Abstract: The requirement of infrasound calibration is increasing,but the traditional reciprocity calibration method is easily influenced by gas leakage in low frequency and its calibration result is not good. The new method called laser pistonphone calibration is more suitable for infrasonic microphone calibration.This paper designs a laser pistonphone calibration system based on virtual instrument.The system employs ultra-low frequency technology.The distortion of the piston displacement is very small. The SPL(sound pressure level)in the cavity is stable and large-scale.The software design of the system is flexible and convenient.After sound pressure feedback is introduced,a sound source with stable SPL can be achieved.

Key words: laser pistonphone, virtual instrument, infrasound calibration

摘要： 随着次声校准的需求越来越多,而传统的互易法校准在低频段受气体泄漏影响很大,校准效果不好,新式的激光式活塞发声腔校准法更适用于次声传声器校准。设计并实现了一套基于虚拟仪器的激光式活塞发声腔校准系统,采用超低频振动台技术,其活塞位移失真度很小,腔体中声压级稳定,声压级范围大。校准系统的软件设计灵活方便,加入声压反馈后能得到声压级很稳定的声源。

关键词: 激光式活塞发声器, 虚拟仪器, 次声校准