液体驻波演示仪的研制和应用  

Development and application of liquid standing wave demonstration instrument

作　　者：刘国高[1] 陈秉岩[1] 梁星慧[1] 孙雨[1] 王万方[1] 李庆武[1] 

机构地区：[1]河海大学,江苏常州213022

出　　处：《物理实验》2008年第9期15-18,29,共5页Physics Experimentation

基　　金：国家大学生创新训练计划项目(XZX/CGA016-6;XZX/C2007028);河海大学自制实验仪器项目(XZX/07A001-01)

摘　　要：根据驻波形成的原理及其特点,利用MCU,DDS,LPF等产生频率和相位可数控调节、频率稳定性较好的大功率DDS信号源,使用该功率信号驱动由扬声器、声波汇聚器、有机玻璃管和少量液体组成的驻波演示管.在驻波演示管内,由扬声器发出的行波和反射面形成的反射波干涉形成物理模型清晰的驻波.According to the principle and characteristic of the formation of standing wave, the authors have developed a standing wave demonstration tube, which consists of loudspeaker, sonic focusing vessel, organic glass and a little liquid driven by the high power DDS signal. The frequency and phase of the highly stabilized signal, which is produced by MCU, DDS, LPF, can be numerically adjusted. The interference of the incoming and reflected sound waves forms clear standing wave pattern in the tube.

关 键 词：驻波 DDS MCU LPF 液体 

分 类 号：O4-39[理学—物理]