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EP1772874A2 - Diaphragme orienté vers le foyer - Google Patents

Diaphragme orienté vers le foyer Download PDF

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Publication number
EP1772874A2
EP1772874A2 EP06121864A EP06121864A EP1772874A2 EP 1772874 A2 EP1772874 A2 EP 1772874A2 EP 06121864 A EP06121864 A EP 06121864A EP 06121864 A EP06121864 A EP 06121864A EP 1772874 A2 EP1772874 A2 EP 1772874A2
Authority
EP
European Patent Office
Prior art keywords
radiation
absorption element
focal point
aperture
focusing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06121864A
Other languages
German (de)
English (en)
Other versions
EP1772874B1 (fr
EP1772874A3 (fr
Inventor
Dr. Rer. Nat. Kurt Osterloh
Prof. Dr. Uwe Ewert
Heinz-Jürgen KNISCHEK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bundesanstalt fuer Materialforschung und Pruefung BAM
Original Assignee
Bundesanstalt fuer Materialforschung und Pruefung BAM
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bundesanstalt fuer Materialforschung und Pruefung BAM filed Critical Bundesanstalt fuer Materialforschung und Pruefung BAM
Publication of EP1772874A2 publication Critical patent/EP1772874A2/fr
Publication of EP1772874A3 publication Critical patent/EP1772874A3/fr
Application granted granted Critical
Publication of EP1772874B1 publication Critical patent/EP1772874B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21KTECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators

Definitions

  • the invention relates to a focal point-oriented diaphragm according to the preamble of claim 1 and a method for producing the same according to the preamble of claim 12.
  • a fundamental problem of X-ray, gamma and neutron beams is the extremely low, practically unusable refraction compared to visible light, which makes it virtually impossible to redirect and focus the radiation to produce an optical image, except in a few cases such as in systems with bundled capillaries for soft X-rays. Also, the deflection of this radiation by reflections is only possible with soft radiation, which also images by means of mirror arrangements are out of the question. In order to produce a controllable beam with a given strength in a desired direction, the suppression of all unwanted radiation must first be effected with the aid of collimators.
  • a gamma spectrometer is positioned which receives radiation from a predetermined direction by means of a collimator system. If it is possible to move this collimator system so that a surface is scanned uniformly line by line, then the spectrum of a radiation can be mapped in this way. Such an arrangement can always make sense if more spectral information is required than that which a flat detector can optionally provide with filter attachments.
  • the object of the invention is to provide a diaphragm, which is provided in particular for high-energy radiation and which allows a rapid displacement of the direction of a beam which passes through a focal point.
  • this object is achieved by means of a focus-oriented aperture with the features mentioned in claim 1 or by means of a method for producing the same with the features mentioned in claim 12.
  • the absorption element can perform a periodic movement and is shaped such that in each position taken during the periodic movement at most one direction exists with the property that radiation, in particular radiation of a particular type of radiation, which falls on a beam passing through a focal point on the diaphragm , is substantially transmitted when the beam is substantially in said direction and otherwise substantially absorbed.
  • radiation type here is radiation of a certain Wavelength range understood (eg X-ray) or radiation, which consists of certain particles (eg neutron radiation).
  • Such a focal point-oriented diaphragm is suitable for two general optical arrangements, firstly an arrangement in which a beam source is positioned at the focal point and a beam is guided by means of the diaphragm over an object to be examined, whose scattered radiation is then measured by a detector, or secondly Arrangement in which the object to be examined itself produces radiation and the diaphragm serves to direct the radiation of a specific point of the object onto a detector in focus.
  • the selection property of the diaphragm with respect to the beam direction can, on the one hand, relate to radiation of all kinds (regardless of wavelengths and / or particle nature) or, on the other hand, be restricted to a specific type of radiation.
  • the diaphragm simultaneously transmits radiation of a first type of radiation (for example X-radiation) in a first direction and radiation of a second type of radiation (for example neutron radiation) in a second direction.
  • a first type of radiation for example X-radiation
  • a second type of radiation for example neutron radiation
  • the different types of radiation can be manifested by different wavelength ranges in electromagnetic waves or by the contrast of particle-electromagnetic radiation.
  • a detection of all relevant measurement points in the object to be examined or on the surface of the same is made possible if at least one of the three components - focus, aperture, object - during the periodically repeating movement of the diaphragm is offset either stepwise or continuously appropriate.
  • the direction selected by the diaphragm naturally refers to a finite solid angle range, which, however, should be suitably limited in order to be able to regard the thus selected measuring range on or in the object to be examined as sufficiently punctiform.
  • the simplest and according to the order of the easiest to realize periodic movement is a rotational movement about a predetermined axis of rotation.
  • the direction vectors selected by the diaphragm then reproduce at least every 360 °. Also obvious are repetitions of the same direction vector every 180 °, 120 °, etc.
  • the resulting rotating aperture can be rotated almost as fast as desired, limits are set by the registration electronics rather than by the mechanical axis bearing and the drive.
  • the absorption element has at least one slit-shaped gap or a slit-shaped region which absorbs the radiation at least to a small extent. This occurs when the direction selected by the shutter changes continuously during the periodic movement.
  • the directions of the radiation selected by the diaphragm lie on a plane, in particular the plane which is defined during a rotational movement of the diaphragm through its axis of rotation and the focal point.
  • the positions of the measuring points on the object to be examined are thus on one line.
  • the cutting beam (electromagnetic radiation or of matter), which serves for the at least partial removal of the material from the absorption element, thus has the same geometric course as the beam which is selected by the manufactured absorption element. It is preferred, during the removal of the material, to let the absorption element carry out at least one period of the periodic movement performed during operation of the diaphragm. Then the high-energy beam describes the same direction changes as the beam selected during operation of the diaphragm.
  • High-pressure water jet cutting is a modern form of cutting technology that delivers a high quality of cut. Fresh water is strongly compressed by a special high-pressure pump, so that a cutting pressure of about 3800 bar can be achieved, and then accelerated through a fine nozzle to a multiple of the speed of sound. If the absorption element consists of harder materials, the cutting performance can be increased by the addition of abrasives.
  • FIG. 1 shows schematically an arrangement with the invention, generally designated 100 aperture.
  • An absorption element 10 in the form of a cylinder of radiation-absorbing material is rotatably suspended about a central longitudinal axis 12. Through the absorption element 10, one or more slits 14 extend.
  • a point-shaped radiation source is positioned, which emits radiation of a specific wavelength range at least in the direction of the absorption element 10.
  • the shape of the slit 14 is designed so that rays emanating from the focal point 16 are absorbed by the absorption element 10, with the exception of a single beam, which runs in a specific selection direction 18.
  • the transmitted beam 18 falls on a specific measuring point 22 of the object 20 to be examined.
  • the radiation backscattered by measuring point 22 is picked up by a detector (not shown).
  • the absorption element 10 is subject to a rotation about the axis of rotation 12. This can be carried out as a uniform movement, which can be maintained even with heavy, massive design using a low-friction axle bearing without great effort. Only the start-up phase requires more energy due to the necessary acceleration.
  • the selection direction 18 of the beam transmitted through the slot 14 changes. When rotated through 180 °, this beam passes over the surface of a fan from the focal point 16 through the axis of rotation 12. The measuring point 22 thus scanned on the surface of the object 20 moves on a line 24.
  • the geometry shown in FIG. 1 can also be applied to the case in which the object 20 to be examined itself is a radiation source.
  • a detector is then positioned, which captures and measures the radiation emitted by the object 20, which is transmitted by the absorption element 10.
  • the absorption element 10 or the slot 14 selects the direction 18 of the transmitted beam, which falls on the detector at the focal point 16 and, analogously to the first case, starts from a measuring point 22 which forms around the axis of rotation 12 during the rotation of the absorption element 10 a line 24 moves.
  • the absorption element 10 in the form of a solid cylinder and an embodiment in the form of a hollow cylinder or a pipe is conceivable if the wall thickness ensures sufficient absorption.
  • the choice of material of the absorption element 10 depends on the nature of the radiation to be shielded, heavy metals such as copper or tungsten for hard X-ray or gamma radiation or polyethylene for neutron radiation.
  • FIG. 2 shows the operation of the focus-oriented aperture in different rotational positions of the absorption element 10.
  • the opening angle ⁇ is shown with the focal point 16 and above the cylindrical absorption element 10 with the slot openings 14a and 14b.
  • the two slot openings 14a, b have a different length due to the finite angle ⁇ .
  • the exact dimensions of the slot openings 14a, b are determined by the opening angle ⁇ and the distance d of the focal point 16 from the axis of rotation 12.
  • the rotational positions shown in the partial images of the figure are displayed in the schematic inserts bottom left by the arrow directions.
  • the partial images a to c thus represent different rotational positions.
  • the courses of the slot openings 14a, b on the unrolled cylinder jacket are shown as a phase diagram. Therein, the different length of the slot openings 14a, b is particularly clear. Shown are also the top 26 and the bottom 28 of the cylinder 10.
  • the in the respective rotational position of the aperture 100 transmitted beam 18 is marked in the upper partial images as an arrow and thus indicates entry and exit position on the cylinder surface.
  • the arrow directions marked in FIG. 2, which represent the transmitted beam 18, have an orientation which corresponds to a beam source positioned at the focal point 16. Because of the reversibility of the beam guidance, these arrows could also run in exactly the opposite direction if the object 20 to be examined itself is a beam source and a detector is positioned at the focal point 16.
  • the central beam is transmitted as in the first zero position.
  • One of the two boundary lines between top 26 and bottom 28 corresponds to the surface line on the cylinder 10, which is closest to the focal point 16 and through which the selected beam 16 passes.
  • each beam passage through the center of the cylinder 10 corresponds to a phase shift of 180 ° between the entrance and exit points on the surface of the cylinder 10.
  • FIG. 3 illustrates the integration of the absorption element 10 into an arrangement with shielding elements 32 (view from above).
  • the absorption element 10 is flanked by two shields 32 with hollow cylindrical end faces, in which it can rotate freely.
  • a controlled drive 34 is to be mounted so that it engages the upper or lower extension of the rotation axis 12, without any part of it can protrude into the beam path.
  • a precise position control 36 communicates with the data acquisition, not shown. Suitable for this purpose is a stepper motor with precise step counting or a position control on the cylinder 10 itself.
  • the drive unit 34 can be integrated into the shield 32 or attached to the side facing away from the radiation. To the mechanics are high requirements because of the exact angular position control to put (direct gear or chain transmission).
  • Each second centrally extending beam through the aperture 100 is in a preferred embodiment switching technically or mechanically with a synchronized further, not shown aperture (in wing design o. ⁇ .) Hidden. This can be accomplished by turning off the emitter in the second half of each rotational movement, when short switching times are possible, or mute the receiver electronics. Should both be difficult or impossible, the rotation can be coupled to an unillustrated shutter which closes the beam path during the second half turn. As long as an electronic hiding the second half-rotation is possible, this is the preferred solution, whereby short sampling times are possible with fast rotational movement.
  • the respective position of the measuring point 22 is communicated to the registering system via the simultaneous state of the rotating cylinder 10. This can be done via a stepper motor or a stroboscope device on the upper or lower edge of the cylinder.
  • the result of a usable half-turn of the cylinder 10 is thus the sweeping of the transmitted beam 18 over a fan, whereby a line 24 is scanned on the object 20 to be examined.
  • the focal point 16 is guided at a fixed radius about the axis of rotation 12 as far as the shielding device 32 permits. In this case, the shielding device 32 itself does not need to be moved.
  • the displacement of the measuring line 24 on the object 20 in a direction perpendicular to the axis of rotation 12 achieved in that the object 20 on a stationary structure of the aperture 100 (eg on a conveyor belt) or vice versa a mobile device with the Aperture 100 is guided past the object 20.
  • a stationary structure of the aperture 100 eg on a conveyor belt
  • FIG 4 shows an arrangement in which the absorption element has different absorption materials which are effective for different types of radiation.
  • the use of such an arrangement lends itself when the object 20 or a radiation source located in the focal point 16 does not (predominantly) emit homogeneous radiation which can be screened with one and the same material (example: isotope source with different types of radiation such as 252 Ca).
  • the absorption element 10 has a hollow cylindrical shell 38 made of a first, for a first radiation type absorbing material M1, for example a heavy metal, which is suitable for shielding X-rays and gamma rays.
  • the cylindrical core portion 40 is composed of a second material M2 absorbing for a second radiation type, for example a hydrogen-rich material such as polyethylene or a light element such as boron for neutron absorption.
  • the passage slots 14 in the cylinder parts 38 and 40 which are each effective for a beam type, offset from each other, for example, at an angle of 90 ° about the axis of rotation.
  • more than one beam passes through the absorption element for a certain period of the rotation period, but only at most one for each particular type of radiation.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Gas Separation By Absorption (AREA)
  • Surgical Instruments (AREA)
  • Powder Metallurgy (AREA)
  • Electron Beam Exposure (AREA)
EP06121864A 2005-10-06 2006-10-06 Diaphragme orienté vers le foyer Not-in-force EP1772874B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005048519A DE102005048519A1 (de) 2005-10-06 2005-10-06 Brennpunktorientierte Blende

Publications (3)

Publication Number Publication Date
EP1772874A2 true EP1772874A2 (fr) 2007-04-11
EP1772874A3 EP1772874A3 (fr) 2007-08-22
EP1772874B1 EP1772874B1 (fr) 2009-01-14

Family

ID=37769388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06121864A Not-in-force EP1772874B1 (fr) 2005-10-06 2006-10-06 Diaphragme orienté vers le foyer

Country Status (3)

Country Link
EP (1) EP1772874B1 (fr)
AT (1) ATE421151T1 (fr)
DE (2) DE102005048519A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010130668A1 (fr) * 2009-05-12 2010-11-18 BAM Bundesanstalt für Materialforschung und -prüfung Système de diaphragme à fente mobile et pivotant
WO2011115923A1 (fr) 2010-03-14 2011-09-22 Rapiscan Systems, Inc. Dispositif de mise en forme de faisceau
CN102565110A (zh) * 2010-12-31 2012-07-11 同方威视技术股份有限公司 一种背散射成像用射线束的扫描装置和方法
CN103728326A (zh) * 2010-12-31 2014-04-16 同方威视技术股份有限公司 一种背散射成像用射线束的扫描装置和方法
CN103776847A (zh) * 2012-10-24 2014-05-07 清华大学 射线发射装置和成像系统
DE102015008272A1 (de) 2015-06-18 2016-12-22 Kurt Osterloh Schlitzblendensystem für bildgebende Verfahren mit harter Strahlung
EP2548012A4 (fr) * 2010-03-14 2017-08-02 Rapiscan Systems, Inc. Système d'inspection d'individus
DE102016004624A1 (de) 2016-04-13 2017-10-19 Kurt Osterloh Das Gammaauge: Ein Gerät zur Abbildung hochenergetisch strahlender Objekte
US10082473B2 (en) 2015-07-07 2018-09-25 General Electric Company X-ray filtration
US10134254B2 (en) 2014-11-25 2018-11-20 Rapiscan Systems, Inc. Intelligent security management system
DE102017005302A1 (de) 2017-05-30 2018-12-06 Kurt Osterloh Gestaltung einer Gammakamera mit einem rotierenden Kollimator zur Darstellung strahlender Objekte
US10720300B2 (en) 2016-09-30 2020-07-21 American Science And Engineering, Inc. X-ray source for 2D scanning beam imaging
CN113936838A (zh) * 2021-10-11 2022-01-14 散裂中子源科学中心 一种两级定位中子光阑切换机构
US11280898B2 (en) 2014-03-07 2022-03-22 Rapiscan Systems, Inc. Radar-based baggage and parcel inspection systems

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007057261B3 (de) * 2007-11-26 2009-08-06 BAM Bundesanstalt für Materialforschung und -prüfung Vorrichtung und Verfahren zur Herstellung von Schlitzblenden
EP2333786B1 (fr) 2009-12-08 2012-02-15 BAM Bundesanstalt für Materialforschung und -prüfung Diaphragme à fente asymétrique ainsi que dispositif et procédé de sa fabrication
CN105810281A (zh) * 2016-05-03 2016-07-27 北京华力兴科技发展有限责任公司 斩波器和背散射成像装置

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US4031401A (en) * 1975-03-14 1977-06-21 American Science & Engineering, Inc. Radiant energy imaging scanning
JPS5293384A (en) * 1976-01-31 1977-08-05 Shimadzu Corp Radiation collimeter for segmental scanning
DE3135421A1 (de) * 1981-09-07 1983-03-24 Siemens AG, 1000 Berlin und 8000 München Roentgenuntersuchungsgeraet
EP0311177B1 (fr) * 1987-10-05 1993-12-15 Philips Patentverwaltung GmbH Système pour examiner un corps avec une source de rayonnement
DE3829688A1 (de) * 1988-09-01 1990-03-15 Philips Patentverwaltung Anordnung zur erzeugung eines roentgen- oder gammastrahls mit geringem querschnitt und veraenderlicher richtung
DE3908966A1 (de) * 1989-03-18 1990-09-20 Philips Patentverwaltung Anordnung zur erzeugung eines roentgen- oder gammastrahls mit geringem querschnitt und veraenderbarer lage
FR2790100B1 (fr) * 1999-02-24 2001-04-13 Commissariat Energie Atomique Detecteur bidimensionnel de rayonnements ionisants et procede de fabrication de ce detecteur
DE60222768T2 (de) * 2001-04-03 2008-07-17 Koninklijke Philips Electronics N.V. Computertomograph

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010130668A1 (fr) * 2009-05-12 2010-11-18 BAM Bundesanstalt für Materialforschung und -prüfung Système de diaphragme à fente mobile et pivotant
WO2011115923A1 (fr) 2010-03-14 2011-09-22 Rapiscan Systems, Inc. Dispositif de mise en forme de faisceau
EP2548207A4 (fr) * 2010-03-14 2017-07-26 Rapiscan Systems, Inc. Dispositif de mise en forme de faisceau
EP2548012A4 (fr) * 2010-03-14 2017-08-02 Rapiscan Systems, Inc. Système d'inspection d'individus
CN102565110A (zh) * 2010-12-31 2012-07-11 同方威视技术股份有限公司 一种背散射成像用射线束的扫描装置和方法
CN103728326A (zh) * 2010-12-31 2014-04-16 同方威视技术股份有限公司 一种背散射成像用射线束的扫描装置和方法
CN103776847A (zh) * 2012-10-24 2014-05-07 清华大学 射线发射装置和成像系统
CN103776847B (zh) * 2012-10-24 2016-04-27 清华大学 射线发射装置和成像系统
US11280898B2 (en) 2014-03-07 2022-03-22 Rapiscan Systems, Inc. Radar-based baggage and parcel inspection systems
US10713914B2 (en) 2014-11-25 2020-07-14 Rapiscan Systems, Inc. Intelligent security management system
US10134254B2 (en) 2014-11-25 2018-11-20 Rapiscan Systems, Inc. Intelligent security management system
DE102015008272A1 (de) 2015-06-18 2016-12-22 Kurt Osterloh Schlitzblendensystem für bildgebende Verfahren mit harter Strahlung
US10082473B2 (en) 2015-07-07 2018-09-25 General Electric Company X-ray filtration
WO2017178568A1 (fr) 2016-04-13 2017-10-19 Kurt Osterloh L'oeil gamma : appareil pour reproduire des objets émettant des rayonnements hautement énergétiques
DE102016004624A1 (de) 2016-04-13 2017-10-19 Kurt Osterloh Das Gammaauge: Ein Gerät zur Abbildung hochenergetisch strahlender Objekte
US10720300B2 (en) 2016-09-30 2020-07-21 American Science And Engineering, Inc. X-ray source for 2D scanning beam imaging
DE102017005302A1 (de) 2017-05-30 2018-12-06 Kurt Osterloh Gestaltung einer Gammakamera mit einem rotierenden Kollimator zur Darstellung strahlender Objekte
WO2018220053A1 (fr) 2017-05-30 2018-12-06 Kurt Osterloh Configuration d'une gamma-caméra comprenant un collimateur rotatif servant à représenter des objets à rayonnement
CN113936838A (zh) * 2021-10-11 2022-01-14 散裂中子源科学中心 一种两级定位中子光阑切换机构
CN113936838B (zh) * 2021-10-11 2023-09-26 散裂中子源科学中心 一种两级定位中子光阑切换机构

Also Published As

Publication number Publication date
EP1772874B1 (fr) 2009-01-14
ATE421151T1 (de) 2009-01-15
EP1772874A3 (fr) 2007-08-22
DE502006002637D1 (de) 2009-03-05
DE102005048519A1 (de) 2007-04-19

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