Utilization of acoustical camera for objectification and evaluation od industrial noise

Abstract

The „acoustic camera“ is a measurement tool which joined the field of acoustics a few years ago. This technology analyses the actual sound scene, which consists of a superposition of different sound sources, into a visual sound map. The basic principle relies on accurate calculation of the specific runtime delays of acoustic sound emissions radiating from several sources to the individual microphones of an array. An acoustic map of the local sound pressure distribution at a given distance will be calculated using the acoustic data of all simultaneously recorded microphone channels. The sound pressure level is displayed by color coding, similar to popular thermal imaging. Automatic overlay of optical image and acoustic map gives rapid answers about locations of dominating sound sources.