摘要
将“空气中声速测量”实验和“薄透镜焦距测量”实验融合,设计了集声学原理和光学原理的“菲涅耳声透镜”实验,明确了该实验所使用的实验仪器,给出了实验内容,即测量声透镜的焦距、通过测量声透镜的几何参量得出超声波的波长、测量超声波在空气中的声速.最后,制作了焦距f为50 mm的声透镜,并对实验内容进行了可行性分析及实验验证.实验结果(声透镜的焦距为50.3 mm及超声波波长值8.70 mm)与理论设计值基本一致.
Experiment of Fresnel acoustic lens based on the acoustic and optical principle was designed,which integrated the experiments of measuring sound velocity in the air and measuring the focal length of thin lens.The experimental instruments was introduced,and the experiment contents were provided,including measuring the focal length of the acoustic lens,calculating the wave length of the ultrasonic wave by measuring the geometric parameters of the acoustic lens,and measuring the ultrasonic velocity in the air.Finally,an acoustic lens with a focal length of f=50 mm was fabricated,and the feasibility analysis and experimental verification of the three experimental contents were carried out.The experimental results(the measured focal length of the acoustic lens was 50.3 mm and the ultrasonic wavelength was 8.70 mm)were almost consistent with the theoretical value.
作者
唐召军
黄魏
周小虎
吴晓立
樊代和
TANG Zhao-jun;HUANG Wei;ZHOU Xiao-hu;WU Xiao-li;FAN Dai-he(No.7 High School of Chendu,Chengdu 610041,China;School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China)
出处
《物理实验》
2020年第2期27-30,共4页
Physics Experimentation
关键词
菲涅耳声透镜
声速
透镜焦距
Fresnel acoustic lens
sound velocity
focal length
