无规入射散射系数测量的研究

Study on the measurements of Random-incidence Scattering Coefficient

无规入射散射系数是在扩散声场中界面散射声能与总反射声能之间的比值,它是采用计算机模拟来对室内声场进行预测的重要参量。国际标准化组织(ISO)即将公布其对无规入射散射系数的定义及其在混响场中的测量方法。关于这一方法的有效实施以及准确地获得实验数据,显得尤为重要。根据测量的基本原理建立了完整的无规入射散射系数测量系统,并给出典型散射试件的测量结果,分析了测量中的一些技术问题。

Random-incidence scattering coefficient is the ratio of the scattered acoustics energy to the total reflected energy from a surface in a diffuse sound field. It is an important parameter in the prediction of sound field by computer simulation. ISO is to publish its standard on the definition of random-incidence scattering coefficient and measurement method in a reverberation room. It is very important to effectively implement the method and to exactly acquire the data in the experiment. In this paper, a measurement system for random-incidence scattering coefficient is established. Based on the measurement results of a typical scattering sample, the technical problems in the measurement are analyzed.