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THE ACOUSTICS LABORATORY

Room G115 – Department of Physics, Ferrara University

The Lab has been conceived to work mainly with p-v sound intensity probes both in intensimetric and hyper-intensimetric configuration for measuring the concatenated pressure-velocity response of any acoustic system. Typical 1-D reference field setups allow the monitoring and control of sound energetic indicators with different boundary conditions.

Room G115: overview of the laboratory and of the 4-m acoustic wave guide MicroFlown USP intensity probe inside the wave guide

Axial probe MicroFlown PU Match coupled Detail of MicroFlown velocity sensor

for hyper-intensimetric measurement

CALIBRATION ENVIRONMENT

The calibration environment consists in an 84 m long, 2 cm wide aluminium tube, coupled at one end with a dual cone loudspeaker. A modified tenor trombone bell, used as an impedance adaptor, grants an optimal excitation of the air column. The tube works as a one-dimensional progressive plane wave guide up to about 10 kHz, when transversal modes start to be excited due to the geometry of the tube. The environment, where the wave guide is built in, is a 100 m underground corridor, part of the LARIX laboratory of the Department of Physics, which provides a good homogeneity of medium thermodynamic characteristics, such as air temperature and humidity. The acoustic source allows a good sound radiation into the wave guide in the whole frequency range from 20 Hz to 10 kHz: the full bandwidth calibration of any p-v probe can be thus executed with a single measuring session.