A laser pistonphone system capable of measuring the sensitivity modulus and phase of microphones is proposed. For the primary vibration calibration, the sine-approximation method has been applied which is used to calculate the complex sensitivity of accelerometers. This method is based on a laser interferometer with quadrature output instead of the fringe-counting method that is used in conventional laser pistonphones. Here, the laser pistonphone system based on the sine-approximation method with the quadrature signal is proposed and the measured results are compared to those obtained by the reciprocity method. The measured sensitivity with the proposed method agrees well with the result of the reciprocity method for the infrasound range. However, in case of the phase sensitivity, the discrepancy is relatively high in comparison to the sensitivity modulus. The results show that the proposed system is capable of calibrating the complex sensitivity of microphones. The improvement of the uncertainty and extension of the frequency range can be achieved by modification of the excitation system for obtaining the required stable excitation with long stroke.

提出了一种能够测量麦克风的灵敏度模数和相位的激光活塞式电话系统。对于一次振动校准，已采用正弦近似方法，该方法用于计算加速度计的复数灵敏度。此方法基于具有正交输出的激光干涉仪，而不是传统激光活塞式电话中使用的条纹计数方法。在此，提出了基于正交信号的正弦逼近法的激光活塞式电话系统，并将测量结果与通过互易法获得的结果进行比较。所提出的方法测得的灵敏度与次声范围的互易方法的结果非常吻合。但是，在相位灵敏度的情况下，与灵敏度模量相比，差异相对较高。结果表明，所提出的系统能够校准麦克风的复杂灵敏度。不确定性的改善和频率范围的扩展可通过修改励磁系统来获得，以获得长行程所需的稳定励磁。