Apparatus for Measuring Acoustic Absorption In-Situ

摘要

A phased microphone imaging array and repeatable sound source are used in concert to determine absorption and reflection coefficients of materials and spaces across a continuous frequency domain. Coefficients can be determined at normal and oblique incidences to the surface using beamforming software. The invention can be used in-situ without needing to alter the environment in which it is testing. Accurate results can be obtained at any distance from the array and sound source to the testing surface with relatively little material.

主权项

1. A method for measuring absorption and reflection coefficients of materials or spaces comprising of a repeatable sound source, a phased microphone imaging array, and beamforming techniques to generate sound power incident and reflected. Sound from the source reflects from a test surface and is recorded by the phased array which utilizes beamforming software to calculate sound power yielding the acoustical coefficients.