关键词: 分立推挽, 次声, 教学实验

Abstract: In college physics experiment，experiment on sound is less，more common is the use of the characteristics of ultrasonic wave to measure the sound velocity，and the study of infrasound source and the acoustic field distribution are rare. The“separation of push-pull flow modulation”infrasound generator we designed can do experiments of infrasound source and relevant acoustic field measurement，which can make students understand the characteristics of infrasound，the mechanism of energy conversion of the air-modulated infrasound source，and the basic method of sound field measurement. Using MATLAB to analyze the data measured in experiments and COMSOL to do sound field numerical simulation，can make the students know the distribution of sound field and 　　directivity of the sound source. Thus which can broaden the students’knowledge，improve the students’ability of experiment and data processing and analysis.

Key words: separated push-pull, infrasound, instructional experiment