EP1454154A2 - Dispositif pour le reglage d'un point de fonctionnement d'un capteur de champ magnetique - Google Patents

Dispositif pour le reglage d'un point de fonctionnement d'un capteur de champ magnetique

Info

Publication number
EP1454154A2
EP1454154A2 EP02796208A EP02796208A EP1454154A2 EP 1454154 A2 EP1454154 A2 EP 1454154A2 EP 02796208 A EP02796208 A EP 02796208A EP 02796208 A EP02796208 A EP 02796208A EP 1454154 A2 EP1454154 A2 EP 1454154A2
Authority
EP
European Patent Office
Prior art keywords
control
squid
signal
flow
time constant
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Withdrawn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
EP02796208A
Other languages
German (de)
English (en)
Inventor
Christoph Ludwig
Wolfgang Ludwig
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.)
STL Systemtechnik Ludwig GmbH
Original Assignee
STL Systemtechnik Ludwig 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
Application filed by STL Systemtechnik Ludwig GmbH filed Critical STL Systemtechnik Ludwig GmbH
Publication of EP1454154A2 publication Critical patent/EP1454154A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
    • G01R33/0354—SQUIDS
    • G01R33/0356—SQUIDS with flux feedback

Definitions

  • the present invention relates to a device according to the preamble of patent claim 1.
  • FLL Flux Locked Loop
  • Input variable, output signal U of the SQUID electronics clarify:
  • the output signal is periodic with intervals of a flow quant ⁇ 0 , so that the measurement and correction, in particular of strongly fluctuating measurement signals, is problematic;
  • the analog flow control illustrated by the control loop in particular also in FIG. 1 of DE 196 06 655, operates linearly only within an input signal range of half a flow quantum.
  • the object of the present invention is therefore to expand a generic device for setting an operating point with regard to its usable bandwidth or the usable control range in such a way that, in particular, a measurement range comprising several flow quanta can be compensated for reliably and without hesitation. Accordingly, a device must be created that can be operated reliably even in environments with high magnetic control influences or poor shielding conditions.
  • the flow quantum pump means ensure that flow quanta can be pumped into and out of the SQUID by means of characteristic signal forms, without having to fear control influences from the control unit the control range is expanded accordingly by this possible plurality of flow quanta.
  • the short edge according to the invention (rise when pumping in, falling when pumping out) means that the short edge duration compared to the control time constant of the control unit means that the control loop cannot follow this signal change and consequently does not correct the quantum flow signal; this then leads to the fact that, cf. Fig. 4, by pumping a periodic or flux quantum moving across the periods and thus beyond the ⁇ n / 2 control range of the traditional control loop is possible.
  • the analog flow control is continuously possible, i. H. the dead or delay times for the digital actuating and resetting means known from the prior art and necessary there do not occur, so that in an advantageous manner according to the invention the device according to the present invention is also able to quickly and quickly change signals measuring input signal and also enables significantly higher slew rates.
  • the signal generation unit according to the invention which otherwise generates the signal or pulse shapes according to the invention in a known manner, is coupled into the flow control loop, specifically the control or control signal generated according to the invention acts on the voltage assigned anyway to the flow control loop.
  • Flux converter means which are typically implemented as a coil and then generate the desired flow signal for SQUID from a current or voltage signal.
  • the result is a closed control loop, which in particular overcomes the disadvantages of the hybrid control loop described from the generic state of the art, but is not completely closed, and in particular, as is necessary in the prior art, does not open or the like. Measures of a control loop necessary for a reset for the reasons described above.
  • the signal form according to the invention for pumping in or out such that more than one flow quantum is pumped with a signal pulse; this is preferably done by appropriately designing the amplitude of the signal.
  • control unit according to the invention it is also within the scope of the present invention to assign the control unit according to the invention to digital as well as analog control means, so that a hybrid flow control loop can also be formed within the scope of the present invention.
  • the flow quantum pump means provided according to the invention are a direct component of the hybrid flow control loop and thus enable the analog and digital control means to be operated independently and, in particular, without delay.
  • FIG. 1 shows a schematic block diagram of the present invention according to a first preferred embodiment
  • FIG. 2 shows a signal diagram of an asymmetrical signal form generated by the signal generation unit in FIG. 1 for pumping a flow quantum into the device;
  • Fig. 4 a general signal diagram showing the relationship between magnetic flux as
  • a control unit which is schematically delimited by the boundary line 10, has, in an otherwise known manner, a control or differential amplifier 12 which is assigned to a SQUID 18 and generates a feedback signal in response to a signal difference at the SQUID and feeds a feedback coil 16 via a coupling resistor, which then, with a control time constant t inherent in the control unit, enables the detected signal change to be corrected by generating a corresponding compensation flow.
  • the arrangement shown corresponds to the control circuit arrangement shown in FIG. 1 of DE 196 06 655 AI, with regard to further details for practical implementation thereof Reference is made and otherwise a practical implementation is readily possible for the skilled worker.
  • control circuit is now additionally assigned a signal generation unit 20 as a flux quantum pump, which, in turn, a coupling resistor shown schematically, provides the feedback coil 16 with a flux quantum pump signal or a pump pulse, which according to the invention is used to pump a flux quantum into and out of it SQUID 18 is formed and remains unaffected by the control loop due to its characteristic signal shape, as will be explained below.
  • a signal generation unit 20 as a flux quantum pump, which, in turn, a coupling resistor shown schematically, provides the feedback coil 16 with a flux quantum pump signal or a pump pulse, which according to the invention is used to pump a flux quantum into and out of it SQUID 18 is formed and remains unaffected by the control loop due to its characteristic signal shape, as will be explained below.
  • the waveform generated by the signal generating unit 20 for pumping one (or more) flow quant (s) into it has an asymmetrical contour in the flow-time diagram of FIG. 2, namely such that the rise time ti of the rising edge in the pump signal is short based on the control time constant of the control circuit 10; on the other hand, the duration of the falling edge t 2 of the pump signal of FIG. 2 is long compared to the control time constant t.
  • the signal jumps to the right by one flow quantum and to this extent the control unit additionally having the flow quantum pump can also follow the signal beyond the previous signal width of only half a flow quantum.
  • the falling edge shown in FIG. 2, on the other hand, is in turn corrected by the control loop within the control time constant, so that the SQUID remains at the increased quantum flow level.
  • fast rise times in the range of approx. 10 ns can be achieved, the fall times typically being a factor of 2 longer.
  • high-frequency lines are preferably provided according to the invention.
  • FIG. 3 describes the case analogous to or opposite to FIG. 1 and thus pumping a flow quant out of the SQUID:
  • the rising edge controlled with a slow rise time t 3 is corrected by the control loop, but the falling edge with t 4 is short short for a reaction of the control loop with control loop constant t, so that a flow quantum is pumped out of the SQUID.
  • the present invention is not restricted to the pumping in or out of individual flow quanta, but in particular by suitable (amplitudes) formation of the control signals analogously to FIG. 2, FIG 3 simultaneous pumping of a plurality of flow quanta in both directions is possible.

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

L'invention concerne un dispositif pour le réglage d'un point de fonctionnement d'un capteur de champ magnétique à courbe caractéristique périodique, destiné notamment à un dispositif de détection d'un champ ou d'un flux magnétique. Le dispositif selon l'invention comprend un SQUID en tant que capteur de champ magnétique et une unité de régulation montée en aval du SQUID, présentant une constante temps de réglage (t) et comprenant une boucle de rétroaction qui agit sur le SQUID et est réalisée de façon à opérer autour d'un point parmi une pluralité de points de fonctionnement du SQUID. Selon l'invention, des moyens pompes à flux magnétique affectés au SQUID comprennent une unité de génération de signal qui génère un signal de commande ou de régulation pour le SQUID et sont réalisés de sorte que, pour l'injection ou l'extraction par pompage d'au moins un fluxon dans le SQUID ou hors du SQUID, une forme de signal, générée par l'unité de génération de signal, du signal de commande ou de régulation est différente ainsi qu'asymétrique par rapport à un front montant et à un front descendant d'une forme de signal, un seul des fronts d'une forme de signal étant court par rapport à la constante temps de réglage.
EP02796208A 2001-08-20 2002-08-07 Dispositif pour le reglage d'un point de fonctionnement d'un capteur de champ magnetique Withdrawn EP1454154A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10139883A DE10139883C1 (de) 2001-08-20 2001-08-20 Vorrichtung zum Einstellen eines Arbeitspunktes eines Magnetfeldsensors und ein Verfahren dafür
DE10139883 2001-08-20
PCT/EP2002/008799 WO2003019214A2 (fr) 2001-08-20 2002-08-07 Dispositif pour le reglage d'un point de fonctionnement d'un capteur de champ magnetique

Publications (1)

Publication Number Publication Date
EP1454154A2 true EP1454154A2 (fr) 2004-09-08

Family

ID=7695405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02796208A Withdrawn EP1454154A2 (fr) 2001-08-20 2002-08-07 Dispositif pour le reglage d'un point de fonctionnement d'un capteur de champ magnetique

Country Status (6)

Country Link
US (1) US6917197B2 (fr)
EP (1) EP1454154A2 (fr)
JP (1) JP2005501264A (fr)
AU (1) AU2002333352B2 (fr)
DE (1) DE10139883C1 (fr)
WO (1) WO2003019214A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104950275B (zh) * 2014-03-31 2017-07-21 中国科学院上海微系统与信息技术研究所 超导量子干涉器磁传感器的性能测试装置及方法
CN104198961B (zh) * 2014-07-18 2017-06-13 中国科学院上海微系统与信息技术研究所 采用单个运算放大器的超导量子干涉器磁传感器
CN110118948B (zh) * 2019-06-04 2021-12-21 中国科学院上海微系统与信息技术研究所 一种基于超导量子干涉仪的总场测量方法及装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672359A (en) 1985-11-12 1987-06-09 Trw Inc. Superconducting analog-to-digital converter and digital magnetometer and related method for its use
JPH02257076A (ja) * 1989-03-30 1990-10-17 Fujitsu Ltd ディジタルスクイド制御方式
DE19606655C2 (de) * 1996-02-23 2002-04-11 Forschungszentrum Juelich Gmbh Meßeinrichtung zur Messung magnetischer Felder
JP3655753B2 (ja) * 1998-10-07 2005-06-02 日本電気株式会社 超伝導電流計測回路とそれを用いた電流計測装置
KR100320456B1 (ko) * 1999-04-22 2002-01-16 구자홍 Ｓｑｕｉｄ를 이용한 자기장의 2 차 그레디언트 측정 장치 및

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO03019214A3 *

Also Published As

Publication number Publication date
JP2005501264A (ja) 2005-01-13
AU2002333352B2 (en) 2006-11-16
WO2003019214A2 (fr) 2003-03-06
DE10139883C1 (de) 2003-06-05
US6917197B2 (en) 2005-07-12
WO2003019214A3 (fr) 2004-05-27
US20040207397A1 (en) 2004-10-21

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