Imaging apparatus and imaging method
US8559594B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2011 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Apr 26, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/401
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An imaging apparatus analyzes a periodic pattern of a Moiré due to Talbot interference by the Fourier transform method and forms an image. The imaging apparatus includes a first grating having a structure that transmits light beams from a beam source to refract or diffract the light beams and forms a self image based on a first periodic pattern by the Talbot interference at a predetermined position; a second grating that absorbs part of the first periodic pattern and causes a Moiré to be generated based on a second periodic pattern when the second grating is arranged at a position at which the self image is formed. All cross sections of the Moiré with axes in differential directions of a wavefront for the analysis by the Fourier transform method have a two-dimensional periodic structure in which periods of patterns in the second periodic pattern are the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.