Patent ID: 8004687
Filing Date: 2011-08-23
Classification: G01B

Abstract:
1. An interferometric system, comprising: a reference object; a test object; at least a first and a second mutually orthogonally polarized beam of light, the first beam interacting with a series of optical components including a reference object and a test object along a first path and the second beam interacting with the series of optical components along a second path wherein the first path-is spatially displaced from the second path at each component of the series of optical components, wherein the reference object has a surface curvature that focuses the first and the second beams back along a same path travelled by the beams entering the test object; a simultaneous phase shifting module that receives at least a portion of the first and second beams after the first and second beams have interacted with said reference object and said test object; and at least two phase-shifted interferograms generated substantially simultaneously from the portion of the first and second beams received at the simultaneous phase shifting module.