基于气体状态方程的次声声压源的研究与实现  

Research and realization of infrasound pressure source based on the gas state equation

作　　者：何龙标[1] 何闻[2] 杨平[1] 牛锋[1] 钟波[1] 

机构地区：[1]中国计量科学研究院力学与声学研究所,北京100013 [2]浙江大学机械工程系,杭州310027

出　　处：《电子测量与仪器学报》2013年第7期589-595,共7页Journal of Electronic Measurement and Instrumentation

摘　　要：次声技术的应用对次声传感器的校准提出了新的需求,为建立一个具有高稳定性、低失真度的参考次声源,根据理想气体状态方程,设计并实现了基于激光式活塞发声器的次声声压源。采用超低频振动台技术,通过位移反馈控制和虚拟仪器技术,获得了低失真度、大动态范围、高稳定性的次声声压源。实验结果表明,5～20 Hz时,基于气体状态方程原理的计算声压值与互易法获得声压灵敏度的传声器计算值相差不超过0.04 dB。1～20 Hz范围内124 dB声压级的失真不超过0.7%,不确定度为0.04～0.22 dB。The calibration of infrasonic sensor is widely needed with the application of infrasound technology. To make a reference infrasound source with good reproducibility and low distortion, the infrasound pressure source based on the gas state equation and the laser piston-phone technology is built. The low vibrator technology and the displacement feedback system ensure the reference sound source with low distortion, wide dynamic range and good reproducibility. The test results show that the difference between the calculated value of the reference source and the measured value by the laboratory standard microphone is no more than 0.04 dB from 5 to 20 Hz, and from 1 to 20 Hz, the distortion of the sound pressure is no more than 0.7% , the uncertainty of sound pressure level is 0.04 dB to 0.22 dB.

关 键 词：次声 参考声压 活塞发声器 失真度 

分 类 号：TB522[理学—物理]