角膜地形图和波前像差测量中同心环的同步相位解调
Synchronous phase-demodulation of concentric-rings Placido mires in corneal topography and wavefront aberrometry (theoretical considerations)
摘要：
本文提出一种数字干涉法解调普拉西多条纹图。该方法使用计算机存储的圆锥波前作为参考载波。尽管如此，Placido mires广泛用于角膜地形图仪。然而，这不是一篇关于角膜地形图和/或其临床应用的论文。本文着重于理论方面的相位解调普拉西多沼泽使用同步干涉技术。普拉西多图案也可以应用于使用具有周期性环形孔径的普拉西多-哈特曼不透明板来测试光学波前。该测试对测量波前的径向斜率敏感。另一波前测试方法可以使用具有环形小透镜的周期性阵列的Placido-Hartmann-Shack屏幕。该周期性屏幕对小透镜的焦平面处的波前的径向斜率敏感。简而言之，本文首次应用数字干涉方法来解调圆锥载波普拉西多图像。（专利申请在USPTO）。
英文摘要：
This paper presents a digital interferometric method to demodulate Placido fringe patterns. This method uses a computer-stored conic-wavefront as reference carrier. Even though, Placido mires are widely used in corneal topographers. This is not however a paper on corneal topography and/or its clinical use. This paper focuses on the theoretical aspects to phase-demodulate Placido mires using synchronous interferometric techniques. Placido patterns may also be applied to test optical wavefronts using a Placido-Hartmann opaque plate with periodic annular apertures. This test is sensitive to the radial slope of the measuring wavefront. Another wavefront testing approach may use a Placido-Hartmann-Shack screen with a periodic array of toroidal lenslets. This periodic screen is sensitive to the wavefront's radial-slope at the focal plane of the lenslets. In brief, digital interferometric methods are herein applied for the first time to demodulate conic-carrier Placido images. (Patent pending at the USPTO).
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