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|Type:||Artigo de evento|
|Title:||Using Particle Velocity Sensors In Impedance Tube Measurements|
Dos Santos J.M.C.
Bordignon Jr. D.
De Franca Arruda J.R.
|Abstract:||Particle velocity sensors have been developed some years ago, but have not been fully exploited yet. A signal that is proportional to the particle velocity can be very useful in many applications. Current particle velocity sensors have a sensitivity that is highly dependent on frequency and are limited in frequency range. Thus, calibration is more elaborate, and must be integrated into the acoustical measurement procedure. An example is the impedance tube, where there are advantages in using a velocity sensor combined with a microphone (P-U technique). In this paper, the calibration procedures for the P-U and U-U techniques are explained in detail and the expressions for computing the absorption coefficient with the impedance tube using both techniques are reviewed. Both a single particle velocity sensor and a combined pressure/velocity sensor are used in the experiments. Experimental issues such as measurement noise, dynamic range, frequency range, and signal processing are discussed.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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