Spatial-heterodyne interferometry for transmission (SHIFT) measurements
US7119905B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 2003 |
| Grant date | Oct 10, 2006 |
| Priority date | — |
| Expiry date | May 14, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2210/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Systems and methods are described for spatial-heterodyne interferometry for transmission (SHIFT) measurements. A method includes digitally recording a spatially-heterodyned hologram including spatial heterodyne fringes for Fourier analysis using a reference beam, and an object beam that is transmitted through an object that is at least partially translucent; Fourier analyzing the digitally recorded spatially-heterodyned hologram, by shifting an original origin of the digitally recorded spatially-heterodyned hologram to sit on top of a spatial-heterodyne carrier frequency defined by an angle between the reference beam and the object beam, to define an analyzed image; digitally filtering the analyzed image to cut off signals around the original origin to define a result; and performing an inverse Fourier transform on the result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.