Patent US4649557A successfully refreshed from Google Patents.
US4649557A
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X-ray analysis apparatus including a monochromator crystal having crystal lattice surfaces
Assignee: US Philips Corp
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Filing: 1984-06-22
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Granted: 1987-03-10
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Expires: 2004-06-22
Abstract
Abstract A monochromator in an X-ray analysis apparatus involves a crystal having spherically curved crystal lattice surfaces with the boundary surface of the crystal having a radius of curvature R in a first principal direction and a radius of curvature 2R in a second principal direction. The second principal direction is transverse with respect to the first principal direction. A high radiation efficiency is obtained by constructing an entrance slit and an exit slit for X-rays to conform to curved circles of latitude on a Rowland sphere applicable to the monochromator crystal.
Inventors
- 👤 Jan Hornstra
- 👤 Mathias P. A. Viegers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:39
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/20; G01N23/207; G01N23/2076; G01N23/22; G01N23/223
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
58 words
An X-ray analysis apparatus comprising an X-ray source, a doubly curved monochromator crystal having doubly curved crystal lattice surfaces, said monochromator crystal exhibiting mutually and significantly different amounts of surface curvature in different principal directions, and x-ray detector means for detecting X-rays from said monochromator crystal, wherein said first principal direction is transverse to said second principal direction.
Claim 2
Dependent Claim
58 words
An X-ray analysis apparatus comprising an X-ray source, a doubly curved monochromator crystal having doubly curved crystal lattice surfaces, said monochromator crystal exhibiting mutually and significantly different amounts of surface curvature in different principal directions, and x-ray detector means for detecting X-rays from said monochromator crystal, wherein said first principal direction is transverse to said second principal direction.
Claim 3
Dependent Claim
91 words
An X-ray analysis apparatus comprising an X-ray source, a doubly curved monochromator crystal having doubly curved crystal lattice surfaces, said monochromator crystal exhibiting mutually and significantly different amounts of surface curvature in different principal directions, and x-ray detector means for detecting X-rays from said monochromator crystal, wherein said monochromator crystal is mounted at a Rowland sphere having a radius R, and wherein said monochromator crystal is curved in a first principal direction with said radius R and said monochromator crystal is curved in a second principal direction with a radius 2R.
Claim 4
Dependent Claim
91 words
An X-ray analysis apparatus comprising an X-ray source, a doubly curved monochromator crystal having doubly curved crystal lattice surfaces, said monochromator crystal exhibiting mutually and significantly different amounts of surface curvature in different principal directions, and x-ray detector means for detecting X-rays from said monochromator crystal, wherein said monochromator crystal is mounted at a Rowland sphere having a radius R, and wherein said monochromator crystal is curved in a first principal direction with said radius R and said monochromator crystal is curved in a second principal direction with a radius 2R.
Claim 5
Dependent Claim
20 words
An X-ray analysis apparatus according to claim 2, wherein said first principal direction is transverse to said second principal direction.
Claim 6
Dependent Claim
20 words
An X-ray analysis apparatus according to claim 1 or 2, wherein said doubly curved crystal lattice surfaces are spherically curved.
Claim 7
Dependent Claim
41 words
An X-ray analysis apparatus according to claim 4, wherein an entrance slit for passing X-rays from said X-ray source and an exit slit for passing said X-rays from said monochromator crystal to said detector means are provided on said Rowland sphere.
Claim 8
Dependent Claim
53 words
An X-ray analysis apparatus according to claim 5, wherein said entrance slit and said exit slit are both curved to coincide with a circle of latitude on said Rowland sphere relative to monochromator crystal, said circle of latitude defining a plane perpendicular to a perpendicular to a central point of said monochromator crystal.
Claim 9
Dependent Claim
62 words
An X-ray analysis apparatus according to claim 5, wherein incident and reflected X-rays on said monochromator crystal are inclined at an angle θ with respect to said spherically curved crystal lattice surfaces, and wherein said entrance slit and said exit slit are situated at a height along a perpendicular to a central point of said monochromator crystal where h=2R sin 2 θ.
Claim 10
Dependent Claim
30 words
An X-ray analysis apparatus according to claim 5, wherein said entrance slit and said exit slit both have lengths at least substantially equal to a diameter of said monochromator crystal.
Claim 11
Dependent Claim
40 words
An X-ray analysis apparatus according to claim 4, wherein said X-ray source provides an adapted, curved, linear focus to serve as an entrance slit, and wherein said detector means has an entrance surface being an adapted, curved, active exit slit.
Claim 12
Dependent Claim
62 words
A monochromator crystal for an X-ray analysis apparatus comprising a doubly curved crystal having doubly curved crystal lattice surfaces, and said crystal exhibiting mutually and significantly different amounts of surface curvature in different directions, wherein said crystal is curved in a first principal direction with a radius R and said crystal is curved in a second principal direction with a radius 2R.
Claim 13
Dependent Claim
62 words
A monochromator crystal for an X-ray analysis apparatus comprising a doubly curved crystal having doubly curved crystal lattice surfaces, and said crystal exhibiting mutually and significantly different amounts of surface curvature in different directions, wherein said crystal is curved in a first principal direction with a radius R and said crystal is curved in a second principal direction with a radius 2R.
Claim 14
Dependent Claim
19 words
A monochromator crystal according to claim 10, wherein said first principal direction is transverse to said second principal direction.
Claim 15
Dependent Claim
52 words
A monochromator crystal for an X-ray analysis apparatus comprising a doubly curved crystal having doubly curved crystal lattice surfaces, and said crystal exhibiting mutually and significantly different amounts of surface curvature in different directions, wherein said crystal is curved in a toroidal shape having principal radii of curvature of R and 2R.
Claim 16
Dependent Claim
52 words
A monochromator crystal for an X-ray analysis apparatus comprising a doubly curved crystal having doubly curved crystal lattice surfaces, and said crystal exhibiting mutually and significantly different amounts of surface curvature in different directions, wherein said crystal is curved in a toroidal shape having principal radii of curvature of R and 2R.
Claim 17
Dependent Claim
21 words
A monochromator crystal according to claim 10 or 12, wherein said crystal is one of silicon, germanium, pentaerythritol, and thallium hydrophtalate.
Claim 18
Independent Claim
80 words
A method of manufacturing a monochromator crystal having mutually and significantly different amounts of surface curvature in different principal directions comprising the steps of providing a cylindrical plate of material which exhibits X-ray diffraction, arranging said plate in a forming jig, said forming jig having a toroidal forming surface with principal radii of curvature of R and 2R, and deforming said plate in said forming jig to provide said principal radii of curvature R and 2R on the deformed plate.
Claim 19
Independent Claim
80 words
A method of manufacturing a monochromator crystal having mutually and significantly different amounts of surface curvature in different principal directions comprising the steps of providing a cylindrical plate of material which exhibits X-ray diffraction, arranging said plate in a forming jig, said forming jig having a toroidal forming surface with principal radii of curvature of R and 2R, and deforming said plate in said forming jig to provide said principal radii of curvature R and 2R on the deformed plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |