大学物理 ›› 2012, Vol. 31 ›› Issue (5): 50-50.

• 著者文摘 • 上一篇    下一篇

超声光栅实验中声致折射率变化的研究

王晓颖[1] 王涛[2] 李武军[1]   

  1. [1]西安工业大学理学院,陕西西安710032 [2]西安应用光学研究所,陕西西安710065
  • 出版日期:2012-05-25 发布日期:2012-05-20

The study of the refractive index increment on the ultrasonic grating experimentation

  • Online:2012-05-25 Published:2012-05-20

摘要: 为了研究声光效应中声致折射率变化情况,以超声光栅实验为基础,用CCD结合光强分析软件,分析了衍射光的强度分布;通过数值计算衍射光相对强度,比较得到了在超声场频率为10.27 MHz时,介质中的声光相位延迟Δ=1.2855 rad,声致折射率变化量Δn=3.014×10-6;进而讨论了电声换能器的机电耦合效率与超声频率的关系,给出当超声频率为10.33 MHz时,耦合效率最高,介质中折射率变化量最大;结果表明,在超声光栅实验中,引入这些测量内容,不仅能丰富实验内容,更能加深学生理解声光效应,扩展学生的知识面.

关键词: 超声光栅, 衍射, 强度分析, 折射率

Abstract: In order to study the refractive index change of the acoustic-optic effect,the intensity distribution of the diffraction spectrum is analyzed by CCD image disposal based on ultrasonic grating experimentation.The phases delay Δ=1.2855 rad and the refractive index increment Δn=3.014×10-6 are obtained by the comparative numerical calculating value on the ultrasonic frequency 10.27MHz.The relation of the piezoelectricity coupling effciency with ultrasonic frequency is discussed,the most coupling efficiency value and the most refractive index increment are obtained for ultrasonic frequency 10.33MHz.The results show that this content can not only enrich experimentation content but can also grow on comprehend acoustic-optic effect on the ultrasonic grating experimentation.

Key words: ultrasonic grating, diffraction, intensity analysis, refractive index

中图分类号: 

  • O436.1