JPH0437071A - Cooler of fluxmeter - Google Patents
Cooler of fluxmeterInfo
- Publication number
- JPH0437071A JPH0437071A JP2144077A JP14407790A JPH0437071A JP H0437071 A JPH0437071 A JP H0437071A JP 2144077 A JP2144077 A JP 2144077A JP 14407790 A JP14407790 A JP 14407790A JP H0437071 A JPH0437071 A JP H0437071A
- Authority
- JP
- Japan
- Prior art keywords
- recondenser
- transport pipe
- container
- main body
- magnetometer
- 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
Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 19
- 239000001307 helium Substances 0.000 abstract description 16
- 229910052734 helium Inorganic materials 0.000 abstract description 16
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract description 16
- 239000007788 liquid Substances 0.000 abstract description 13
- 230000005294 ferromagnetic effect Effects 0.000 abstract description 2
- SWQJXJOGLNCZEY-NJFSPNSNSA-N helium-6 atom Chemical compound [6He] SWQJXJOGLNCZEY-NJFSPNSNSA-N 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 1
- 239000012808 vapor phase Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 230000004907 flux Effects 0.000 description 7
- 230000002411 adverse Effects 0.000 description 6
- 239000003302 ferromagnetic material Substances 0.000 description 5
- 230000000747 cardiac effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 etc. Substances 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、磁束計を冷却するための装置に関する。[Detailed description of the invention] Industrial applications The present invention relates to a device for cooling a magnetometer.
従来の技術
人間の脳、腕、眼球および心臓などの生体から発生され
る微弱な磁界の強さを検出するために、ピックアップコ
イルと超電導量子干渉素子とが組合わされて構成される
磁束計が用いられ、この磁束計は、極低温の液化ガス、
たとえば液体ヘリウム中に浸漬される。Conventional technology In order to detect the strength of weak magnetic fields generated from living bodies such as the human brain, arms, eyes, and heart, a magnetometer is used, which is composed of a pickup coil and a superconducting quantum interference device. This magnetometer is capable of measuring cryogenic liquefied gas,
For example, immersed in liquid helium.
成る先行技術では、液体ヘリウムが蒸発したガスを再凝
縮するための再凝縮器と、その再凝縮器との間で熱媒体
を循環する冷凍機本体とが、前記液化ガスが貯留されて
いる容器の気相部に設けられる。In the prior art, a recondenser for recondensing gas from which liquid helium has evaporated, and a refrigerator body that circulates a heat medium between the recondenser and the container in which the liquefied gas is stored. installed in the gas phase.
このような先行技術では、冷凍機本体にモータが備えら
れ、そのモータは強磁性材料を含むので、磁束計によっ
て、生体などから発生される微弱な磁界の強さを高精度
に検出することができないという大きな問題を有してい
る。In such prior art, the refrigerator body is equipped with a motor, and since the motor contains ferromagnetic material, it is not possible to accurately detect the strength of weak magnetic fields generated by living organisms etc. using a magnetometer. The big problem is that it can't be done.
発明が解決すべき課題
本発明の目的は、微弱な磁界の強さを高精度で測定する
ことができるようにした磁束計の冷却装置を提供するこ
とである。Problems to be Solved by the Invention An object of the present invention is to provide a cooling device for a magnetometer that can measure the strength of a weak magnetic field with high precision.
課題を解決するなめの手段
本発明は、液化ガスを部分的ζ、１′貯留−６るｂ“に
：・）を備え、
磁胃を検出するピックアップ＝ｒ イルと超電導皺ｒＸ
１渉素了とを電磁結合！で構成ａｈ、ろ磁束Ｊ１を、前
記液化ガス中に浸漬ｊ、さらに、
前記容器の気相部て、ピックアップコイルの検出領域か
らずれソ５・位；ηＧ、′配置、Ｘれる再凝縮器４λ−
１再凝縮器に接続され、容器の夕［、（：延ひ、！′！
１．奴体を輸送する輸送管と、
容器の夕１部に設ｉ−＋られ、輸送管（Ｚ゛接続れ、熱
媒体を冷却する冷凍機本体とを含むことを特徴とする磁
束譜の冷力１装置である。Means for Solving the Problem The present invention is equipped with a partial ζ, 1' storage of liquefied gas - 6 ru b" :・), a pick-up for detecting the magnetic stomach, and a superconducting wrinkle rX.
1. Electromagnetic coupling with Wataru Soryo! ah, filtering magnetic flux J1 is immersed in the liquefied gas, furthermore, in the gas phase part of the container, a recondenser 4λ deviated from the detection area of the pickup coil by 5 degrees; −
1 Connected to the recondenser, the container's temperature [,(:enhi,!'!
1. The cooling power of the magnetic flux sheet is characterized by including a transport pipe for transporting the human body, and a refrigerator main body installed at the lower part of the container, connected to the transport pipe (Z), and cooling the heat medium. 1 device.
作 用
本発明に従λば、容器内ζ；”１部分的に貯留され７″
、・液化ガス内に、ピックアップコイルと超電導ｔｆ干
渉素子とをｆＩｉｋる磁束計を浸漬１７、容器内の気相
部に再凝縮器を設け、容器の外部には冷凍機本体を設置
］、冷凍機本体からの冷却され六・熱媒体む再凝縮器に
輸送管によ・′、）で導、′″−１この再１■ｇは、じ
ツクア゛ツブーｊイノ１の検出領域から４″１ノ、゛位
置に配置’ａ ｉ’する１、［、たが゛、〉で強磁性材
）・）を禽む冷凍機本体は、輸送管１．、＝よ・′〉′
Ｃ磁束３１から絣ノ１、ノに容器の外部の位置に設りる
。：どがζ゛きるの”（゛、づ′］の強磁性Ｈ科４．’
、 Ｊ：る磁φ、田への悪影響メ・ド；」ぐ、＝２か４
：゛きる。冷凍機本体がシ１゛磁性＄ｊ料から成るとき
く、二１５い−ｒ ｔ、ｉ 、、その冷凍機・）私１体
り・容器ドから１ｌｌｆ１． ｊｌた位１に設ける４゛
とがζ゛きるのζ５、磁束計への悪影響を防ぐ、−とか
゛（゛、′きる。Effect According to the present invention, ζ is partially stored in the container.
,・Immerse a magnetometer that connects the pickup coil and the superconducting TF interference element in the liquefied gas 17, install a recondenser in the gas phase inside the container, and install the refrigerator main body outside the container], Refrigeration The cooled heat medium from the machine body is guided to the recondenser by a transport pipe, and this re-1 g is 4" from the detection area of the digital boot. The main body of the refrigerator, which is placed in position 'a i' with ferromagnetic material) and ), is placed in the transport pipe 1. ,=yo・′〉′
From the C magnetic flux 31 to Kasuri No. 1 and No., it is provided at a position outside the container. : Ferromagnetic H class 4.'
, J: Negative impact on the magnetic fields, = 2 or 4
:゛kiru. When the main body of the refrigerator is made of magnetic material, 215-rt,i,, the refrigerator...) I am one person and 1llf1. The 4゛ provided at position 1 is ζ5, which prevents an adverse effect on the magnetometer.
また肖’ ａ ｌ１ｌＲ’Ａは、非磁性材料、）、：と
ノばγルミ；−ウムなどの＋（料から成り、磁束計への
悪影響をＯ１及的（、：防ぐことツバで゛きるようにし
、［、かもこの再凝縮器を、ピックアップコイルの検出
領域がずれた・位置に配置ｌ７、これ＆ごよ・つで再凝
縮器による磁束計への悪影響ｆ−層なくすことな′ｉ１
］能ｉ、ｍ ｌ、ているゆ
実施例
第１図は、本発明の一実施例の全体の系統図である。人
間などの被検体１の１一方には、磁束ｔ１２が配置さｉ
］る。この磁束計２は、ピックアップ７．Ｉイル３と超
電導菫了−ｆ渉素了・１とが電磁結合１１．で構成され
る。容器５およびその容器５を塞ぐ大板］ｌは、Ｊ１磁
性断熱材料、たとえばスデ：、！、ス鋼および繊維強化
プラスチックなどから成り、この容器５に液化カスであ
る液体ヘリウム（）が部分的に貯留される。磁束；ｅ＋
２ ｆｔ、この液体ヘリウム０に浸漬される。容器５
の気相部′７には、再凝縮器８が設けられる。この再凝
縮器８は、液体ノ＼リウム６が蒸発した＼リウムガスを
冷却し、で再凝縮器−る。In addition, it is made of non-magnetic materials, such as aluminum and aluminum, and can be used to prevent negative effects on the magnetometer. In this way, the recondenser is placed in a position where the detection area of the pickup coil is shifted, so that the recondenser does not affect the magnetic flux meter by eliminating the negative f-layer.
Embodiment FIG. 1 is an overall system diagram of an embodiment of the present invention. A magnetic flux t12 is placed on one side of the subject 1 such as a human being.
] Ru. This magnetometer 2 has a pickup 7. 11. The I-il 3 and the superconducting superconductor 11. Consists of. Container 5 and a large plate that closes the container 5] l is a J1 magnetic insulation material, such as Sude:,! The container 5 is made of steel, fiber-reinforced plastic, etc., and liquid helium (2), which is liquefied scum, is partially stored in this container 5. Magnetic flux; e+
2 ft. is immersed in this liquid helium. Container 5
A recondenser 8 is provided in the gas phase section '7. This recondenser 8 cools the \lium gas from which the liquid norium 6 has evaporated, and then recondenses it.
再凝縮器８は輸送管９を−ｆ ｔ、で、冷凍機本体１０
に接続される。輸送管９は、容器５の尺板」１を挿通し
、容器５の外に延びる。冷凍機本体】０は、強磁性材料
製壁１２に、］”って磁気シ〜／Ｌ Ｈされて形成され
た部屋に設けられている。ｔなわち、輸送管りを長く［
、て、冷凍機本体１０による超電導ｉ７−］渉素了４へ
の悪影響を防ぐ、に３にしたので、この冷凍機本体１０
を、荊記壁１２によ゛つて磁気シールドされている部屋
内に設ける９ユとが可能となる。なおこの壁］２は、省
略されζもよい。The recondenser 8 connects the transport pipe 9 to the refrigerator main body 10 by -ft,
connected to. The transport pipe 9 passes through the length plate 1 of the container 5 and extends outside the container 5. The refrigerator body 0 is installed in a room formed by magnetic sealing on a wall 12 made of ferromagnetic material.
, to prevent the adverse influence of the refrigerator main body 10 on the superconductivity i7-]
It is now possible to install the device in a room that is magnetically shielded by the wall 12. Note that this wall] 2 may be omitted and ζ may be used.
再凝縮器８および輸送管く９は非磁性材料、たとえばス
ナンレス、＃１なと“の材料から成る。冷凍機本体１０
は、たとノばＧ ＩＶＩ （（：１ｆｆｏｒｃｌ−Ｍｃ
Ｎａｈｏｎ ）冷凍機゛（゛あり、バルブｆ。−タ１３
とデイスプトーサ１４とを含み、デイスゲし−＝η〕４
は、ヒータを備える第１段および第２段ヒートスｙ−イ
〕ヨンおよγ１．Ｉｌリセネ１．・〜りなどを備え、た
どλば２ （’） Ｋに冷却された液体ヘリウムなどの
熱媒体を、ＪＴ（Ｊｏｕｌｅ Ｔｈｏｍｓｏｎ ＞１Ｆ
１．５によって膨張し、こねによつζ得らｈる極低温
の液体ヘリウムを、輸送管９に五′、）゛ζ再凝縮器８
に導き、再凝縮器８からのヘリウムガフ、 ＋ｉ 、輸
送管９を紅て冷凍機本体１０（、、Ｔ戻されて循環され
る。すなわちＧ Ｍ冷凍機本体１０においで２０に程度
に冷却されたヘリウムガスは、ＪＴ弁〕５を通過後、シ
ュ、・ル１〜ムシン効果によ−）ζ゛、液体ヘリウムと
なる。再凝縮器８においで輸送管９かへの熱媒体である
液体ヘリウムは、容器５内の気相部′７のヘリウムガス
と熱交換し、て、その気相部“ｉ内のヘリウムガスを冷
・却する。The recondenser 8 and the transport pipe 9 are made of non-magnetic material, such as Sunanless, #1, etc. Refrigerator main body 10
Ha, Tonoba G IVI ((:1fforcl-Mc
Nahon) Refrigerator (with valve f.-ta 13)
and the disputosa 14, and the disputosa −=η]4
are a first stage and a second stage heat stage equipped with heaters and γ1. Il Lysene 1.・A heating medium such as liquid helium cooled to 2 (') K is heated to a JT (Joule Thomson
The cryogenic liquid helium expanded by 1.5 and obtained by kneading is transferred to the transport pipe 9, )゛ζ recondenser 8.
The helium gaff +i from the recondenser 8 is passed through the transport pipe 9 and returned to the refrigerator main body 10 (T) for circulation. That is, in the GM refrigerator main body 10, it is cooled to about 20 °C. After the helium gas passes through the JT valve 5, it becomes liquid helium due to the Shu, Le 1~Mushin effect. In the recondenser 8, the liquid helium, which is a heat medium to the transport pipe 9, exchanges heat with the helium gas in the gas phase part '7 in the container 5, and the helium gas in the gas phase 'i' is Cooling.
その後、再凝縮器２３内の液体ヘリウムは、気化１．５
てヘリウムガスとなって、輸送管９を辿って、再び冷凍
機本体１０において冷却される。Thereafter, the liquid helium in the recondenser 23 is vaporized to 1.5
It becomes helium gas, follows the transport pipe 9, and is cooled again in the refrigerator main body 10.
磁束計２の検出領域は参照符１７で示されるとおりであ
り、この検出領域１７からずれた位置に再凝縮器８が配
置される。これによって再凝縮器８が磁束計２に悪影響
を及ぼすことを防ぐ。The detection area of the magnetometer 2 is as indicated by reference numeral 17, and the recondenser 8 is disposed at a position offset from this detection area 17. This prevents the recondenser 8 from having an adverse effect on the magnetometer 2.
輸送管９を比較的長くし、たとえば容器５から１．５ｍ
以上離れた位置に冷凍機本体１０を配置することによっ
て、その冷凍機本体１０に備えられているバルブモータ
１３およびディスプレーサ１４などに含まれている強磁
性材料による悪影響を、充分に小さくすることができる
。この磁界は、ビオサバールの法則に従って減衰し、し
たがって上述のように、輸送管９を比較的長くすること
によって、冷凍機本体１０の磁界による磁束計２への悪
影響を上述のように充分に小さくすることができる。ま
た冷凍機本体ｌＯが非磁性材料から成るときにおいても
また、輸送管９を比較的長くすることによって、その冷
凍機本体１０が磁束計に与える悪影響を充分に小さくす
ることができる。The transport pipe 9 is relatively long, for example, 1.5 m from the container 5.
By arranging the refrigerator main body 10 at a distance as described above, it is possible to sufficiently reduce the adverse effects caused by the ferromagnetic material contained in the valve motor 13, displacer 14, etc. provided in the refrigerator main body 10. can. This magnetic field attenuates according to Biot-Savart's law, and therefore, as described above, by making the transport pipe 9 relatively long, the adverse effect on the magnetometer 2 due to the magnetic field of the refrigerator main body 10 can be sufficiently reduced as described above. be able to. Further, even when the refrigerator main body 10 is made of a non-magnetic material, by making the transport pipe 9 relatively long, the adverse effect of the refrigerator main body 10 on the magnetometer can be sufficiently reduced.
輸送管９を比較的長くすることによって、冷凍機本体１
０からの振動による悪影響を防ぐことができる。By making the transport pipe 9 relatively long, the refrigerator main body 1
It is possible to prevent the negative effects of vibrations from zero.
輸送管９が天板１１を挿通する部分には、防振装置１８
が設けられる。この防振装置１８は、輸送管９の振動を
天板１１、したがって容器５および磁束計２に伝達する
ことを防ぐ。A vibration isolator 18 is installed at the portion where the transport pipe 9 passes through the top plate 11.
is provided. This vibration isolator 18 prevents the vibration of the transport pipe 9 from being transmitted to the top plate 11 and therefore to the container 5 and the magnetometer 2.
第２図は、磁束計２の電気回路図である。ピックアップ
コイル３は上下に複数個設けられる。このピックアップ
コイル３は、コイル２０によって超電導量子干渉素子４
に磁気結合される。超電導量子干渉素子４は、超電導リ
ングに１つまたは２つのジョセフソン結合を組合わせた
構成を有する。FIG. 2 is an electrical circuit diagram of the magnetometer 2. A plurality of pickup coils 3 are provided above and below. This pickup coil 3 is connected to a superconducting quantum interference element 4 by a coil 20.
magnetically coupled to. The superconducting quantum interference device 4 has a configuration in which a superconducting ring is combined with one or two Josephson couplings.
この超電導量子干渉素子４は共振回路２１のコイル２２
に電磁結合されて、その出力がライン２３から導出され
る。共振回路２１には、高周波電源２４が接続される。This superconducting quantum interference element 4 is a coil 22 of a resonant circuit 21.
and its output is derived from line 23. A high frequency power source 24 is connected to the resonant circuit 21 .
ピックアップコイル３のうちの最も下のコイル３ａ以外
の残余のコイルおよび超電導量子干渉素子４などは、超
電導材料から成るケース２５内に収納されて磁気シール
ドされる。The remaining coils other than the lowest coil 3a of the pickup coils 3, the superconducting quantum interference element 4, etc. are housed in a case 25 made of superconducting material and are magnetically shielded.
ピックアップコイル３ａの検出領域１７によって検出さ
れる磁束は、コイル２０によって電磁結合された超電導
量子干渉素子４に、逆起電力を発生させ、このことが共
振回路２１のコイル２２によって検出されて、検出磁界
の強さに対応する電気信号がライン２３に導出される。The magnetic flux detected by the detection region 17 of the pickup coil 3a generates a back electromotive force in the superconducting quantum interference element 4 electromagnetically coupled by the coil 20, which is detected by the coil 22 of the resonant circuit 21. An electrical signal corresponding to the strength of the magnetic field is led out on line 23.
本件発明者の実験結果を述べる。第３図（１）は比較例
の実験結果を示している。容器５内に冷凍機本体１０を
配置して被検体１として人間の心磁気を観察したところ
、雑音レベルがきわめて多く、心磁気を正確に検出する
ことが困難であった。The experimental results of the inventor of the present invention will be described. FIG. 3(1) shows the experimental results of a comparative example. When the refrigerator main body 10 was placed in the container 5 and the cardiac magnetism of a human being was observed as the subject 1, the noise level was extremely high and it was difficult to accurately detect the cardiac magnetism.
これに対して、本発明に従い、輸送管９を比較的長くし
て、容器５と冷凍機本体１０との距離を１．６ｍ以上と
し、第１図の実施例において、第３図（２）で示される
心磁気を観測することができた。これによって本発明に
よれば、雑音レベルがきわめて少なく、高精度の心磁気
の測定をすることができることが確認された。In contrast, according to the present invention, the transport pipe 9 is made relatively long so that the distance between the container 5 and the refrigerator main body 10 is 1.6 m or more, and in the embodiment shown in FIG. We were able to observe the cardiac magnetism shown by . As a result, it was confirmed that according to the present invention, the noise level is extremely low and it is possible to measure cardiac magnetism with high precision.
磁束計２は、超電導量子干渉素子４を有する構成だけで
なく、その他の構成を有する磁束計であってもよい。The magnetometer 2 may not only have a configuration including the superconducting quantum interference element 4, but may also have other configurations.
発明の効果
以上のように本発明によれば、強磁性材料を含む冷凍機
本体を、輸送管を介して磁束計から離れた位置に設けて
おくことができるようになり、また再凝縮器をピックア
ップコイルの検出領域からずれた位置に配置することに
よって、微弱な磁界の強さを、高精度で検出することが
可能になる。Effects of the Invention As described above, according to the present invention, the refrigerator main body containing a ferromagnetic material can be provided at a position away from the magnetometer via a transport pipe, and the recondenser can be installed at a location separate from the magnetometer. By arranging it at a position offset from the detection area of the pickup coil, it becomes possible to detect the strength of a weak magnetic field with high precision.
第１図は本発明の一実施例の全体の系統図、第２図は磁
束計２の電気回路図、第３図は本件発明者の実験結果を
示す心磁図である。
１・・・被検体、２・・・磁束計、３・・・ピックアッ
プコイル、４・超電導量子干渉素子、５・・・容器、６
・・・液体ヘリウム、７・・・気相部、８・・・再凝縮
器、９・・輸送管、１０・・・冷凍機本体
代理人 弁理士 画数 圭一部
第
図
詩 間FIG. 1 is an overall system diagram of an embodiment of the present invention, FIG. 2 is an electric circuit diagram of the magnetometer 2, and FIG. 3 is a magnetocardiogram showing the experimental results of the inventor of the present invention. DESCRIPTION OF SYMBOLS 1... Subject, 2... Magnetometer, 3... Pickup coil, 4. Superconducting quantum interference element, 5... Container, 6
...liquid helium, 7...gas phase section, 8...recondenser, 9...transport pipe, 10...refrigeration unit representative patent attorney number of strokes Keiichi 1st figure poem between
Claims (1)
子とを電磁結合して構成される磁束計を、前記液化ガス
中に浸漬し、さらに、 前記容器の気相部で、ピックアップコイルの検出領域か
らずれた位置に配置される再凝縮器と、再凝縮器に接続
され、容器の外に延び、熱媒体を輸送する輸送管と、 容器の外部に設けられ、輸送管に接続され、熱媒体を冷
却する冷凍機本体とを含むことを特徴とする磁束計の冷
却装置。[Claims] A magnetometer equipped with a container that partially stores liquefied gas and configured by electromagnetically coupling a pickup coil that detects a magnetic field and a superconducting quantum interference element is immersed in the liquefied gas, Further, a recondenser disposed in a gas phase part of the container at a position offset from a detection area of the pickup coil, and a transport pipe connected to the recondenser, extending outside the container, and transporting the heat medium. 1. A cooling device for a magnetometer, comprising: a refrigerator body provided outside a container, connected to a transport pipe, and cooling a heat medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02144077A JP3084046B2 (en) | 1990-05-31 | 1990-05-31 | Weak magnetic field detection device with cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02144077A JP3084046B2 (en) | 1990-05-31 | 1990-05-31 | Weak magnetic field detection device with cooling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0437071A true JPH0437071A (en) | 1992-02-07 |
| JP3084046B2 JP3084046B2 (en) | 2000-09-04 |
Family
ID=15353738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02144077A Expired - Fee Related JP3084046B2 (en) | 1990-05-31 | 1990-05-31 | Weak magnetic field detection device with cooling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3084046B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0643232A (en) * | 1992-02-06 | 1994-02-18 | Biomagnetic Technol Inc | Magnetometer and method of measuring magnetic field |
| JPH06109821A (en) * | 1992-09-30 | 1994-04-22 | Toyo Sanso Kk | Measuring probe cooling device of squid fluxmeter |
| JP2006041259A (en) * | 2004-07-28 | 2006-02-09 | Sumitomo Heavy Ind Ltd | Cooling system |
-
1990
- 1990-05-31 JP JP02144077A patent/JP3084046B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0643232A (en) * | 1992-02-06 | 1994-02-18 | Biomagnetic Technol Inc | Magnetometer and method of measuring magnetic field |
| JPH06109821A (en) * | 1992-09-30 | 1994-04-22 | Toyo Sanso Kk | Measuring probe cooling device of squid fluxmeter |
| JP2006041259A (en) * | 2004-07-28 | 2006-02-09 | Sumitomo Heavy Ind Ltd | Cooling system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3084046B2 (en) | 2000-09-04 |
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