RePCal: software for calculation of quantities required for Reciprocity pressure Calibration of microphones in couplers

What is RePCal ?

RePCal is a COM object developed by the LNE providing a set of functions for calculation of quantities required for Reciprocity pressure Calibration of microphones in couplers. These includes the calculation of parameters of air and the acoustic transfer admittance of a plane wave coupler according to the standards IEC 61094-2:2009, IEC 61094-2:2009/AMD1:2022 and the new formulations provided in the reference D. Rodrigues et al. Metrologia 2023. RePCal includes especially the general analytical solution provided in this reference, an unified formulation of the acoustic transfer admittance of cylindrical cavities relevant for reciprocity calibration of LS microphones in the widest frequency range, and not restricted by any assumption about the relative size of the wavelength and coupler dimensions.

RePCal has been developed for 64-bit Windows operating computers. It implements a Microsoft Component Object Model (COM) server by creating a Python interface, registered in the Windows Registry. When the COM object up and running, any automation-capable language, such as Python, Visual Basic, Delphi, or Perl, can use it.

An example of integration in a Excel worksheet with VBA macros is provided.

Documentation

Réferences

 [1] IEC 61094-2:2009. Measurement microphones-Part2: Primary method for the pressure calibration of laboratory standard microphones by the reciprocity method. IEC standard, 2009.

[2] IEC 61094-2:2009/AMD1:2022. Amendment 1 –- Measurement microphones-part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique. IEC standard, 2022.

[3] D. Rodrigues, P. Vincent. Toward a unified formulation of the acoustic transfer admittance of cylindrical cavities for reciprocity calibration of microphones. Metrologia, 2023. DOI 10.1088/1681-7575/ace3c4.