摘要
描述了超声波在液体里传播形成超声光栅的原理,指出一维运动的超声波进入液体经反射板反射形成驻波,使液体的密度、折射率和相位等物理性质产生周期性变化,而形成超声相位光栅;进而由折射率周期性变化规律分析了超声光栅衍射法的形成原理,并给出了WSG-I型超声光栅声速仪利用超声光栅衍射法测量水和乙醇声速的方法与实验结果;通过测量因浓度不同引起超声光栅常数的变化,拟合出浓度与光栅常数变化的函数,实现对浓度的测定。
The principle of plane ultrasonic spreading abroad in the liquid coming into being ultrasonic grating,which is described.It is pointed out that the formation of standing wave with the one-dimensional ultrasonic wave after entering into the liquid and reflected by metallic baffle-board makes the liquid properties such as the density,refraction index,and phase vary periodically,which is forming an ultrasonic phase photo-grate;then it is analyzed the formation principle of ultrasonic diffraction grating by the refractive index periodic variety law,and got the method and experiment result of measuring velocity of sound in the water and the ethanol using ultrasonic diffraction grating by the WSG-I type ultrasonic grating instrument.By measuring the change of ultrasonic grating spacing,which is caused by the change of consistency,the function about them will be regressed and the consistency will be measured.
出处
《安徽建筑工业学院学报（自然科学版）》
2010年第1期83-86,96,共5页
Journal of Anhui Institute of Architecture(Natural Science)
关键词
超声光栅
声速
曲线拟合
光栅常数
ultrasonic grating
velocity of sound
regressive curve
grating constant
