Methods of imaging, focusing and conditioning neutrons
US6765197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2001 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Sep 27, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21K2201/068
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A compound refractive lens for neutrons is provided having a plurality of individual unit Fresnel lenses comprising a total of N in number. The unit lenses are aligned substantially along an axis, the i-th lens having a displacement ti orthogonal to the axis, with the axis located such that Each of the unit lenses comprises a lens material having a refractive index decrement &dgr;<1 at a wavelength &lgr;<200 Angstroms. In a preferred mode, the lens above is configured such that the displacements ti are distributed and have a standard deviation &sgr;t of the displacements ti about the axis, and wherein each of the unit lens has a smallest Fresnel zone width of sn−sn−1, where sn and sn−1 are the zone radii of the n and n−1 zones and the standard deviation is &sgr;t≦[sn−sn−1]/4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.