Communication Dans Un Congrès Année : 2020

Next steps in development of transfer impedance calculation of couplers for reciprocity calibration of laboratory standard microphones

Résumé

The most accurate method to establish primary sound pressure standards at medium and low frequencies is pressure sensitivity reciprocity calibration of Laboratory Standard, LS, microphones, with LS microphones and the calibration method standardized in international standards IEC 61094-1 and IEC 61094-2. However, for some years it has been increasingly clear that the calculation of the acoustic transfer impedance of couplers, as described in the standard, needs improvement. Recently, Vincent et. al. suggested a solution to the calculations for low frequencies, reconsidering the background of the full low frequency solution quoted in the standard, and there is consensus that this solution is correct and accurate for cylindrical couplers at low frequencies where uniform pressure in the couplers can be assumed. At higher frequencies this assumption is not fulfilled, and the subject of this presentation is a review of the transfer impedance calculations at medium and high frequencies. The assumptions of the calculations are discussed, numerical calculations of the acoustic field and the microphone diaphragm movement are utilized, and the interaction between the results and calculation of the resulting acoustical transfer impedance are discussed.

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Dates et versions

hal-03231903 , version 1 (21-05-2021)

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Erling Sandermann Olsen. Next steps in development of transfer impedance calculation of couplers for reciprocity calibration of laboratory standard microphones. Forum Acusticum, Dec 2020, Lyon, France. pp.2233-2239, ⟨10.48465/fa.2020.1023⟩. ⟨hal-03231903⟩

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