US4973845A
Expired / Lapsed
US
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Very high resolution autofluoroscope for ionizing radiation
Assignee: Centre National de la Recherche Scientifique
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Filing: 1988-12-22
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Granted: 1990-11-27
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Expires: 2008-12-22
Abstract
Abstract A very high resolution radiochromatogram for ionizing radiation comprises at least one array made up of a set of filament-like members adapted to enable spatial marking of a surface to be analyzed according to a specific frame of reference and adapted to detect said radiation by scintillation and to transmit light produced by such detection. The array is formed by two groups of optical fibers. Each fiber is disposed along a respective straight line segment defining two orthogonal directions delimiting an analysis plane or surface. At least one of the groups is subdivided into two elementary groups spaced in a direction perpendicular to the analysis plane or surface. The fibers of the elementary groups are parallel.
Inventors
- 👤 Roland Mastrippolito
- 👤 Herve Tricoire
- 👤 Luc Valentin
- 👤 Christophe Raymond
- 👤 Michel Leblanc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:06
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/201; G01T1/161; G01T1/164; G01T1/1641; G01T1/1644
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
118 words
Very high resolution autofluoroscope for ionizing radiation comprising at least one array made up of a set of filament-like members adapted to enable spatial marking of a surface to be analyzed according to a specific frame of reference and adapted to detect said radiation by scintillation and to transmit light produced by such detection, wherein said array is formed by two groups of optical fibers, each fiber is disposed along a respective straight line segment defining two orthogonal directions delimiting an analysis plane or surface, and at least one of said groups is subdivided into two elementary groups which are spaced in a direction perpendicular to said analysis plane or surface and the fibers of which are parallel.
Claim 2
Dependent Claim
118 words
Very high resolution autofluoroscope for ionizing radiation comprising at least one array made up of a set of filament-like members adapted to enable spatial marking of a surface to be analyzed according to a specific frame of reference and adapted to detect said radiation by scintillation and to transmit light produced by such detection, wherein said array is formed by two groups of optical fibers, each fiber is disposed along a respective straight line segment defining two orthogonal directions delimiting an analysis plane or surface, and at least one of said groups is subdivided into two elementary groups which are spaced in a direction perpendicular to said analysis plane or surface and the fibers of which are parallel.
Claim 3
Dependent Claim
33 words
Autofluoroscope according to claim 1 wherein one of said groups is subdivided into two elementary groups the optical fibers of which are on the same side of the other group of optical fibers.
Claim 4
Dependent Claim
32 words
Autofluoroscope according to claim 1 wherein one of said groups is subdivided into two elementary groups the optical fibers of which are on opposite sides of the other group of optical fibers.
Claim 5
Dependent Claim
29 words
Autofluoroscope according to claim 1 wherein both said groups are subdivided into elementary groups the optical fibers of which are interleaved by virtue of said elementary groups being interleaved.
Claim 6
Dependent Claim
14 words
Autofluoroscope according to claim 1 wherein all said optical fibers have the same diameter.
Claim 7
Dependent Claim
30 words
Autofluoroscope according to claim 1 wherein said optical fibers have different diameters and the optical fibers having the smallest diameter constitute an elementary group adapted to form said analysis surface.
Claim 8
Dependent Claim
19 words
Autofluoroscope according to claim 6 wherein the optical fibers of said two groups have diameters in the ratio 1/2.
Claim 9
Dependent Claim
57 words
Autofluoroscope according to claim 1 wherein said optical fibers are grouped at one end to form subsets and said subsets constituting the first and second elementary groups constituting the first group, constituting the second group and constituting the first and second elementary groups constituting the second group are coupled to first and second pluralities of detector means.
Claim 10
Dependent Claim
42 words
Autofluoroscope according to claim 8 wherein each of said, first and second pluralities of detector means comprise two or one multidynode photomultiplier(s), according to whether said groups are subdivided, each photocathode of each multidynode photomultiplier being coupled to one of said subsets.
Claim 11
Dependent Claim
11 words
Autofluoroscope according to claim 9 wherein said multidynode photomultipliers are self-synchronized.
Claim 12
Dependent Claim
45 words
Autofluoroscope according to claim 9 further comprising means for detecting coincidences in the signal delivered by the detector means of the same level and transcoding means for establishing the rank of the corresponding optical fiber on the basis of coincident detection by two detector means.
Claim 13
Dependent Claim
65 words
Autofluoroscope according to claim 11 wherein said means for detecting coincidences means comprise, coupled to each detector means amplifier means delivering an amplified signal, threshold comparator means receiving said amplified signal and delivering a logic signal in the presence of an amplified signal above the threshold value, and logic comparator means operating on the state of the logic signal delivered by said threshold comparator means.
Claim 14
Dependent Claim
74 words
Autofluoroscope according to claim 12 wherein the rank of the fiber affected by detection by scintillation is given by the logic equation: i=(Fj,r,i)∩(Fj+p,r,i) in which F(f,r,i) and F(j+p,r,i) represent the subsets of rank j and j+p of the same group or elementary group of the same level r for which the logic signal delivered by the corresponding detector means of the same level r and of rank k=j and k'=j+p has the value 1.
Claim 15
Dependent Claim
180 words
Autofluoroscope according to claim 12 further comprising a microcomputer and a coincidence monostable and wherein said threshold comparator means comprise a plurality of elementary threshold comparator circuits, one of said elementary comparator circuits receiving the signal delivered by the anode of the first or second or third multidynode photomultiplier, the other elementary comparator circuits receiving on a first input the signal delivered by a dynode of the first photomultiplier, second photomultiplier or third photomultiplier and on a blocking second input a negative pulse signal delivered by said coincidence monostable, and a plurality of AND circuits, one of said AND circuits receiving on a first input the signal delivered by said threshold comparator circuit and on another input the signal delivered by said threshold comparator circuit through the intermediary of a delay line, the other AND circuits receiving on a first input the signal delivered by said one of said AND circuits and on a second input the signal delivered by said threshold comparator circuits, the outputs of said other AND circuits and of said monostable being connected to said microcomputer.
Claim 16
Dependent Claim
96 words
Autofluoroscope according to claim 14 wherein said transcoding means comprise a processing program memorized in said microcomputer, said program for determining the rank of the fibers affected by scintillation detection making it possible to solve for each group or elementary group the logic equation: i=(Fj,r,i)·(Fj+p,r,i) in which F(j,r,i) and F(j+p,r,i) represent the subsets of rank j and j+p of the same group or elementary group of the same level r for which the logic signal delivered by the corresponding detector means of the same level r and of rank k=j and k'=j+p has the value 1.
References Cited (Backward Citations)
US3308438A
Cited
GB1150919A
Cited
US4298796A
Cited
US4284890A
Cited
US4437007A
Cited
JPS60159675A
Cited
US4598202A
Cited
FR2582100A1
Cited
US4788436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |