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DE19519517A1 - Multi-channel system using multiple rf SQUIDs for medial diagnosis - Google Patents

Multi-channel system using multiple rf SQUIDs for medial diagnosis

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Publication number
DE19519517A1
DE19519517A1 DE1995119517 DE19519517A DE19519517A1 DE 19519517 A1 DE19519517 A1 DE 19519517A1 DE 1995119517 DE1995119517 DE 1995119517 DE 19519517 A DE19519517 A DE 19519517A DE 19519517 A1 DE19519517 A1 DE 19519517A1
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DE
Grant status
Application
Patent type
Prior art keywords
rf
squids
multi
channel
system
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.)
Withdrawn
Application number
DE1995119517
Other languages
German (de)
Inventor
Yi Dr Zhang
Helmut Dr Soltner
Norbert Wolters
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.)
Forschungszentrum Julich GmbH
Original Assignee
Forschungszentrum Julich GmbH
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

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/02Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/035Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
    • G01R33/0354SQUIDS

Abstract

The multi-channel system has at least one HTSC rf SQUID. The rf Squids have high frequencies in the range e.g. of 10 MHz to 20 GHz. The rf SQUIDs (1-n) are inductively coupled to their respective tank resonant circuits (LC). Each resonant circuit works with one and the same frequency. So that n can assume a value e.g. of 2 or 3 but also 20 or more, respectively according to specified limiting condition of an intended use.

Description

Die Erfindung betrifft ein Mehrkanalsystem gemäß dem Oberbegriff des Anspruchs 1. The invention relates to a multi-channel system according to the preamble of claim 1.

Mehrkanalsysteme auf der Basis von LTS-SQUIDs werden zur medizinischen Diagnostik von Herzerkrankungen (Magnetokardiographie) in einer Vielzahl von medizini schen Zentren eingesetzt. Multi-channel systems on the basis of LTS-SQUIDs are used for medical diagnosis of heart disease (magnetocardiography) in a variety of Medical Intern rule centers. Seit der Entdeckung der Hochtemperatursupraleitern (HTSL) ist es möglich gewor den, SQUIDs mit diesen neuen Keramiken herzustellen. Since the discovery of high-temperature superconductors (HTSC) is gewor possible to produce SQUIDs with these new ceramics.

Für den Betrieb von solchen Mehrkanalsystemen finden als SQUIDs überwiegend dc-SQUIDs Verwendung. For the operation of such a multi-channel systems as SQUIDs predominantly dc-SQUIDs are used. Im Gegen satz dazu werden neulich auch rf-SQUIDs verwendet, die bei hohen Frequenzen im Bereich von beispielsweise 10 MHz bis zu 20 GHz einsetzbar sind. In contrast, even rf-SQUIDs are used recently, which are used at high frequencies in the range, for example 10 MHz to 20 GHz.

Ein Problem bei der Erstellung von Vielkanalsystemen auf der Basis von rf-SQUIDs ist durch eine gegenseitige Detektion der Hochfrequenzstrahlung der einzelnen Kanä len untereinander gegeben. A problem with the preparation of multi-channel systems on the basis of rf-SQUIDs to each other is given by a mutual len detection of high-frequency radiation of the individual Kanae.

Es wurde bereits im Stand der Technik erkannt, daß eine Möglichkeit, diese Schwierigkeit zu umgehen darin be steht, unterschiedliche Tankschwingkreisfrequenzen für unterschiedliche Kanäle zu verwenden. It has already been recognized in the prior art that a way to circumvent this difficulty is the fact be to use different tank circuit frequencies for different channels. Dieses Prinzip wird aber wegen der zu großen insgesamt benötigten Fre quenzbreite, insbesondere für viele Kanäle, unpraktika bel. This principle is but quenzbreite because of too large total required Fri, especially for many channels, unpraktika bel. Hinzu kommt, daß bei dieser Methode für jeden Ka nal eine eigene Elektronik zur Verfügung stehen muß. In addition, with this method for each chan nel own electronics must be available.

Diese Tankschwingkreise beeinflussen sich untereinander (man denke an Voltage Controlled Oscillators (VCO), die für jeden Kanal eingebaut sein müssen und viel Leistung aufnehmen), nehmen viel Platz in Anspruch und sind auch recht kostspielig. This tank resonant circuits affect each other (think of Voltage Controlled Oscillators (VCO) that must be installed for each channel and much performance record), take up much space and are also quite expensive. Ein solches System mit verschiedenen Frequenzen ist z. Such a system with different frequencies for. B. aus DE 40 28 301 bekannt. For example, from DE 40 28 301..

Es ist deshalb Aufgabe der Erfindung ein Mehrkanalsy stem mit rf-SQUIDs bereitzustellen, das eine verbesser te Unterdrückung bis hin zur Vermeidung der gegenseiti gen Detektion einzelner Kanäle aufweist. It is therefore an object of the invention, a stem with Mehrkanalsy rf-SQUIDs provide having a Improvement te suppression up to avoid gegenseiti gene detection of individual channels.

Die Erfindung wird gelöst durch ein Mehrkanalsystem nach Anspruch 1. The invention is achieved by a multi-channel system according to Claim. 1

Aufgrund des Einsatzes einer Schaltungsanordnung zur sequenziellen An- oder Abkopplung der einzelnen Tank schwingkreise, wird die Wirkung erzielt, daß mit eine gegenseitige Detektion vermieden wird und mehrere abge fragte Signale von einer einzigen Elektronik weiterver arbeitet werden können. Due to the use of a circuit arrangement for sequentially coupling or decoupling of the individual tank resonant circuits, the effect is obtained that is avoided with a mutual detection and several abge said signals can be developed by a single electronic weiterver.

Eine vorteilhafte Ausführungsform des Mehrkanalsystems liegt dann vor, wenn wenigstens ein der n-rf-SQUIDs oder bis zu alle n-rf-SQUIDs auf der Basis von HTSL- Materialien zum Einsatz kommen. An advantageous embodiment of the multichannel system exists when a join at least the n-rf-SQUIDs or up to all n-rf-SQUIDs based on HTS materials are used. Die mit dieser Materi alklasse verbundenen Vorteile kommen dem Mehrkanalsy stem voll zu Gute. The alklasse with this Materi associated benefits come the Mehrkanalsy stem fully good.

In der Fig. 1 ist das erfindungsgemäße Mehrkanalsystem dargestellt. In FIG. 1, multi-channel system of the invention is illustrated. Hier werden n Stück rf-SQUIDs 1 bis n in duktiv an ihre jeweiligen Tankschwingkreise LC gekop pelt, die alle bei ein und derselben Frequenz arbeiten. Here n pieces rf-SQUID 1 to n are pelt productively gekop to their respective tank resonant circuits LC, all of which operate at the same frequency. Dabei kann n einen Wert von beispielsweise 2 oder 3 aber auch von 20 oder mehr annehmen, je nach gegebener Randbedingung einer beabsichtigten Anwendung. It can also take of 20 or more n has a value of for example 2 or 3 but, depending on the given boundary conditions of an intended application.

Die Tankschwingkreise LC bis L n C n und damit die SQUIDs 1 bis n werden, mit jeweils einem Anpassungswiderstand A, A n vorgeschaltet, sequentiell von einer gemeinsamen Elektronik betrieben. The tank resonant circuits LC to L n C n, and thus the SQUIDs 1 to n, are connected upstream with a respective matching resistor A, A n are sequentially operated by a common electronics. Ermöglicht wird dies durch einen HF-Schalter K1, der periodisch alle Tankschwingkreise LC bis L n C n nacheinander an die Elektronik an- und wie der abkoppelt. This is made possible by an RF switch K1, the periodically every tank resonant circuits LC to L n C n successively arrival to the electronics and how the disconnects. Ein VCO (Voltage Controlled Oscillator) und ein VCA (Voltage Controlled Attanuator) werden durch synchron arbeitende TTL-Schalter betrieben, eben so wie die Integration für das Ausgangssignal durch ei nen synchron arbeitenden Schalter K4 erfolgt. A VCO (Voltage Controlled Oscillator) and a VCA (Voltage Controlled Attanuator) are operated by synchronously operating TTL switch, just as the integration for the output signal by NEN ei synchronously operating switch K4 is performed.

Claims (2)

  1. 1. Mehrkanalsystem mit mehreren, jeweils einen Tankschwingkreis aufweisenden rf-SQUIDs und einer Elektronik zwecks Weiterverarbeitung des aufgenommenen Signals eines einzelnen SQUIDs, gekennzeichnet durch eine Schaltungsan ordnung zur sequenziellen An- oder Abkopplung der einzelnen Tankschwingkreises an die Elektronik. 1. Multi-channel system having multiple, each having a tank circuit comprising rf-SQUIDs and an electronics for further processing of the recorded signal of a single SQUID, characterized by a Schaltungsan order for sequential coupling or decoupling of each tank circuit to the electronics.
  2. 2. Mehrkanalsystem nach Anspruch 1, gekennzeichnet durch wenigstens einen HTSL- rf-SQUID. 2. The multi-channel system according to claim 1, characterized by at least one HTS rf-SQUID.
DE1995119517 1995-06-01 1995-06-01 Multi-channel system using multiple rf SQUIDs for medial diagnosis Withdrawn DE19519517A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1995119517 DE19519517A1 (en) 1995-06-01 1995-06-01 Multi-channel system using multiple rf SQUIDs for medial diagnosis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1995119517 DE19519517A1 (en) 1995-06-01 1995-06-01 Multi-channel system using multiple rf SQUIDs for medial diagnosis

Publications (1)

Publication Number Publication Date
DE19519517A1 true true DE19519517A1 (en) 1996-12-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE1995119517 Withdrawn DE19519517A1 (en) 1995-06-01 1995-06-01 Multi-channel system using multiple rf SQUIDs for medial diagnosis

Country Status (1)

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DE (1) DE19519517A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017062143A1 (en) * 2015-10-07 2017-04-13 Northrop Grumman Systems Corporation Superconducting cross-bar switch system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5093618A (en) * 1989-07-10 1992-03-03 Fujitsu Limited Multi-channel squid fluxmeter with time division feedback
DE4028301A1 (en) * 1990-09-06 1992-03-12 Forschungszentrum Juelich Gmbh Multi-channel system with squids to measure the spatial distribution of magnetic fluxes
US5355085A (en) * 1990-03-20 1994-10-11 Fujitsu, Ltd. Multichannel SQUID flux meter having multiplexed SQUID flux sensors
DE4324700A1 (en) * 1993-07-23 1995-01-26 Forschungszentrum Juelich Gmbh Method for producing an HTSC (Hi-Tc) SQUID containing a Josephson contact
US5406201A (en) * 1991-11-07 1995-04-11 Seiko Instruments Inc. Magnetic field detecting circuit having a relaxation oscillator SQUID

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5093618A (en) * 1989-07-10 1992-03-03 Fujitsu Limited Multi-channel squid fluxmeter with time division feedback
US5355085A (en) * 1990-03-20 1994-10-11 Fujitsu, Ltd. Multichannel SQUID flux meter having multiplexed SQUID flux sensors
DE4028301A1 (en) * 1990-09-06 1992-03-12 Forschungszentrum Juelich Gmbh Multi-channel system with squids to measure the spatial distribution of magnetic fluxes
US5406201A (en) * 1991-11-07 1995-04-11 Seiko Instruments Inc. Magnetic field detecting circuit having a relaxation oscillator SQUID
DE4324700A1 (en) * 1993-07-23 1995-01-26 Forschungszentrum Juelich Gmbh Method for producing an HTSC (Hi-Tc) SQUID containing a Josephson contact

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017062143A1 (en) * 2015-10-07 2017-04-13 Northrop Grumman Systems Corporation Superconducting cross-bar switch system
US9929978B2 (en) 2015-10-07 2018-03-27 Northrop Grumman Systems Corporation Superconducting cross-bar switch system

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