Abstract
Measurement microphones are typically calibrated in a free field at frequencies up to 50 kHz. This is a
sufficiently high frequency for the most sound measurement applications related with noise assessment.
However, other applications such as the measurement of noise emitted by ultrasound cleaning machines and
failure detection in aeronautic structures require that the sensitivity of the microphone is known at
frequencies up to 150 kHz. Another area of particular interest is the investigation of the perception
mechanisms of ultrasound. In any of these applications, it is of fundamental importance to establish a
well-defined traceability chain to support the measurement results. In order to extend the frequency range of
free-field calibration the measurement system and measurement methods must undergo a series of changes
and adaptations including the type of excitation signal, techniques for eliminating unwanted reflections from
walls, cross-talk, etc. This paper presents the results of an investigation of the calibration of measurement
microphones at high frequencies. A strategy for the changes and adaptations to the existing measurement
methodologies, and the determination of the microphone parameters is outlined and the results of its
implementation are discussed
Original language | English |
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Title of host publication | Proceedings of inter.noise 2013 |
Number of pages | 9 |
Publication date | 2013 |
Publication status | Published - 2013 |
Event | 42nd International Congress and Exposition on Noise Control Engineering - Innsbruck, Austria Duration: 15 Sept 2013 → 18 Sept 2013 |
Conference
Conference | 42nd International Congress and Exposition on Noise Control Engineering |
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Country/Territory | Austria |
City | Innsbruck |
Period | 15/09/2013 → 18/09/2013 |
Keywords
- Free field
- Microphone Calibration
- Ultrasound