form at a few special times, liquid density and refractive index periodic variety according to the result; then it analyzed the formation principle of ultrasonic self-picture by the refractive index periodic variety law, and gave the method and experiment result of measuring velocity of sound in liquid using self-picture of ultrasonic standing wave by the CGS type ultrasonic grating instrument.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第6期135-138,共4页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(60471042)
关键词
超声光栅
声速
原理与方法
实验结果
ultrasonic grating
vocal velocity
principle and method
experiment result
