COMMENT MESURER L'INTENSITÉ ACOUSTIQUE CORRECTEMENT ?

Abstract
Acoustic intensity is a physical term well known and now frequently used by research labs and manufacters to qualify sound sources by measuring their sound power and locating their radiating areas. Acoustic intensity is currently measured with a 2 microphones- probe (P-P probe). The calibration of the measuring system has to be done for reliability of measurements. The New IEC standard 1043 defines required technical specifications of the intensity measuring system mainly composed by a probe and a frequency analyser. Particularly, pressure - residual intensity index represents the quality of the system. Brüel & Kjaer has recently released a calibration system allowing complete calibration of the measuring system. Residual intensity may be used for the final calculation of acoustic intensity but many cares has to be taken. A more reliable and simple way is to measure acoustic intensity directly with phase matched channels.