一种声控发光驻波管测量声速的分析  

Analysis of the measurement of acoustic velocity through an acoustic controlled standing wave tube

作　　者：张波[1] 刘向远 赵敏福[1] 方杰 张刚 孔敏 袁好 ZHANG Bo;LIU Xiang-yuan;ZHAO Min-fu;FANG Jie;ZHANG Gang;KONG Min;YUAN Hao(Center of Experiments and Practice,West Anhui University,Luan,Anhui 237012,China;School of Electrical and Photoelectronic Engineering,West Anhui University,Luan,Anhui 237012,China)

机构地区：[1]皖西学院实验实训中心,安徽六安237012 [2]皖西学院电气与光电工程学院,安徽六安237012

出　　处：《大学物理》2019年第8期26-29,38,共5页College Physics

基　　金：安徽省教育厅重点科研项目(KJ2017A406);皖西学院校级重点项目(KJ103762015B23);皖西学院校级质量工程(wxxy2017119)资助;安徽省高校优秀青年骨干教师国内访学重点项目(gxfxZD2016193);安徽省省级质量工程(2016gxx153,2016jyxm1101)

摘　　要：声控发光驻波管由透明亚克力管、声控发光单元阵列、声波换能器、硬质端盖和支架组成.通过信号发生器提供声源信号,驻波管内空气的振动叠加能够产生类似于驻波状态.理论分析表明这种驻波状态与理想驻波的波节和波腹位置相一致,因此,能够用于测量声波的波长.驻波管用于实验测量声速,精细调节信号源频率和振幅,通过LED的亮度显示,能够获得清晰的声压波节和波腹.实验测量表明,使用声控发光驻波管测量声速具有操作简便、准确的优点.The acoustic controlled standing wave tube is composed of a transparent acrylic tube,a unit lighting array controlled by acoustic wave,a acoustic wave transducer and a hard end cover and holders.When the acoustic wave signals are provided to the acoustic wave transducer,the similar standing wave states are formed in the transparent acrylic tube due to the wave superposition.The theoretical analysis has shown that this standing wave has wave nodes and loops and is in agreement with that of the ideal standing wave.Therefore,this standing wave tube can be used to measure the wavelength of acoustic waves.With the acoustic controlled standing wave tube,by carefully adjusting the frequency and amplitude of the acoustic wave signals,the wave nodes and loops are able to be clearly displayed by the LED brightness.The experimental results have revealed that the measurement of acoustic velocity with such standing wave tube has advantages of accuracy and simplicity for operators.

关 键 词：声控发光驻波管 LED显示 驻波状态 声速测量 

分 类 号：O429[理学—声学] O4-33[理学—物理]