利用光强判别法改进超声光栅测量水中声速实验  

Improvement of measuring sound velocity in water using ultrasonic grating by light intensity measuring method

作　　者：董玮涔 何旭东 DONG Wei-cen;HE Xu-dong(Department of Physics,Beijing Normal University,Beijing 100875,China)

机构地区：[1]北京师范大学物理学系,北京100875

出　　处：《物理实验》2020年第12期39-43,共5页Physics Experimentation

摘　　要：介绍了超声光栅形成原理及如何利用该原理测量液体中的超声速度.采用光强判别法测量了非0级条纹光强极大时的超声频率,并利用Matlab拟合计算出水中超声速度为1460 m/s,较传统的分光计测角法更精确.The principle of ultrasonic grating and how to measure the ultrasonic velocity in liquid with this principle were introduced.Using the light intensity measuring method,the ultrasonic frequency was measured when the light intensity of non-zero fringe was maximum.The ultrasonic velocity in water was calculated to be 1460 m/s by LabVIEW,and was more accurate than the traditional angle-measurement method with spectrometer.

关 键 词：超声光栅 声速 光强判别法 LABVIEW 

分 类 号：O422.1[理学—声学] O436.1[理学—物理]