Development of a polar intensity measurement technique and potential uses

Abstract

A robotic apparatus was designed and developed to take rapidly polar sound intensity measurements. This technique has a double dimension: it entails the expression of the relationship between the polar information and the standard acoustical parameters, and secondly, the robotic handling of the sound intensity probe with its two coupled microphones. The robot can be interfaced, through a PS/2 computer, to the Bruel & Kjaer dual channel third octave real time analyser 2133 or to the 2032 double FFT analyser. The robot can use an orthogonal routine, allowing a fast reading of the three vectorial components in a stationary acoustical mode, and it can be programmed to search automatically the maximum intensity level for the determination of the flux line or, in near field, with the aim of reactive intensity. Potential utilization of this technique was developed for complex industrial acoustical fields or for architectural acoustics