201919th International Congress of Metrology
|Number of page(s)||6|
|Section||Mechanics Quantities / Grandeurs Mécaniques|
|Published online||23 September 2019|
Research on an alternative LS2P microphone based on a new reciprocity calibration system
SPEKTRA GmbH Dresden, Research and Development, 01189 Dresden, Germany
2 Federal Institute of Metrology METAS, Acoustic and Vibration, 3003 Bern-Wabern, Switzerland
3 Danish Fundamental Metrology (DFM) A/S, Acoustic, 2970 Hørsholm, Denmark
The microphone calibration by the reciprocity technique specified in IEC 61094-2 is used to determine the sensitivity of laboratory standard microphones according to the IEC 61094-1 with the smallest measurement uncertainty for the use as reference microphones. So far, laboratory standard microphones by the manufacturer Brüel & Kjær (Type 4160 and Type 4180) are almost exclusively used as laboratory reference microphones. In order to create an alternative, the initiative has been taken to examine the usability of the ½-inch laboratory microphones G.R.A.S. 40AU-1. Studies were launched to check the microphone parameters, the stability and the reciprocity of the microphones as well as the compatibility with microphones by Brüel & Kjær. Basis for the investigation was a new validated reciprocity calibration system. The realization of the system and the research results are presented and discussed. Additionally, results of comparison measurements with national metrology institutes are shown in shortened fashion.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.