| Issue |
Acta Acust.
Volume 7, 2023
|
|
|---|---|---|
| Article Number | 50 | |
| Number of page(s) | 8 | |
| Section | Environmental Noise | |
| DOI | https://doi.org/10.1051/aacus/2023048 | |
| Published online | 20 October 2023 | |
Technical & Applied Article
Calibration and testing of measurement devices at infrasound frequencies: proof from malfunctioning devices at site
1
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
2
Acoustic Sensor Networks, St Andrews Church, Warninglid RH17 5UB, UK
* Corresponding author: christoph.kling@ptb.de
Received:
18
January
2023
Accepted:
6
September
2023
With the growing prevalence of infrasound and potential for annoyance comes the need for noise assessment. Performance validation of measuring instruments is an established necessity for reliable measurement data at conventional frequencies. However, infrasound measurements are critically dependent on the integrity of the microphone. A case study is presented showing that errors in excess of 20 dB result if the microphone diaphragm is perforated, and that such a defect cannot be detected by visual examination or with a typical sound calibrator. A further laboratory study validates the findings, and a scheme is proposed for identifying when such an issue exists.
Key words: Infrasound / Sound pressure measurement / Measurement microphones / Noise assessment
© The Author(s), Published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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