Automatized system for 3D sound intensity field measurement

Abstract

In the paper a portable automatized system for measurements of vectorial effects in a sound intensity field is presented. The system enables the realization of the point-by-point measurements of the sound intensity field and consists of 3 main blocks realised in LabVIEW environment: positioning system control, multichannel data acquisition and signal processing. This hardware-software solution allows the determination of the spatial vector distribution of sound intensity. To estimate sound intensity vector at each measurement point in space, sound pressure scalar and three component (x, y, z) of sound particle velocity (3D) vector must be measured. It is done using the condenser microphone coupled with 3D Microflown hot wire anemometry USP type sensor. The system controls positioning of the measuring probe in sequential points, acquires 4 data channels (pressure and 3 velocity components) and processes the data to obtain the sound intensity values in each measuring points. All the computation needed is done in real-time.