0.1~20Hz低失真度激光活塞发声器的设计与实现

发布时间：2018-01-10 02:11

本文关键词：0.1~20Hz低失真度激光活塞发声器的设计与实现　出处：《声学学报》2016年03期 　论文类型：期刊论文

【摘要】：为实现次声频段传声器的准确校准,研制了低失真、低泄漏的激光活塞发声器。激光活塞发声器采用具有空气轴承和位移反馈控制的超低频振动台驱动的活塞-腔体组合获得低失真度的声压信号;采用气浮自对中技术的小间隙缸塞配合以及大体积的腔体设计,获得了低泄漏的活塞发声器。在0.1~20 Hz,声压波形总谐波失真低于0.8%,实现高达50 s的腔体泄漏时间常数,使其适用于更低频段的传声器校准。在0.1~20 Hz频率范围内,激光活塞发声器的测量不确定度不超过0.58 dB(k=2)。与耦合腔互易法、关联传声器法的比较结果表明,激光活塞发声器法获得的传声器灵敏度与其他方法之间具有很好的一致性。
[Abstract]:In order to achieve the accurate calibration of infrasound microphone, a low distortion is developed. Low leakage laser piston sound generator. The laser piston sound generator adopts the combination of piston and cavity driven by ultra-low frequency vibration table with air bearing and displacement feedback control to obtain the low distortion sound pressure signal. The piston sound generator with low leakage is obtained by using the small clearance cylinder plug fit of air floatation self-aligning technique and the design of large volume cavity. The total harmonic distortion of sound pressure waveform is less than 0.8% at 0.1 Hz. The cavity leakage time constant of up to 50 s is realized, which makes it suitable for the microphone calibration in lower frequency band, in the frequency range of 0.1 ~ 20 Hz. The measurement uncertainty of the laser piston generator is not more than 0.58 dBmK ~ (2 +). The comparison with the coupled cavity reciprocity method and the correlation microphone method shows that the method is effective. The sensitivity of the microphone obtained by the laser piston sound generator method is in good agreement with other methods.
【作者单位】：中国计量科学研究院力学与声学所;浙江大学浙江省先进制造技术重点研究实验室;
【基金】：国家质检总局量值传递专项(ALC1107) 国家自然科学基金(51375443,51205378,51575502)资助
【分类号】：TN641
【正文快照】： 次声传感技术在大气监测、军事领域、环境安全等方面有着广泛的应用,传感器的校准是实现次声精确测董的前提。低频传声器的校准最为常用的方法包括:静电激励法、耦合腔互易法和活塞发声器法。静电激励法在低频段由于受到大气环境的影响,需要将装置放置在真空环境中才能获得

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