摘要
本文提出了一个精准测量低频声谱的模型并在该模型基础上搭建了简易的实验装置.该装置利用机械共振原理,通过控制机械振动系统的固有频率,实现了低频声音的频谱测量和低频噪声的监测.装置能够针对100Hz以下的频段进行频率测量,也能够对混合频率声源进行频谱分析,分辨率较高,在40Hz以上可以达到1Hz的分辨率.
A model for the accurate measurement of low frequency sound spectrum is put forward and a simplified experimental device is built. Based on the principle of mechanical resonance, the natural frequency of the system is controlled, which realizes the function of both measuring frequency spectrum and monitoring noises at low frequency. The device is able to measure the acoustic source at a single frequency below 100 Hz as well as to analyze the spectra of acoustic sources at mixed frequencies, with a relatively high resolution of 1 Hz beyond 40 Hz.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第22期339-344,共6页
Acta Physica Sinica
关键词
机械共振
声谱分析
声学传感器
mechanical resonance, acoustic spectrum, acoustic sensor
