US4562585A
Expired / Lapsed
US
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Sequential x-ray crystal spectrometer
Assignee: Siemens AG
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Filing: 1985-04-22
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Granted: 1985-12-31
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Expires: 2005-04-22
Abstract
Abstract A sequential x-ray spectrometer has a curved analyzer crystal and a position-sensitive detector. In order to obtain a high quantum yield or efficiency, an extensive suppression of scattered background radiation, and an increase of the measuring speed, the position-sensitive detector is arranged in a mobile fashion.
Inventors
- 👤 Herbert Gobel
- 👤 Rupert Kopl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:07
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/20; G01N23/207; G01N23/2076; G01N23/22; G01N23/223
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
169 words
A sequential x-ray spectrometer for analyzing x-ray radiation from a sample, comprising: a curved analyzer crystal; position-sensitive detector means for measuring x-ray radiation intensity from the sample via the analyzer crystal; means for displacing the position sensitive detector means during analysis; means for rotating the analyzer crystal so as to scan a surface of the sample; means for rotating the position sensitive detector means during analysis; said curved analyzer crystal being a focusing crystal for focusing the radiation on the detector means; said displacing means displacing the detector means so that a given point of the detector means remains on a focusing circle where the x-ray radiation is focused by the focusing crystal; and the detector means rotating means rotating the detector means through an angle which is twice as large as an angle through which the analyzer crystal is rotated by its rotating means such that during simultaneous displacement of the detector means on the focusing circle, the given point of the detector means remains at the focus.
Claim 2
Dependent Claim
169 words
A sequential x-ray spectrometer for analyzing x-ray radiation from a sample, comprising: a curved analyzer crystal; position-sensitive detector means for measuring x-ray radiation intensity from the sample via the analyzer crystal; means for displacing the position sensitive detector means during analysis; means for rotating the analyzer crystal so as to scan a surface of the sample; means for rotating the position sensitive detector means during analysis; said curved analyzer crystal being a focusing crystal for focusing the radiation on the detector means; said displacing means displacing the detector means so that a given point of the detector means remains on a focusing circle where the x-ray radiation is focused by the focusing crystal; and the detector means rotating means rotating the detector means through an angle which is twice as large as an angle through which the analyzer crystal is rotated by its rotating means such that during simultaneous displacement of the detector means on the focusing circle, the given point of the detector means remains at the focus.
Claim 3
Dependent Claim
14 words
A sequential x-ray spectrometer according to claim 1 wherein the analyzer crystal is rotatable.
Claim 4
Dependent Claim
20 words
A sequential x-ray spectrometer according to claim 1 wherein the position-sensitive detector means is a position-sensitive proportional counter tube (PSPC).
Claim 5
Dependent Claim
24 words
A sequential x-ray spectrometer according to claim 3 wherein means are provided for moving the position-sensitive proportional counter tube (PSPC) in an uninterrupted motion.
Claim 6
Dependent Claim
31 words
A sequential x-ray spectrometer according to claim 1 wherein means are provided for limiting the detected radiation beam to substantially direct rays passing to the detector means from the analyzer crystal.
Claim 7
Dependent Claim
29 words
A sequential x-ray spectrometer according to claim 1 wherein movement of the triple knife edge diaphragm is coupled to movements of the analyzer crystal and of the detector means.
Claim 8
Dependent Claim
33 words
A sequential x-ray spectrometer according to claim 5 wherein a variable exit diaphragm means is positioned adjacent the detector means for changing a coverable angular range of incident radiation on the detector means.
Claim 9
Dependent Claim
22 words
A sequential x-ray spectrometer according to claim 5 wherein a Soller collimator is provided between an exit diaphragm and the detector means.
Claim 10
Dependent Claim
68 words
A sequential x-ray spectrometer according to claim 5 wherein a triple-knife edge diaphragm means is positioned adjacent the analyzer crystal and which moves such that the analyzer crystal is optimally illuminated in every position, said diaphragm means providing that only such radiation directly proceeding from the analyzer crystal to the detector means reaches the detector means in every position of the analyzer crystal and of the detector means.
Claim 11
Dependent Claim
70 words
A sequential x-ray spectrometer according to claim 1 wherein means are provided for counting x-rays of equal wavelength into equal channels of an electronic analysis means of the spectrometer such that a channel address for a given diffraction angle of an x-ray quantum results through addition of the addresses for an angular position of the position-sensitive detector means and for incidence location of the x-ray quantum in the detector means.
Claim 12
Dependent Claim
25 words
A sequential x-ray spectrometer according to claim 10 wherein means are provided for linearly digitizing and in the same scale the addresses to be added.
Claim 13
Dependent Claim
40 words
A sequential x-ray spectrometer according to claim 8 wherein means are provided for connecting an angular scale for the incidence location in the detector means in correspondence with the distance of the analyzer crystal detector means from the detector means.
Claim 14
Dependent Claim
18 words
A sequential x-ray spectrometer according to claim 1 wherein the means for moving includes a linear guidance means.
Claim 15
Dependent Claim
17 words
A sequential x-ray spectrometer according to claim 13 wherein at least one stepping motor drive is provided.
Claim 16
Dependent Claim
19 words
A sequential x-ray spectrometer according to claim 14 wherein an electronic coupling of two stepping motor drives is provided.
Claim 17
Dependent Claim
18 words
A sequential x-ray spectrometer according to claim 14 wherein a mechanical coupling of two rotational movements is provided.
Claim 18
Dependent Claim
142 words
A sequential x-ray spectrometer for analyzing x-ray radiation from a sample, comprising: a curved analyzer crystal which comprises a focusing crystal; means for pivoting the analyzer crystal about an axis thereof during analysis so as to scan a surface of the sample; position-sensitive detector means for measuring x-ray radiation intensity from the analyzer crystal; means for displacing the position-sensitive detector means during analysis; means for rotating the detector means; and said pivoting means, rotating means, and displacing means being coordinated such that an angular rotation of the detector means is twice as large as a pivoting angle of the analyzing crystal and wherein the detector means is simultaneously displaced on a focusing circle of the spectrometer so that a center of the detector means remains in focus and such that the detector means faces the incoming x-ray radiation from the analyzer crystal.
Claim 19
Dependent Claim
142 words
A sequential x-ray spectrometer for analyzing x-ray radiation from a sample, comprising: a curved analyzer crystal which comprises a focusing crystal; means for pivoting the analyzer crystal about an axis thereof during analysis so as to scan a surface of the sample; position-sensitive detector means for measuring x-ray radiation intensity from the analyzer crystal; means for displacing the position-sensitive detector means during analysis; means for rotating the detector means; and said pivoting means, rotating means, and displacing means being coordinated such that an angular rotation of the detector means is twice as large as a pivoting angle of the analyzing crystal and wherein the detector means is simultaneously displaced on a focusing circle of the spectrometer so that a center of the detector means remains in focus and such that the detector means faces the incoming x-ray radiation from the analyzer crystal.
Claim 20
Dependent Claim
28 words
A spectrometer according to claim 17 wherein the position-sensitive detector means is rotated and displaced in order to coordinate its movement with the rotation of the analyzer crystal.
Claim 21
Dependent Claim
25 words
A spectrometer according to claim 17 wherein the detector means is aligned perpendicularly relative to incoming x-ray radiation from a center of the analyzer crystal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |