DE4232358A1 - Double magnetic coil measuring device for determining shielding effectiveness - has magnetically conducting collars around openings in housing arranged with constant opposing surface separation - Google Patents

Double magnetic coil measuring device for determining shielding effectiveness - has magnetically conducting collars around openings in housing arranged with constant opposing surface separation

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Publication number
DE4232358A1
DE4232358A1 DE19924232358 DE4232358A DE4232358A1 DE 4232358 A1 DE4232358 A1 DE 4232358A1 DE 19924232358 DE19924232358 DE 19924232358 DE 4232358 A DE4232358 A DE 4232358A DE 4232358 A1 DE4232358 A1 DE 4232358A1
Authority
DE
Germany
Prior art keywords
measuring apparatus
magnetic coil
double magnetic
coil measuring
collars
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Withdrawn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
DE19924232358
Other languages
German (de)
Inventor
Joachim Dipl Ing Nedtwig
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.)
Airbus Defence and Space GmbH
Original Assignee
Telefunken Systemtechnik AG
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 Telefunken Systemtechnik AG filed Critical Telefunken Systemtechnik AG
Priority to DE19924232358 priority Critical patent/DE4232358A1/en
Publication of DE4232358A1 publication Critical patent/DE4232358A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
    • G01V3/105—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

The measuring device has a transmission coil arranged coaxially with a receiving coil. Both coils are arranged in respective mu-metal housings (11,12) which have openings (21,22) which lie symmetrically opposite each other, with a gap for inserting a measurement sample. The openings each have a magnetically conducting collar (31,32). The opposing surfaces of the collars are separated by a constant amount. A closed mu-metal frame (6) may be provided in the gap for receiving the measurement sample. The coils pref. have a soft ferrite core. ADVANTAGE - Maximised dynamic range. Homogeneous field distribution around collars, with high flux and reduction in stray fields. 21

Description

Die Erfindung betrifft eine Doppel-Magnetspulen-Meßappara­ tur gemäß dem Oberbegriff des Patentanspruchs 1. Eine sol­ che Meßapparatur ist aus G. Trenkler "Shielding effec­ tiveness of various materials as measured with the near field tester", Texas Instruments, ITEM update 1988, Seite 6 bis 12 bereits bekannt.The invention relates to a double magnetic coil measuring apparatus tur according to the preamble of claim 1. A sol che measuring apparatus is from G. Trenkler "Shielding effec tiveness of various materials as measured with the near field tester ", Texas Instruments, ITEM update 1988, page 6 to 12 already known.

In diesem Bericht ist eine Doppel-Magnetspulen-Meßappara­ tur beschrieben, bestehend aus einer koaxial zu einer Emp­ fangsspule ausgerichteten Sendespule, wobei sich die bei­ den Spulen jeweils in einem an einer Seite offenen Gehäuse aus µ-Metall befinden. Die beiden Gehäuse stehen sich mit ihren Öffnungen spiegelsymmetrisch derart gegenüber, daß zwischen den beiden Gehäusen ein Spalt zur Einführung einer Meßprobe vorhanden ist. Mittels dieser Anordnung ist die Schirmdämpfung von Meßproben in einem eng begrenzten Dynamikbereich meßbar. Infolge der konstruktiven Gestal­ tung der Anordnung treten zwischen Sendespule und dem zu­ gehörigen Gehäuse an dessen Öffnung nicht vernachlässig­ bare Streufelder auf, welche zu bedeutenden magnetischen Streuflüssen zwischen Sendespule und Gehäuse und damit zu entsprechend schwachen Empfangssignalen führen, die einen zusätzlichen Verstärker auf Seiten der Empfangsspule er­ forderlich machen. Ferner sind Sende- und Empfangsspule unterschiedlich aufgebaut.In this report is a double solenoid measuring apparatus described, consisting of a coaxial to an Emp catch coil aligned transmitter coil, the at the coils in an open housing on one side made of µ metal. The two housings stand with each other opposite their openings mirror-symmetrically such that a gap for insertion between the two housings  a test sample is available. By means of this arrangement the shielding attenuation of test samples in a narrowly limited range Dynamic range measurable. As a result of the constructive shape device between the transmitter coil and the proper housing at its opening is not negligible visible stray fields, which lead to significant magnetic Leakage fluxes between the transmitter coil and the housing and thus too correspondingly weak reception signals that lead to additional amplifier on the receiving coil side make demands. There are also transmitting and receiving coils structured differently.

Der Erfindung liegt die Aufgabe zugrunde, eine Meßappara­ tur zu schaffen, mittels der die Schirmdämpfung von Meß­ proben mit möglichst einfachen Meßmitteln in einem mög­ lichst großen Dynamikbereich bestimmt werden kann.The invention has for its object a measuring apparatus to create by means of which the shielding attenuation of measuring samples with the simplest possible measuring equipment in one possible wide dynamic range can be determined.

Die erfindungsgemäße Lösung der Aufgabe ist durch die kennzeichnenden Merkmale des Patentanspruchs 1 wiedergege­ ben. Die Unteransprüche enthalten vorteilhafte Aus- und Weiterbildungen der Erfindung.The achievement of the object is by characteristic features of claim 1 reproduced ben. The sub-claims contain advantageous training and Developments of the invention.

Die erfindungsgemäße Lösung der Aufgabe besteht darin, daß bei einer Meßapparatur der eingangs genannten Art die Öff­ nungen der beiden Gehäuse jeweils mit einem nach außen weisenden magnetisch leitenden Kragen versehen sind und daß die sich gegenüberliegenden Oberflächen der beiden Kragen konstanten oder zumindest annähernd konstanten Ab­ stand haben.The achievement of the object is that in a measuring apparatus of the type mentioned in the opening openings of the two housings, each with an outside facing magnetically conductive collar and that the opposite surfaces of the two Collar constant or at least approximately constant ab have stood.

Die Vorteile der Erfindung bestehen einerseits in der sehr homogenen Feldverteilung im Bereich des Kragens, wodurch ein hoher magnetischer Kreisfluß und eine geringe Ausbil­ dung von Streufeldern erreicht wird. Andererseits ist die erfindungsgemäße Anordnung leicht, preiswert und material­ sparend herstellbar. Ein zusätzlicher Verstärker ist in­ folge des hohen magnetischen Kreisflusses nicht erforder­ lich.The advantages of the invention are on the one hand in the very homogeneous field distribution in the area of the collar, whereby  a high magnetic circuit flux and a low training stray fields is reached. On the other hand, it is Arrangement according to the invention light, inexpensive and material Can be produced economically. An additional amplifier is in due to the high magnetic circuit flux not required Lich.

Die Erfindung sei nachfolgend exemplarisch anhand der nicht maßstäblichen Figuren verdeutlicht. Es zeigten:The invention is exemplary based on the figures not drawn to scale. It showed:

Fig. 1 eine vorteilhafte Ausführungsform der erfindungs­ gemäßen Doppel-Magnetspulen-Meßapparatur; Figure 1 shows an advantageous embodiment of the inventive double magnetic coil measuring apparatus.

Fig. 2 eine vorteilhafte Ausführungsform eines Rahmens mit einer Meßprobe, welcher in der Doppel-Magnet­ spulen-Meßapparatur nach Fig. 1 einsetzbar ist. Fig. 2 shows an advantageous embodiment of a frame with a measurement sample, which can be used in the double magnet coil measuring apparatus according to Fig. 1.

Die in Fig. 1 gezeigte Doppel-Magnetspulen-Meßapparratur enthält eine koaxiäl zu einer (nicht gezeigten) Empfangs­ spule ausgerichtete Sendespule 71. Vorzugsweise sind die beiden Spulen elektrisch bzw. mechanisch gleich aufgebaut.The double magnetic coil measuring apparatus shown in FIG. 1 contains a transmission coil 71 coaxially aligned with a reception coil (not shown). The two coils are preferably constructed electrically or mechanically the same.

Die beiden Spulen sind jeweils in einem an einer Seite of­ fenen Gehäuse 11, 12 aus µ-Metall untergebracht. Die bei­ den Gehäuse 11, 12 stehen sich mit ihrer Öffnungen 21, 22 spiegelsymmetrisch derart gegenüber, daß zwischen den bei­ den Gehäusen 11, 12 ein Spalt 4 zur Aufnahme einer (in Fig. 1 nicht gezeigten) Meßprobe vorhanden ist. Um den in­ neren Aufbau der Meßapparatur besser zeigen zu können, wurde in der Fig. 1 ein Abstand zwischen den beiden Gehäu­ sen 11, 12 gewählt, der deutlich größer ist als der bei Messungen sich üblicherweise ergebende Abstand, der von der Dicke der zu untersuchenden Meßprobe abhängt.The two coils are each housed in a housing 11 , 12 made of μ-metal on one side. The openings 21 , 22 in the housings 11 , 12 are mirror-symmetrical in such a way that a gap 4 is present between the housings 11 , 12 for receiving a measurement sample (not shown in FIG. 1). In order to better show the inner structure of the measuring apparatus, a distance between the two housings 11 , 12 was selected in FIG. 1, which is significantly larger than the distance that usually results from measurements, which depends on the thickness of the specimen to be examined Measurement sample depends.

Wie an der Figur erkennbar ist, sind die Öffnungen 21, 22 der beiden Gehäuse 11, 12 je mit einem jeweils nach außen weisenden Kragen 31, 32 versehen. Die sich gegenüberlie­ genden Oberflächen der beiden Kragen 31, 32 weisen kon­ stanten oder einen zumindest näherungsweise konstanten Ab­ stand auf, wodurch der bereits erwähnte Spalt 4 zwischen den beiden Spulen gebildet wird. In diesen Spalt 4 wird nun die Meßprobe eingebracht und untersucht. Besonders vorteilhaft hat es sich dabei erwiesen, wenn die Meßprobe von einem Rahmen aus µ-Metall eingerahmt ist, der den Spalt 4 zwischen den beiden Spulen außerhalb des Meßfeldes allseitig begrenzt.As can be seen from the figure, the openings 21 , 22 of the two housings 11 , 12 are each provided with an outwardly facing collar 31 , 32 . The surfaces of the two collars 31 , 32 lying opposite each other have constant or at least approximately constant levels, whereby the already mentioned gap 4 is formed between the two coils. The measurement sample is now introduced into this gap 4 and examined. It has proven particularly advantageous if the measurement sample is framed by a frame made of μ-metal, which delimits the gap 4 between the two coils on all sides outside the measurement field.

Eine besonders vorteilhafte Ausführungsform eines solchen Rahmens (mit Meßprobe) ist in Fig. 2 gezeigt. In dieser Ausführungsform wird eine flächige Meßprobe 5 von einem umlaufenden Rahmen 6 aus µ-Metall eingerahmt, dessen ma­ gnetische Leitfähigkeit vorzugweise größer ist als die der Meßprobe 5.A particularly advantageous embodiment of such a frame (with measurement sample) is shown in FIG. 2. In this embodiment, a flat measurement sample 5 is framed by a peripheral frame 6 made of μ-metal, the magnetic conductivity of which is preferably greater than that of the measurement sample 5 .

Während der Messung ist der (in sich geschlossene) Rahmen 6 im Bereich der sich gegenüberliegenden Kragen 31, 32 der beiden Gehäuse 11, 12 im Spalt 4 angeordnet. Die bei­ den Kragen 21, 22 und der Rahmen 6 sind untereinander deckungsgleich. Das Verhältnis zwischen der äußeren Kra­ genrandkantenlänge und der inneren Kragenrandkantenlänge liegt bei etwa 0,8. Es können jedoch auch andere Verhält­ nisse gewählt werden, die vorzugsweise im Bereich zwischen ca. 0 5 und ca. 0 8 liegen und beispielsweise den Wert 0,6 annehmen können.During the measurement, the (self-contained) frame 6 is arranged in the area 4 of the opposing collars 31 , 32 of the two housings 11 , 12 in the gap 4 . The collar 21 , 22 and the frame 6 are congruent with each other. The ratio between the outer collar edge length and the inner collar edge length is approximately 0.8. However, other ratios can also be selected, which are preferably in the range between approximately 0 5 and approximately 0 8 and can assume the value 0.6, for example.

Die Spulen sind jeweils mit einem Metallkern 7, z. B. mit einen Ferritkern zur Homogenisierung des Feldes in der Spule und im Spalt 4 versehen.The coils are each with a metal core 7 , z. B. with a ferrite core for homogenizing the field in the coil and in the gap 4 .

In einer bevorzugten konkreten Ausbildung der Meßapparatur nach Fig. 1 betragen der Gehäuseinnenkantenlängen des je­ weiligen Gehäuses in etwa 5 bis 6 cm und der Spulenaußen­ durchmesser der jeweils zugehörigen Spule in etwa 3 bis 4 cm, bei einer Betriebsfrequenz von in etwa 0 Hz bis 30 MHz.In a preferred specific embodiment of the measuring apparatus according to FIG. 1, the housing inner edge lengths of the respective housing are approximately 5 to 6 cm and the coil outer diameter of the respectively associated coil is approximately 3 to 4 cm, with an operating frequency of approximately 0 Hz to 30 MHz .

Die Erfindung ist nicht auf die gezeigten Ausführungsbei­ spiele beschränkt, sondern sinngemäß auf weitere übertrag­ bar. So ist es z. B. möglich, kreiszylinderförmige Gehäuse mit integrierten zylindrisch ausgebildeten Spulen zu re­ alisieren.The invention is not based on the embodiments shown games limited, but analogously to further transmission bar. So it is z. B. possible, circular cylindrical housing with integrated cylindrical coils to the right alize.

Claims (7)

1. Doppel-Magnetspulen-Meßapparatur, bestehend aus einer koaxial zu einer Empfangsspule ausgerichteten Sendespule, wobei sich die beiden Spulen jeweils in einem an einer Seite offenen Gehäuse aus µ-Metall befinden und die beiden Gehäuse mit ihren Öffnungen sich spiegelsymmetrisch derart gegenüberstehen, daß zwischen den beiden Gehäusen ein Spalt zur Einführung einer Meßprobe vorhanden ist, dadurch gekennzeichnet, daß die Öffnungen (21, 22) der beiden Ge­ häuse (11, 12) je mit einem jeweils nach außen weisenden magnetisch leitenden Kragen (31, 32) versehen sind und daß die sich gegenüberliegenden Oberflächen der beiden Kragen (31, 32) konstanten oder zumindest annähernd konstanten Abstand haben.1. Double magnetic coil measuring apparatus, consisting of a coaxially aligned to a receiving coil transmitting coil, the two coils are each in an open on one side housing made of µ-metal and the two housings with their openings face each other in mirror symmetry such that between the two housings there is a gap for introducing a measurement sample, characterized in that the openings ( 21 , 22 ) of the two housings ( 11 , 12 ) are each provided with an outwardly facing magnetically conductive collar ( 31 , 32 ) and that the opposite surfaces of the two collars ( 31 , 32 ) have a constant or at least approximately constant distance. 2. Doppel-Magnetspulen-Meßapparatur nach Anspruch 1, da­ durch gekennzeichnet, daß im Bereich der sich gegenüber­ liegenden Kragen (31, 32) der beiden Gehäuse (11, 12) im Spalt (4) ein in sich geschlossener Rahmen (6) aus µ-Metall zur Aufnahme der Meßprobe (5) angeordnet ist, der zur Einführung der Meßprobe (5) dient.2. Double magnetic coil measuring apparatus according to claim 1, characterized in that in the region of the opposite collars ( 31 , 32 ) of the two housings ( 11 , 12 ) in the gap ( 4 ) from a self-contained frame ( 6 ) µ-metal for receiving the measurement sample ( 5 ) is arranged, which serves to introduce the measurement sample ( 5 ). 3. Doppel-Magnetspulen-Meßapparatur nach Anspruch 2, da­ durch gekennzeichnet, daß die beiden Kragen (31, 32) un­ tereinander und/oder der Rahmen (6) und mindestens einer der beiden Kragen (31, 32) deckungsgleich oder zumindest annähernd deckungsgleich sind.3. Double magnet coil measuring apparatus according to claim 2, characterized in that the two collars ( 31 , 32 ) un one above the other and / or the frame ( 6 ) and at least one of the two collars ( 31 , 32 ) are congruent or at least approximately congruent are. 4. Doppel-Magnetspulen-Meßapparatur nach einem der vor­ hergehenden Ansprüche, dadurch gekennzeichnet, daß die Spulen jeweils mit einem weichmagnetischen Metallkern (7), insbesondere mit einen Ferritkern versehen sind.4. Double magnetic coil measuring apparatus according to one of the preceding claims, characterized in that the coils are each provided with a soft magnetic metal core ( 7 ), in particular with a ferrite core. 5. Doppel-Magnetspulen-Meßapparatur nach Anspruch 4, da­ durch gekennzeichnet, daß das Verhältnis zwischen der äußeren Kragenrandkantenlänge und der inneren Kragenrand­ kantenlänge zwischen ca. 0,5 und ca. 0,8, vorzugsweise bei etwa 0,6 liegt.5. Double magnetic coil measuring apparatus according to claim 4, there characterized in that the relationship between the outer collar edge length and the inner collar edge edge length between about 0.5 and about 0.8, preferably at is about 0.6. 6. Doppel-Magnetspulen-Meßapparatur nach Anspruch 5, da­ durch gekennzeichnet, daß die Leitfähigkeit des Rahmens (6) größer ist als die der Meßprobe (5).6. Double magnetic coil measuring apparatus according to claim 5, characterized in that the conductivity of the frame ( 6 ) is greater than that of the test sample ( 5 ). 7. Doppel-Magnetspulen-Meßapparatur nach einem der vorhe­ rigen Ansprüche, dadurch gekennzeichnet, daß die Sende- und die Empfangsspule in etwa den gleichen mechanischen und/oder elektrischen Aufbau aufweisen und vorzugsweise gegeneinander vertauschbar sind.7. Double magnetic coil measuring apparatus according to one of the above claims, characterized in that the transmission and the receiving coil is roughly the same mechanical and / or have electrical structure and preferably are interchangeable.
DE19924232358 1992-09-26 1992-09-26 Double magnetic coil measuring device for determining shielding effectiveness - has magnetically conducting collars around openings in housing arranged with constant opposing surface separation Withdrawn DE4232358A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924232358 DE4232358A1 (en) 1992-09-26 1992-09-26 Double magnetic coil measuring device for determining shielding effectiveness - has magnetically conducting collars around openings in housing arranged with constant opposing surface separation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924232358 DE4232358A1 (en) 1992-09-26 1992-09-26 Double magnetic coil measuring device for determining shielding effectiveness - has magnetically conducting collars around openings in housing arranged with constant opposing surface separation

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322987A1 (en) * 1993-07-09 1995-02-23 Erwin Halstrup Coil for generating an alternating magnetic field
DE19731790A1 (en) * 1997-07-24 1999-01-28 Bosch Gmbh Robert Device for detecting an alternating current
WO1999031497A1 (en) * 1997-12-12 1999-06-24 Opex Corporation Apparatus and method for detecting documents having ferrous objects
DE19920986A1 (en) * 1999-03-23 2000-10-19 Dehn & Soehne Shielding quality assessment method, for electrical equipment or chamber, based on comparison of LF or MF broadcast signal field strength within and outside screened area
CN101813732A (en) * 2010-05-10 2010-08-25 中国人民解放军理工大学 Shielding effectiveness testing system for near-zone low-frequency strong magnetic field and testing method thereof
CN102735972A (en) * 2012-06-20 2012-10-17 西安空间无线电技术研究所 Method for detecting electromagnetism leakage degree of passive product
CN109239469A (en) * 2018-08-16 2019-01-18 江苏赛诺格兰医疗科技有限公司 The device and method for detecting magnetic shielding material Magnetic Shielding Effectiveness under downfield

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322987A1 (en) * 1993-07-09 1995-02-23 Erwin Halstrup Coil for generating an alternating magnetic field
DE19731790A1 (en) * 1997-07-24 1999-01-28 Bosch Gmbh Robert Device for detecting an alternating current
WO1999031497A1 (en) * 1997-12-12 1999-06-24 Opex Corporation Apparatus and method for detecting documents having ferrous objects
US6114646A (en) * 1997-12-12 2000-09-05 Opex Corporation Apparatus and method for detecting documents having ferrous objects
DE19920986A1 (en) * 1999-03-23 2000-10-19 Dehn & Soehne Shielding quality assessment method, for electrical equipment or chamber, based on comparison of LF or MF broadcast signal field strength within and outside screened area
CN101813732A (en) * 2010-05-10 2010-08-25 中国人民解放军理工大学 Shielding effectiveness testing system for near-zone low-frequency strong magnetic field and testing method thereof
CN102735972A (en) * 2012-06-20 2012-10-17 西安空间无线电技术研究所 Method for detecting electromagnetism leakage degree of passive product
CN109239469A (en) * 2018-08-16 2019-01-18 江苏赛诺格兰医疗科技有限公司 The device and method for detecting magnetic shielding material Magnetic Shielding Effectiveness under downfield
CN109239469B (en) * 2018-08-16 2021-11-02 江苏赛诺格兰医疗科技有限公司 Device and method for detecting magnetic shielding effect of magnetic shielding material under low magnetic field

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OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
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Owner name: DEUTSCHE AEROSPACE AG, 8000 MUENCHEN, DE

8120 Willingness to grant licenses paragraph 23
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Owner name: DAIMLER-BENZ AEROSPACE AKTIENGESELLSCHAFT, 80804 M

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