| Zugriffsnummer | 28802 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Diffuse-field reciprocity calibration of measurement microphones |
| Autor(in); Institution |
Weihe, Simon; Jade-Hochschule, Oldenburg, GERMANY
Wittstock, Volker; 1.7, Akustik und Dynamik, PTB-Braunschweig
Blau, Matthias; Jade-Hochschule, Oldenburg, GERMANY
|
| Quelle/Jahr | AIA-DAGA 2013 : proceedings of the International Conference on Acoustics:(2013), 650 - 653 |
| Availability | [CD-ROM] ; file name: 000113.pdf |
| ISBN | 978-3-939296-05-8 |
| Verlag | Berlin: DEGA |
| Konferenzangaben | AIA-DAGA 2013, International Conference on Acoustics, including the 39th German Annual Conference on Acoustics, Merano, 18-21, March, 2013, Italy |
| Freie Schlagworte | diffuse field ; reciprocity calibration ; random incidence sensitivity ; scale model reverberation |
| Zusammenfassung | The primary calibration of measurement microphones is performed by reciprocity technique where microphones act as sound source and as receiver. The ratio between acoustic and electric quantities is identical in both directions. Therefore, the sensitivity of microphones can be determined by measuring the input current into the sending microphone and the output voltage of the receiving microphone. Additionally, the properties of the acoustic field must be known. The technique requires the use of three microphones where each microphone is used once as emitter and once as receiver. This method is standardised in pressure and in free-fields. The application in diffuse sound fields is more difficult to implement. The reason is that the source strength of a microphone is too small to excite a reverberation room of about 200 m³ with a measurable sound pressure. Therefore, a scaled model of a reverberation room with a volume of 0.23 m³ is used at PTB to implement the method. The diffuse field correction is of interest for frequencies above 1 kHz. The scaled reverberation room is expected to provide an approximate diffuse sound field in this frequency range. The measurement setup, measured sensitivities and comparisons to known random incidence sensitivities will be presented. |
