声速测量实验中入射波幅值变化的研究  

Study on the Variation of Incident Wave in Ultrasound Wave Speed Measurement Experiment

作　　者：杨建伟 于轲鑫 郑宇彤 史旭光 YANG Jian-wei;YU Ke-xin;ZHENG Yu-tong;SHI Xu-guang(Beijing Forestry University,Beijing 100083)

机构地区：[1]北京林业大学,北京100083

出　　处：《大学物理实验》2018年第5期53-56,共4页Physical Experiment of College

摘　　要：超声波声速测量实验中,可以用连续波法测量声速。在测量波长时,主要是使用驻波法和相位法。两种方法都是测量的换能器S2的电信号,只是驻波法观察示波器的ch2通道。相位法是将扫描时间旋钮放到X-Y模式。文献和教材中对于换能器S2处的振动成分未作详细分析。本文将入射超生波的振幅进行了分解,得到在换能器S2处的振动成分为驻波引起振动和平面波引起振动,解释了以上两种方法的原理。并通过实验近似的分析了换能器S2处的入射波幅值和反射波幅值。In the uhrasonie sound velocity measurement experiment,the sound velocity can De measured by the continuous wave method.In measuring the wavelength ,the main method is to use the standing wave and phase method.Both methods measure the electrical signal from transducer S2, except that the standing wave method observes the oscilloscope＇s ch2 channel.Phase method is the scan time knob into the X-Y mode.There is no detailed analysis of the vibrational components at transducer S2 in the literature and textbooks. In this paper, the amplitude of the incident super-wave is decomposed, and the vibration component caused by the standing wave and the vibration caused by the plane wave are obtained.The principle of the above two methods is explained.The incident wave amplitude and the reflected wave amplitude at the transducer S2 are analyzed by experiments.

关 键 词：声速测量 相位法 驻波法 

分 类 号：O4-34[理学—物理]