Quantum Measurement Division, Physical Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.
Department of Mechanical Engineering, Temple University, 1947 North 12th Street, Philadelphia, Pennsylvania 19122, USA
JASA Express Lett. 2021 Aug;1(8):082803. doi: 10.1121/10.0005919.
A precision laser-based comparison calibration method for laboratory standard microphones is described that uses reference microphones calibrated by the pressure reciprocity method. Electrical drive current and diaphragm velocity are measured while the microphones are driven as transmitters/sources of sound; the diaphragm velocity is measured using scanning laser Doppler vibrometry. Sensitivities determined using this method display very good agreement with those determined directly by reciprocity for seven such test microphones at 250 and 1000 Hz. At these frequencies, the expanded (coverage factor k = 2) uncertainties of this comparison calibration method for these microphones are ±0.05 dB.
介绍了一种基于精密激光的实验室标准传声器比较校准方法，该方法使用压力互易法校准的参考传声器。当传声器作为声音的发射器/声源驱动时，测量电驱动电流和振膜速度；使用扫描激光多普勒测振仪测量振膜速度。在 250Hz 和 1000Hz 下，对七个这样的测试传声器进行了测量，用这种方法确定的灵敏度与互易法直接确定的灵敏度非常吻合。在这些频率下，这些传声器的比较校准方法的扩展（覆盖因子 k = 2）不确定度为±0.05dB。
