【摘要】 本文从波动理论出发，应用惠更斯一菲涅耳原理于声透镜声场描述，把透镜当成一种位相调制器，首次把光学中处理透镜位相调制因子概念引入声透镜声场计算中，作为声透镜对入射波前位相调制的量度，根据瑞利－索末菲衍射理论，导出了薄声透镜声场的积分表达式，并在近轴条件下，采用比非涅耳近似更高阶的近似方法，得到了适用于计算较大孔径薄声透镜声场分布的瑞利一索末菲衍射公式，为这类声透镜的声场分析提供了理论基础。更多还原

【Abstract】 In this p aper, by appling Huygens-Fresnel principle to aeonstic fields of the lens and taking lens as a phase modulator, the integral expression of acoustic field of lens is derived by means of RayleighSommerfeld Diffraction theory, Further, under near-axis, by using higher-grade approximate method than that of Fresnel, a simplified Reyleigh-Sommerfeld Diffraction Formula, which is applicable to acoustic fields formed by the thin acoustic lens with larger aperture, is obtained.更多还原