ABSTRACT
While surface scattering elements have been used accidentally or by design in rooms for centuries, it is only in recent decades that a concerted effort has been made to develop methods for measuring and characterizing the scattering from these surfaces.1 Without measurements of surface reflections, it is impossible to confidently design and apply diffusers. Consequently, this chapter starts by describing methods for measuring the scattering produced by a surface. This mainly concentrates on measurements in terms of polar responses, as this is the primary way that surface reflection has been measured for diffuser design and evaluation.
