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Comparison of Anemometric Probe and Tetrahedral Microphones for Sound Intensity Measurements

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The measurement of sound intensity requires the acquisition of sound pressure and acoustic velocity in a coincident position. Various transducer topologies can be used to measure the acoustic velocity directly or indirectly. In this paper, three transducers are compared: a pressure-velocity anemometric probe and two tetrahedral B-Format microphones from different manufacturers. The comparison has been carried out in different acoustic fields, ranging from anechoic to diffuse, reverberant field conditions. The analysis and comparison is based on intensimetric quantities such as the radiation index and the sound intensity vector. Strengths and limitations of the various approaches are reported, to suggest the preferred applications for each transducer.

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