一种任意入射角反射系数反演技术

A technique of reconstructing reflection coefficients at arbitrary angles of incidence

利用声场空间变换技术反演声学材料或声反射面在任意入射角时的反射系数，需要测量靠近反射面上方两平行面上复声压。本文提出利用声强与声压幅值测量来获取复声压的相位，进而实现反射系数反演。研究表明用点声源时因有限测量尺寸而产生的误差大小可以通过采用偶极子源来减小。数值模拟结果与误差分析结果均表明了这种反演任意入射角反射系数技术的有效性。

The complex pressure on two parallel planes lying close to the surface of a test material or the reflection surface should be measured, in order to reconstruct the reflection coefficients at arbitrary angles of incidence by means of the spatial Transformation of Sound Fields technique. This paper proposes that the complex pressure phase is obtained by measuring of the sound intensity and the pressure magnitude,to realize furthermore the reconstructing of reflection coefficieDts. Investigation has been made into the error due to the finite size of the measurement area to show that the magnitude of the error can be reduced by using a dipole source instead of a monopole source. These results of numerical simulations and the error analysis have proved the feasibility of the above-mentioned technique.