| 衍射法测量低频液体表面波的衰减系数 |
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| 引用本文： | 时坚,董军,曾祥梅,苗润才.衍射法测量低频液体表面波的衰减系数[J].光学技术,2009,35(3). |
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| 作者姓名： | 时坚 董军 曾祥梅 苗润才 |
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| 作者单位： | 1. 西安邮电学院,电子与信息工程系,西安,710121
2. 陕西师范大学,物理学与信息技术学院,西安,710062 |
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| 基金项目： | 教育部骨干教师资助计划项目，西安邮电学院中青年教师科研基金 |
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| 摘 要： | 提出了一种可用于几百赫兹低频液体表面声波研究的激光衍射法测量新技术。在实验上采用入射光掠入射到表面波上在远场得到了中间亮,两边暗的高反衬度的衍射条纹,实验中发现对频率为几百赫兹的低频衰减液体表面波,当移动振源改变激光入射点与振源间距离时发现零级条纹消失,这意味着此时的衍射效率接近100%。在理论上给出了衍射光强度与表面波振幅的解析关系,并利用所提出的新技术实现了对几百赫兹液体表面波的衰减系数的实时测量。
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| 关 键 词： | 表面声波 光衍射 衰减系数 |
Measurement of the attenuation coefficient of surface acoustic wave by means of the light diffraction |
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| SHI Jian,DONG Jun,ZENG Xiang-mei,MIAO Run-cai.Measurement of the attenuation coefficient of surface acoustic wave by means of the light diffraction[J].Optical Technique,2009,35(3). |
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| Authors: | SHI Jian DONG Jun ZENG Xiang-mei MIAO Run-cai |
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| Institution: | 1.Department of Electronic and Information Engineering;Xian Institute of Posts and Telecommunications;Xian 710121;China;2.School of Physics and Information Technology;Shaanxi Normal University;Xian 710062;China |
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| Abstract: | A practicable method for liquid-surface acoustic-wave at the frequencies of a few hundreds hertz,based on the optical diffraction,is developed.Diffraction pattern which has high contrast can be taken over in the far fields as the light skim through the low frequency wave.The disappearance of the zero-order diffraction fringe,which corresponding to the 100% diffraction efficiency,is observed for using this technique.Moreover,this technique is used to determine the attenuation coefficient of the surface wave ... |
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| Keywords: | surface acoustic-waves light diffraction attenuation coefficient |
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