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EP0398918A1 - Ecran magnetique, notamment sur des installations pour analyses biomagnetiques, ainsi que procede pour sa fabrication - Google Patents

Ecran magnetique, notamment sur des installations pour analyses biomagnetiques, ainsi que procede pour sa fabrication

Info

Publication number
EP0398918A1
EP0398918A1 EP89901709A EP89901709A EP0398918A1 EP 0398918 A1 EP0398918 A1 EP 0398918A1 EP 89901709 A EP89901709 A EP 89901709A EP 89901709 A EP89901709 A EP 89901709A EP 0398918 A1 EP0398918 A1 EP 0398918A1
Authority
EP
European Patent Office
Prior art keywords
magnetic shielding
htsl
shielding according
tubes
magnetic
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.)
Ceased
Application number
EP89901709A
Other languages
German (de)
English (en)
Inventor
Hans-Eckhardt Hoenig
Franz BÖMMEL
Reiner Müller
Karl-Heinz Gunzelmann
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0398918A1 publication Critical patent/EP0398918A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0075—Magnetic shielding materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
    • C04B35/4504—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing rare earth oxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
    • C04B35/4512—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing thallium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
    • C04B35/4521—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/01—Manufacture or treatment
    • H10N60/0268—Manufacture or treatment of devices comprising copper oxide
    • H10N60/0661—Processes performed after copper oxide formation, e.g. patterning
    • H10N60/0716—Passivating
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/20—Permanent superconducting devices
    • H10N60/203—Permanent superconducting devices comprising high-Tc ceramic materials

Definitions

  • Magnetic shielding in particular for devices for bio-magnetic investigations, and methods for their production
  • the invention relates to a magnetic shield, in particular for devices for biomagnetic examinations.
  • the invention relates to a method for producing such a magnetic shield.
  • Magnetic shielding is required for many areas of technology. Particularly in the case of biomagnetic investigations in which the smallest signals are to be measured, there is a requirement to create cells with a relatively large volume shielded. Cabins made of ⁇ -metal and / or aluminum are known for this (see monograph BIOMAGNETISM, Springer Verlag (1981) and 3. Phys. E.: Sei. Instrum. 20 (1987), 151 to 164), the thick-walled and / or are constructed with multiple shells.
  • Shielding for biomagnetic investigations in particular must ensure interference field shielding, in particular in the frequency range from 1 kHz down to about 0.1 Hz for interference field amplitudes, generally significantly smaller than the earth's field of about 0.5 Oersted.
  • the known ferromagnetic shields even in combination with eddy current shields, shield with increasing frequency, especially below 100 Hz, worse and worse. A great deal of effort must therefore be expended with such shields in order to be able to separate biomagne signals lying below 10 Hz from interference fields in the environment.
  • superconducting shields are able to shield down to the lowest frequencies.
  • containers coated with superconducting materials and helium-cooled they have been known for some time and are also used in sentence.
  • sensitive cryoelectronic circuits are shielded.
  • Such superconducting shields have so far not been economically justifiable for larger areas to be shielded, for example entire rooms of significantly more than 10 m.
  • the object of the invention is therefore to propose a new magnetic shielding device and a method for its production, with which larger areas as a whole can be shielded with reasonable effort.
  • a grid-like envelope structure is formed from a plurality of tubes through which a coolant flows, and in that the tubes are provided with a layer of a ceramic high-temperature superconductor.
  • Such shielding can be produced comparatively simply with the following process steps:
  • the invention advantageously uses the new high-temperature superconducting materials (HTSL) with jump temperatures in the area of liquid nitrogen in the field of shielding. Particularly in the case of devices for biomagnetic examinations, in which large examination rooms have to be shielded, considerable savings can be achieved compared to multi-layer ⁇ -metal / aluminum eddy current shieldings. It is advantageous that, when flowing through HTSL-coated pipes, there is a smaller surface area compared to total wall cooling, which for heat radiation or supply. Adequate mechanical stability is nevertheless ensured. Interference fields caused by moving current-carrying or magnetic parts cannot occur with the grid-like envelope structure made of the stable tubes.
  • the HTSL-coated tubes can be used to form superconducting meshes of a predetermined size, which completely shield any change in the magnetic flux caused from outside if the current density falls below the critical one.
  • a largely field-free screen area can thus be achieved in the center of the grid-like envelope structure.
  • the invention thus provides a technically comparatively simple and material-appropriate solution for a large-volume shielding cabin and the associated manufacturing process.
  • the thermal spraying process can be, for example, a plasma spraying process or a high-temperature flame spraying process, with which closed thick layers 20 .mu.m can be applied in a suitable manner. It has already been proposed to apply HTSL layers to surfaces of almost any design using such spraying methods.
  • Show it 1 shows a schematic representation of the principle of a mesh-like envelope structure which essentially forms a spherical envelope
  • FIG. 3 shows the connection point of cells according to FIG. 2 with pipe fitting pieces
  • FIG. 4 shows the section through a tube coated with a high-temperature superconducting material.
  • a lattice-like envelope structure is denoted by 10, which consists of a large number of individual tubes 1 connected to one another at connecting points 20.
  • a three-dimensional network with polygonal meshes is formed from the tubes 1, for example from quadrilaterals or triangles, which are designated by 25 in FIG. 1.
  • the envelope structure 10 can thus be implemented, for example, as a spherical envelope which surrounds a measuring space.
  • the grid-like envelope structure 10 is largely closed off. At the bottom there is an enlarged inlet 11 with a distributor ring 12 for liquid nitrogen and at the top an expanded outlet 14 with a gas collecting ring 13. It is essential that no enlarged meshes are allowed to arise through which the magnetic fields to be shielded could penetrate from outside. If necessary, tubular protuberances are made in the almost spherical shielding.
  • the tubes 1 can each form specially triangular elementary meshes which complement each other to form a hexagonal network.
  • any geometries for a spherical envelope structure, in particular the spherical envelope according to FIG. 1, can be realized.
  • the size of the triangular mesh can be calculated according to the required shielding effect.
  • the grid-like envelope structure 10 is first constructed mechanically from the tubes 1, which advantageously consist of non-magnetic steel, and welded together. It is important that the pipe sections 1 are connected at the connection points 20 by means of continuous pipe fittings, in such a way that nitrogen can flow through the entire pipe structure in the liquid and possibly also in the gaseous state as a coolant uniformly without bumping, in order to create vibration-related interference fields avoid.
  • FIG. 3 shows a pipe fitting piece 30 of this type, which in principle consists of a round distributor with corresponding approaches for accommodating six pipes 1, which ensure that the transition between a pipe 1 and a fitting projection 31 is smooth. After the casing structure has been assembled, the welded transitions on the fittings 30 are smoothed, at least on the outside thereof.
  • the entire mechanical structure is with a layer of one Provide high temperature superconductors.
  • Layers based on the four-substance system yttrium-barium-copper oxide (Y-Ba-Cu-0) were tested.
  • This ceramic superconductor has the stoichiometric composition - YBa o 2Cu3.0-7, -x._ and one
  • the layers of the high-temperature superconducting material can also be based on the currently known five-substance systems such as bismuth strontium calcium copper oxygen (Bi-Sr-Ca-Cu-O) or thallium - Barium-calcium-copper-oxygen (Tl-Ba-Ca-Cu-O) should be built up.
  • These HTSL materials also have step temperatures above the temperature of liquid nitrogen, with step temperatures of 80 K and 110 K in certain Bi-Sr-Ca-Cu-O phases and in certain Tl-Ba-Ca-Cu O phases
  • the HTSL coating is applied by means of plasma spraying or high-speed flame spraying.
  • an intermediate layer is first advantageously applied as an adhesive base, for example made of zirconium oxide, at least on the outside of the tubular grid casing, and then the powdery high-temperature superconducting material is sprayed on under suitable boundary conditions.
  • Suitable implementable holders for guiding the coating device can be hung in various positions in the stable tubular grille casing, so that the HTSL coating can be carried out continuously in successive individual steps.
  • HTSL-coated pipe section 1 in section, which - starting from the inside - consists of a steel wall 2 on which a zirconium oxide layer 3 is applied, which carries the HTSL layer 5.
  • zirconium oxide instead of zirconium oxide as a primer and / or protective layer, magnesium oxide, yttrium oxide or silver can optionally also be used.
  • the HTSL layer is applied according to the mechanical structure in the manner described above and, if necessary, coated with zirconium oxide.
  • the desired superconducting properties are then adjusted in a known manner by sintering the HTSL material in an oxygen atmosphere, in particular the critical current density sufficient above 77 K (boiling point of the liquid nitrogen).
  • the latter can, for example, be carried out continuously, piece by piece, by means of high-frequency heating by means of flat coils guided on corresponding devices, or also using a welding gas / oxygen flame from welding torches.
  • the required sintering conditions can be maintained by non-contact temperature measurement, for example using a bolometer, and by an appropriate control.
  • Such a foam layer is designated by 8 in FIG. Due to the structure of the continuous from above
  • a coherent network of superconducting meshes is created for the tubular structure of the tube, which shields field changes from the outside in that each mesh receives the extensive magnetic flux for itself.
  • the static field must be temporarily compensated for by auxiliary coils outside the tubular grille cover 10 during the cooling process to 77 K, but only for the time of the cooling process from T> Tt_ * to the working temperature of about 77 K must exist.
  • the mesh size of the tubular grid network 10 can be matched to the current density available for the high-temperature superconductor and the HTSL layer thickness, the overall dimensions of the construction and the required shielding conditions within a central shielding region, ie an inner partial volume of the envelope structure.
  • the shielding structure can be accessed via the open mesh.
  • the input mesh can be enlarged so that easy access is made possible, the network in Surrounding this opening - as indicated with reference to FIG. 1 - is preferred tubular.
  • a magnetic shield is thus created, which is characterized by the combination of the greatest possible mechanical stability with the lowest temperature gradient in the high-temperature superconductor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)
  • Details Of Measuring And Other Instruments (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Abstract

Les écrans magnétiques pour analyses biomagnétiques sont actuellement réalisés sous forme de cellules compactes en micrométal et aluminium. Des écrans supraconducteurs refroidis à l'hélium sont en revanche réalisables et exploitables de manière rentable uniquement pour des cellules d'un volume relativement faible. Selon la présente invention, une structure enveloppante (10) du type quadrillé est formée d'une multiplicité de tubes (1) parcourus par un réfrigérant et pourvus d'une couche (5) d'un matériau céramique supraconducteur à haute température. Dans le procédé pour la fabrication d'un écran magnétique de ce type, on réalise d'abord mécaniquement la structure tubulaire complète qui est ensuite revêtue, par pistolage thermique, des couches nécessaires d'un matériau supraconducteur à haute température d'épaisseur appropriée.
EP89901709A 1988-02-01 1989-01-26 Ecran magnetique, notamment sur des installations pour analyses biomagnetiques, ainsi que procede pour sa fabrication Ceased EP0398918A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3802902 1988-02-01
DE3802902 1988-02-01

Publications (1)

Publication Number Publication Date
EP0398918A1 true EP0398918A1 (fr) 1990-11-28

Family

ID=6346387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89901709A Ceased EP0398918A1 (fr) 1988-02-01 1989-01-26 Ecran magnetique, notamment sur des installations pour analyses biomagnetiques, ainsi que procede pour sa fabrication

Country Status (3)

Country Link
EP (1) EP0398918A1 (fr)
JP (1) JPH03503448A (fr)
WO (1) WO1989007321A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2139579C1 (ru) * 1998-12-23 1999-10-10 Тюняев Владимир Николаевич Устройство для защиты от излучения (варианты)
RU2187846C2 (ru) * 2001-05-07 2002-08-20 Байков Юрий Александрович Устройство для защиты от излучения
WO2002091389A1 (fr) * 2001-05-07 2002-11-14 Iouri Baikov Dispositif de protection contre les rayonnements (variantes)
GB201116948D0 (en) 2011-10-03 2011-11-16 Rolls Royce Plc A magnetic shield

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU955214A1 (ru) * 1981-03-16 1982-08-30 Предприятие П/Я А-1742 Магнитный экран

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8907321A1 *

Also Published As

Publication number Publication date
JPH03503448A (ja) 1991-08-01
WO1989007321A1 (fr) 1989-08-10

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