Quantitative Measurement of Airborne Ultrasound Utilizing Light Refractive Tomography

Konferenz: Sensoren und Messsysteme 2014 - Beiträge der 17. ITG/GMA-Fachtagung
03.06.2014 - 04.06.2014 in Nürnberg, Deutschland

Tagungsband: Sensoren und Messsysteme 2014

Seiten: 5Sprache: EnglischTyp: PDF

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Rupitsch, Stefan J.; Chen, Lizhuo; Winter, Philipp; Lerch, Reinhard (Chair of Sensor Technology, Friedrich-Alexander-University Erlangen-Nuernberg, Erlangen, Germany)

In this contribution, we utilize light refractive tomography (LRT) to quantify the sound field of an airborne ultrasound transducer operating at 40 kHz. The most important component of the experimental setup is a laser Doppler vibrometer (LDV). By using tomographic reconstruction, LRT provides both, spatially and temporal resolved data for acoustic pressure in optically transparent media. Since LRT is an optical method, it is non-invasive and does not affect the resulting pressure field. Comparisons of LRT and conventional microphone measurements reveal that the maximum deviation for the investigated airborne transducer is in the range of 10%.