摘要
利用平面声波在管内形成驻波,根据管口声阻抗公式推导了驻波发生时相邻共振频率之差与管道长度的定量关系,利用自制装置实现了管道(直管、弯管)长度的测量,测量误差均在1.5%以下.
Based on the standing wave formed in the pipeline, the relation of the pipeline length and the difference between the adjacent resonant frequencies was derived from acoustic impedance formula of pipeline end. Then the length of the pipeline was determined using microcontroller. The instrument could measure the length of both straight pipeline and bend pipeline. The test results showed that the relative errors were less then 1.5%.
出处
《物理实验》
2012年第5期28-30,共3页
Physics Experimentation
关键词
驻波
共振频率
管道长度
standing wave
resonant frequency
pipeline length
