公开(公告)号：US07369248B2

公开(公告)日：2008-05-06

申请号：US10530916

申请日：2003-10-08

Applicant: Lun Kai Cheng

Inventor： Lun Kai Cheng

IPC: G01B9/02

CPC classification number: G01B9/02083 ,  G01B9/02067 ,  G01B2290/45 ,  G02B6/2821 ,  G02B2006/2865

Abstract: In measuring an optical path length difference, light from a light source is guided through a first and a second path. A three-way coupler combines light from the first and the second path in at least three combination, with at least three mutually different added relative phase displacements. A detector measures interference intensities of the at least three combinations. From the intensities, a calculation unit determines a phase difference between the light from the first and second path while eliminating an effect of a contrast between the light from the first and second path.

Abstract translation: 在测量光程长度差时，来自光源的光被引导穿过第一和第二路径。 三通耦合器将来自第一和第二路径的光组合在至少三个组合中，具有至少三个相互不同的相加相位位移。 检测器测量至少三种组合的干扰强度。 根据强度，计算单元确定来自第一和第二路径的光之间的相位差，同时消除来自第一和第二路径的光之间的对比度的影响。