基于阴影法的超声驻波成像和声速测量
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摘要
本文提出了利用阴影法观察声光晶体中的超声驻波图像并利用该图像测量超声波在晶体中传播速度的方法,并将其与传统的声光衍射方法进行对比,分析了两者各自的优缺点。本方法可以直接观察到晶体内部由超声驻波造成的介质密度周期性分布图像。利用该方法测得的超声波波速与利用衍射方法测得的波速精确度相当,但这种方法使用的仪器更简单,并有利于更直观地理解超声驻波在声光晶体中的传播,同时也有助于加强实验者对阴影法的认识。
The observation of ultrasonic standing wave in acousto-optic crystal with the method of shadowgraph,which leads to a new method in acoustic velocity measuring,is discussed in this paper.Besides,this new method is compared with the traditional way of measuring which is based on acousto-optic diffraction,and the pros and cons are analyzed in this paper.With this new method,the periodical distribution caused by the ultrasonic standing wave can be straightly observed in the crystal.The precision of this new method can match the traditional one based on diffraction phenomenon,but it takes simple devices and helps to have a more intuitive understanding of the spreading of ultrasonic standing wave in acousto-optic crystal,as well as the shadowgraph system.
The observation of ultrasonic standing wave in acousto-optic crystal with the method of shadowgraph,which leads to a new method in acoustic velocity measuring,is discussed in this paper.Besides,this new method is compared with the traditional way of measuring which is based on acousto-optic diffraction,and the pros and cons are analyzed in this paper.With this new method,the periodical distribution caused by the ultrasonic standing wave can be straightly observed in the crystal.The precision of this new method can match the traditional one based on diffraction phenomenon,but it takes simple devices and helps to have a more intuitive understanding of the spreading of ultrasonic standing wave in acousto-optic crystal,as well as the shadowgraph system.
引文
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[2]李明,李冠成.声光效应实验研究[J].应用光学,2005,26(6):23-27.LI Ming,LI Guancheng.Experimental investigation of acousto-optic effect[J].Journal of Applied Optics,2005,26(6):23-27.(in Chinese)
[3]阮立锋,唐志列,刘雪凌.基于傅里叶分析的拉曼-奈斯声光衍射光强分布的研究[J].光学学报,2013,33(3):90-95.RUAN Lifeng,TANG Zhilie,LIU Xueling.Investigation on light intensity distribution of Raman-Nath acousto-optic diffraction based on Fourier analysis[J].Acta Optica Sinica,2013,33(3):90-95.(in Chinese)
[4]徐介平.声光器件的原理、设计和应用[M].北京:科学出版社,1982.
[5]诸国桢,杨旭辉,傅德永.用阴影法观察水声模型的声场[J].应用声学,2001,20(1):11-14.ZHU Guozhen,YANG Xuhui,FU Deyong.Visualization of the acoustic field of seabed model by a shadowgraph[J].Applied Acoustics,2001,20(1):11-14.(in Chinese)
[6]DAVIDHAZY A.Introduction to shadowgraph and schlieren imaging[EB/OL].2006.http://scholarworks.rit.edu/article/478.
[7]李朝荣,徐平,唐芳,等.基础物理实验[M].北京:北京航空航天大学出版社,2010.
[8]李武军,王晓颖.声光Naman-Nath衍射特性的研究[J].大学物理,2009,28(9):25-27.LI Wujun,WANG Xiaoying.Study of the acoustic-optic Naman-Nath diffractive characteristic[J].College Physics,2009,28(9):25-27.(in Chinese)
[9]刘海霞,盖磊,刘光娟,等.声光衍射及实验研究[J].实验室研究与探索,2009,28(1):62-65.LIU Haixia,GAI Lei,LIU Guangjuan,et al.The principle of acousto-optic diffraction and experimental research[J].Research and Exploration in Laboratory,2009,28(1):62-65.(in Chinese)
[10]于艳春,李冠成,王秉坤,等.声光效应实验装置及实验研究[J].光学仪器,2004,26(6):52-57.YU Yanchun,LI Guancheng,WANG Binkun,et al.Studies on the experiment and experiment in stallation of acousto optic effect[J].Optical Instruments,2004,26(6):52-57.(in Chinese)