US3628040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-dispersion, high-resolution x-ray spectrometer having means for detecting a two-dimensional spectral pattern
Assignee: Massachusetts Institute of Technology
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Filing: 1969-05-19
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Granted: 1971-12-14
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Expires: 1989-05-19
Abstract
Abstract Apparatus is disclosed for providing a two-dimensional spectral pattern of X-ray radiation. The radiation, which may be provided by a wide angle point source in the apparatus or may come from a cosmic X-ray source, is directed upon a bent crystal to provide spectral dispersion and focusing The rays reflected from the crystal are then detected, as upon a film or the like, at an area positioned away from the focal region of the crystal to produce the two-dimensional pattern. In one embodiment of the apparatus provision is made to feed information from the detector to a computer to yield simultaneous analysis of the radiation both as to the frequencies present therein and the intensity of each.
Inventors
- 👤 Herbert W Schnopper
- 👤 Kenneth Kalata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:28
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/36
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
64 words
An X-ray spectrometer for displaying discrete spectral features, that comprises, a point source of X-rays that illuminates a large solid angle, a curved crystal positioned to receive the X-rays from said point source and adapted to reflect and focus the same, and two-dimensional detector means positioned away from the focal region of the crystal to receive the X-rays as a two-dimensional spectrally dispersed pattern.
Claim 2
Dependent Claim
64 words
An X-ray spectrometer for displaying discrete spectral features, that comprises, a point source of X-rays that illuminates a large solid angle, a curved crystal positioned to receive the X-rays from said point source and adapted to reflect and focus the same, and two-dimensional detector means positioned away from the focal region of the crystal to receive the X-rays as a two-dimensional spectrally dispersed pattern.
Claim 3
Dependent Claim
30 words
Apparatus as claimed in claim 1 in which the detector is a film oriented substantially orthogonal to the direction of propagation of the X-rays to receive and record the same.
Claim 4
Dependent Claim
30 words
Apparatus as claimed in claim 1 in which an X-ray detector is placed behind a small aperture and in which means is provided to raster scan across the two-dimensional pattern.
Claim 5
Dependent Claim
18 words
Apparatus as claimed in claim 1 in which the point source of X-rays has a large cone angle.
Claim 6
Dependent Claim
32 words
Apparatus as claimed in claim 4 in which the detector comprises a multichannel detector array the detecting surface of which is disposed substantially orthogonal to the direction of propagation of the X-rays.
Claim 7
Dependent Claim
37 words
Apparatus as claimed in claim 5 in which the multichannel detector array comprises a plurality of multichannel multiplier imaging tubes the axes of which are oriented substantially parallel to the direction of propagation of the reflected X-rays.
Claim 8
Dependent Claim
47 words
Apparatus as claimed in claim 6 including multichannel storage means to receive signals from the tubes of the array individually and to record the intensity of the X-ray radiation received by each of the tubes, the signals from the tubes being accumulated by said multichannel storage means.
Claim 9
Dependent Claim
22 words
Apparatus as claimed in claim 7 and including permanent storage means to receive and store an output from the multichannel storage means.
Claim 10
Dependent Claim
21 words
Apparatus as claimed in claim 8 and including a computer to receive and analyze the information accumulated in the storage means.
Claim 11
Dependent Claim
102 words
Apparatus as claimed in claim 1 in which the detector comprises a multichannel detector array and in which the output of the detector array is fed to a computer programmed to analyze the radiation in terms of wavelengths on the basis of the following relationships: n lambda 2d sin ( theta B+ Delta ) where d is the crystal-lattice spacing, theta B is the central Bragg angle, and Delta is given by Delta about Alpha 2/2 cot theta B- phi 2/2 tan theta B for a cylindrically bent crystal, and Delta about Alpha 2/2 cot theta B for a spherically bent crystal.
Claim 12
Dependent Claim
25 words
Apparatus as claimed in claim 1 in which the crystal is a substantially large crystal at least about 1 to 3 inches in cross dimensions.
Claim 13
Independent Claim
53 words
A method of displaying discrete spectral features of X-ray radiation, that comprises, directing the radiation from a large cone angle point source upon a curved crystal adapted to reflect and focus the radiation, and detecting the radiation at an area positioned away from the focal region thereof as a widely dispersed two-dimensional pattern.
Claim 14
Independent Claim
53 words
A method of displaying discrete spectral features of X-ray radiation, that comprises, directing the radiation from a large cone angle point source upon a curved crystal adapted to reflect and focus the radiation, and detecting the radiation at an area positioned away from the focal region thereof as a widely dispersed two-dimensional pattern.
Claim 15
Dependent Claim
104 words
An X-ray spectrometer for displaying discrete spectral features of radiation from a point X-ray source which illuminates a large solid angle, that comprises, a fairly large cylindrically bent or spherically bent crystal, at least about 1 to 3 inches in cross dimensions, adapted to reflect and focus the spectral band of rays from said source at the crystal focal region, and two-dimensional detector means positioned away from the focal region of the crystal and having a detector oriented to receive the spectral band of X-rays and to display the X-rays as a two-dimensional spectrally dispersed pattern from which a high-resolution spectrum can be obtained.
Claim 16
Dependent Claim
104 words
An X-ray spectrometer for displaying discrete spectral features of radiation from a point X-ray source which illuminates a large solid angle, that comprises, a fairly large cylindrically bent or spherically bent crystal, at least about 1 to 3 inches in cross dimensions, adapted to reflect and focus the spectral band of rays from said source at the crystal focal region, and two-dimensional detector means positioned away from the focal region of the crystal and having a detector oriented to receive the spectral band of X-rays and to display the X-rays as a two-dimensional spectrally dispersed pattern from which a high-resolution spectrum can be obtained.
Claim 17
Independent Claim
74 words
A Method of displaying spectral features of X-ray radiation from which a high-resolution spectrum can be obtained, that comprises, directing a large cone angle of X-ray radiation upon a substantially large bent crystal adapted to reflect and focus the radiation, reflecting and focusing the radiation toward the focal region of the crystal, and simultaneously detecting all the reflected radiation at an area positioned away from the focal region as a widely dispersed, two-dimensional pattern.
Claim 18
Independent Claim
74 words
A Method of displaying spectral features of X-ray radiation from which a high-resolution spectrum can be obtained, that comprises, directing a large cone angle of X-ray radiation upon a substantially large bent crystal adapted to reflect and focus the radiation, reflecting and focusing the radiation toward the focal region of the crystal, and simultaneously detecting all the reflected radiation at an area positioned away from the focal region as a widely dispersed, two-dimensional pattern.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |