Referenced measurements of diffuser reflections using an acoustic goniometer

Abstract

This research embarks on high resolution measurements for diffuser reflection coefficients in room acoustic and noise control applications. This work implements the practical goniometer measurements with a 16-channel microphone carriage. With the diffuser surrounded by the acoustical goniometer, scattered reflections are captured at varying angles through correlation measuring technique emitted from a speaker. A windowing method is employed to separate incident and reflected components. The impulse responses facilitate measurement of scattered reflectance at 144 angles, offering higher angular resolution. This work focuses on reference measurement in order to achieve scattered reflectance with desired accuracy. By adopting the goniometer-based approach, architectural acousticians can obtain a higher level of detailed acoustic analysis on diffusing devices, addressing a critical gap in current measurement practices pertaining to scattered reflectance, specifically for oblique incidences. This paper discusses measurement results on refined references and demonstrates high resolution measurement practice.