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作 者:王逸君 刘亮[1] 郑湘粤 刘恒彪[1] WANG Yijun;LIU Liang;ZHENG Xiangyue;LIU Hengbiao(School of Physics Science and Engineering,Tongji University,Shanghai 200092,China)
机构地区:[1]同济大学物理科学与工程学院,上海200092
出 处:《物理实验》2023年第2期38-44,共7页Physics Experimentation
基 金:同济大学第十五期实验教学改革专项基金项目(No.53)。
摘 要:为将半导体激光器用于构建声光效应及声速声强测量教学实验装置,推导了超声光栅远场衍射光场分布,给出了超声光栅相位调制系数分别与声强和各级衍射光强度的关系,总结了从衍射光场图像提取声强值的数据处理方法.通过建立交替使用氦氖激光器或半导体激光器的实验系统,进行了液体中超声声强测量的比较实验,验证了半导体激光器作为光源实现声光衍射法超声声强测量的可行性.In order to apply the semiconductor laser to the construction of teaching experiment device based on the acousto-optic effect and the measurement of sound speed and intensity,the light field distribution of the far-field diffraction induced by the ultrasonic grating was deduced.The relationship between the phase modulation coefficient of the ultrasonic grating and the sound intensity,and the relationship between the phase modulation coefficient and the intensity of the diffracted light at various orders were deduced.Furthermore,the data processing method for calculating the ultrasonic intensity from the image of the diffracted light field was summarized.By establishing the experimental system,in which He-Ne laser or semiconductor laser was alternately selected,the comparative experiment on ultrasonic intensity measurement in liquid was carried out.The feasibility of using semiconductor laser as the light source to realize the measurement of ultrasonic intensity based on acousto-optic effect was experimentally verified.
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