用超声研究菲涅耳区的Cornu螺旋：相位研究
Cornu's spiral in the Fresnel regime studied using ultrasound: A phase study
摘要：
测量衍射超声波相位和振幅的一种简单实验技术[A. Hitachi和M.高田市78，678（2010）]已经应用于衍射具有直边的物体，作为Cornu螺旋的演示。巴比涅的原则进行了研究，观察超声场背后的狭缝和互补条障碍，并直接验证了比较矢量（相量）在复平面。在直屏的几何阴影中观察到的衍射波的相位具有起源于直屏边缘的柱面波的形式，作为Young提出的边界衍射波。此外，如惠更斯-菲涅耳衍射理论所预测的，已经观察到入射波在穿过狭缝中心线（对称平面）的波之后具有π/4的相位延迟。
英文摘要：
A simple experimental technique for measuring the phase and amplitude of diffracting ultrasound wave [A. Hitachi and M. Takata, Am. J. Phys. 78, 678 (2010)] has been applied to diffracting objects with straight edges as a demonstration of the Cornu spiral. Babinet's principle is studied observing the ultrasound field behind a slit and a complementary strip obstacle and is verified directly by comparing vectors (phasors) in the complex plane. The phase of the diffracted wave observed in the geometrical shadow of the straight screen has the form of a cylindrical wave originating at the edge of the straight screen as the boundary diffraction wave proposed by Young. In addition, the incident wave has a phase delay of pi/4 behind the wave passing through on the center line of the slit, the plane of symmetry, has been observed as predicted by Huygens-Fresnel diffraction theory.
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