JPH01138423A - Liquid volume meter for liquid nitrogen - Google Patents
Liquid volume meter for liquid nitrogenInfo
- Publication number
- JPH01138423A JPH01138423A JP29651287A JP29651287A JPH01138423A JP H01138423 A JPH01138423 A JP H01138423A JP 29651287 A JP29651287 A JP 29651287A JP 29651287 A JP29651287 A JP 29651287A JP H01138423 A JPH01138423 A JP H01138423A
- Authority
- JP
- Japan
- Prior art keywords
- liquid nitrogen
- liquid
- superconductor wire
- resistance value
- ammeter
- 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.)
- Pending
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000007788 liquid Substances 0.000 title claims abstract description 77
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 59
- 239000002887 superconductor Substances 0.000 claims abstract description 24
- 229910009203 Y-Ba-Cu-O Inorganic materials 0.000 claims abstract 3
- 230000007423 decrease Effects 0.000 abstract description 6
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007725 thermal activation Methods 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は液体窒素の液量の測定に用いることができる液
体窒素液量計に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid nitrogen meter that can be used to measure the amount of liquid nitrogen.
従来の技術
近年、エックス線微小分析器において、エネルギー分散
型が多く用いられてきている。ところがエネルギー分散
型エックス線微小分析器においてはエックス線検出器と
して分解能を上げるために半導体検出器が用いられてい
る。ところが半導体検出器はその性能劣化を防止するた
め常時検出器を液体窒素で冷却しなければならない、そ
のためエネルギー分散型エックス線微小分析器は液体窒
素保存容器を備え、これが空にならないように液体窒素
を補充しなければならない。BACKGROUND OF THE INVENTION In recent years, energy dispersive type X-ray microanalyzers have been increasingly used. However, in energy dispersive X-ray microanalyzers, semiconductor detectors are used as X-ray detectors in order to increase resolution. However, semiconductor detectors must be constantly cooled with liquid nitrogen to prevent their performance from deteriorating. Therefore, energy dispersive X-ray microanalyzers are equipped with a liquid nitrogen storage container, and liquid nitrogen is kept in the container to prevent it from emptying. Must be replenished.
以下図面を参照しながら従来の液体窒素液量計について
説明する。第２図は従来の液体窒素液量計の構成図であ
り、１はＩＣ熱電対、２は熱起動電力検出計、３は液体
窒素、４は液体窒素保存容器である。１の熱電対は４の
液体窒素保存容器の入口から一端が底面近くに達するよ
うに挿入され、他端は４の液体窒素保存容器の入口に配
置され、導線で２の熱起電力検出計に接続されている。A conventional liquid nitrogen liquid meter will be described below with reference to the drawings. FIG. 2 is a configuration diagram of a conventional liquid nitrogen liquid meter, in which 1 is an IC thermocouple, 2 is a thermal activation power detector, 3 is liquid nitrogen, and 4 is a liquid nitrogen storage container. The thermocouple No. 1 is inserted into the inlet of the liquid nitrogen storage container No. 4 so that one end reaches near the bottom, and the other end is placed at the entrance of the liquid nitrogen storage container No. 4, and connected to the thermoelectromotive force detector No. 2 with a conductor. It is connected.
以上のように構成された液体窒素液量計についてその動
作を以下に説−明する。液体窒素が熱電対１の底面に近
い方の端部より液面が上にある時は、熱電対の両端で室
温と液体窒素温度の温度差による熱起電力を発生し、熱
起電力検出計２によって検出される。ところが、液体窒
素が少なくなり液体窒素液面が熱電対の底面に近い方の
端部より下がると、熱電対の両端間で温度差がなくなり
、熱起電力は減少する。従って熱起電力検出計により、
液体窒素の量を検出することができ′る。The operation of the liquid nitrogen liquid meter constructed as described above will be explained below. When the liquid nitrogen level is higher than the end near the bottom of thermocouple 1, a thermoelectromotive force is generated at both ends of the thermocouple due to the temperature difference between the room temperature and the liquid nitrogen temperature, and a thermoelectromotive force detector is detected. Detected by 2. However, when the amount of liquid nitrogen decreases and the liquid nitrogen level drops below the end of the thermocouple near the bottom, the temperature difference disappears between both ends of the thermocouple, and the thermoelectromotive force decreases. Therefore, using a thermoelectromotive force detector,
The amount of liquid nitrogen can be detected.
発明が解決しようとする問題点 ′しかしながら
、上記のような構成においては温度を検出することによ
り、液体窒素液量を検出する方法であるので、熱電対の
一端より液面が上にあるか下にあるかのどちらかを検出
するだけであり、連続的な液量の変化を検出できないと
いう問題点を有していた。Problems to be Solved by the Invention ``However, in the above configuration, the amount of liquid nitrogen is detected by detecting the temperature, so whether the liquid level is above or below one end of the thermocouple, However, it has the problem that continuous changes in liquid volume cannot be detected.
本発明は上記問題点に鑑み、液体窒素の液量の連続的な
変化を検出することのできる液体窒素液量計を提供する
ものである。In view of the above-mentioned problems, the present invention provides a liquid nitrogen liquid meter that can detect continuous changes in the amount of liquid nitrogen.
問題点を解決するための手段
上記問題点を解決するために本発明の液体窒素液量計は
、Ｙ−Ｂａ−Ｃｕ−０系超伝導体線と定電圧電源と電流
計と電気抵抗とを備え、前記超伝導体線と前記定電圧電
源と前記電気抵抗とが直列に接続されているという構成
を備えたものである。Means for Solving the Problems In order to solve the above problems, the liquid nitrogen liquid meter of the present invention uses a Y-Ba-Cu-0 based superconductor wire, a constant voltage power supply, an ammeter, and an electric resistance. The superconductor wire, the constant voltage power supply, and the electric resistance are connected in series.
作用 、
本発明は上記した構成によって、Ｙ−Ｂａ−Ｃｕ−０系
超伝導体線を液体窒素中に浸し、液体窒素液量変化によ
る超伝導体線の抵抗変化を超伝導体線を流れる電流の変
化として検出する方法であるので、液体窒素液量の連続
的変化を検出することができる。Effect: With the above configuration, the present invention immerses a Y-Ba-Cu-0 based superconductor wire in liquid nitrogen, and calculates the resistance change of the superconductor wire due to the change in the amount of liquid nitrogen by measuring the current flowing through the superconductor wire. Since this method detects changes in the amount of liquid nitrogen, it is possible to detect continuous changes in the amount of liquid nitrogen.
実施例
以下本発明の一実施例の液体窒素液量計について、図面
を参照しながら説明する。EXAMPLE Hereinafter, a liquid nitrogen liquid meter according to an example of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例における液体窒素液量計の構
成図を示すものである。第１図において、５はＹ−Ｂａ
−Ｃｕ−０系超伝導体線、６は定電圧電源、７は電流計
、８は電気抵抗、３は液体窒素、４は液体窒素保存容器
である。Ｕ字型に曲げられた超伝導体線５が液体窒素保
存容器４に鉛直につり下げられ、液体窒素中に浸されて
いる。FIG. 1 shows a configuration diagram of a liquid nitrogen liquid meter according to an embodiment of the present invention. In Figure 1, 5 is Y-Ba
-Cu-0 based superconductor wire, 6 is a constant voltage power supply, 7 is an ammeter, 8 is an electric resistance, 3 is liquid nitrogen, and 4 is a liquid nitrogen storage container. A superconductor wire 5 bent into a U-shape is vertically suspended in a liquid nitrogen storage container 4 and immersed in the liquid nitrogen.
一方、この超伝導体線５に定電圧電源６、電流計７、電
気抵抗日が直列に接続されている。On the other hand, a constant voltage power source 6, an ammeter 7, and an electric resistance are connected in series to this superconductor wire 5.
以上のように構成された液体窒素液量計について、以下
その動作を説明する。超伝導体線全体が液体窒素に浸か
っている時、Ｙ−Ｂａ−Ｃｕ−０系超伝導体線では超伝
導状態が実現されるので抵抗値が零となる。従って電流
計７は定電圧電源６の電源電圧と電気抵抗８により決ま
る電流値を示す。液体窒素の液量が減少し超伝導体線の
一部が液体窒素に浸からなくなるとこの部分では超伝導
状態が破れ、有限の抵抗値を持つ。従って電流計７を流
れる電流はこの抵抗値による分だけ減少する。また、こ
の超伝導体線の持つ抵抗値は、液体窒素に浸かっていな
い部分の長さに比例して大きくなるので、液体窒素液面
の変化に連続して超伝導体線の抵抗値が変化することに
なる。この結果、電流計７を流れる電流値は液体窒素液
量の減少とともに連続的に減少する。そこで電流計の目
盛を液体窒素液量の値で較正しておけば液体窒素液量の
値を直読することができる。The operation of the liquid nitrogen liquid meter configured as described above will be described below. When the entire superconductor wire is immersed in liquid nitrogen, the Y-Ba-Cu-0 superconductor wire achieves a superconducting state, so the resistance value becomes zero. Therefore, the ammeter 7 indicates a current value determined by the power supply voltage of the constant voltage power supply 6 and the electric resistance 8. When the amount of liquid nitrogen decreases and a part of the superconductor wire is no longer immersed in liquid nitrogen, the superconducting state is broken in this part and the wire has a finite resistance value. Therefore, the current flowing through the ammeter 7 is reduced by this resistance value. In addition, the resistance value of this superconductor wire increases in proportion to the length of the part not immersed in liquid nitrogen, so the resistance value of the superconductor wire changes continuously with changes in the liquid nitrogen liquid level. I will do it. As a result, the value of the current flowing through the ammeter 7 continuously decreases as the amount of liquid nitrogen decreases. Therefore, if the scale of the ammeter is calibrated with the value of the amount of liquid nitrogen, the value of the amount of liquid nitrogen can be directly read.
以上のように本実施例によれば、Ｙ−Ｂａ−Ｃｕ−０系
超伝導体線と定電圧電源と電流計と電気抵抗を直列に接
続し、超伝導体線を液体窒素中に浸けることにより、液
体窒素液量を連続的に直読することができる。As described above, according to this embodiment, a Y-Ba-Cu-0 based superconductor wire, a constant voltage power source, an ammeter, and an electric resistance are connected in series, and the superconductor wire is immersed in liquid nitrogen. This makes it possible to continuously and directly read the amount of liquid nitrogen.
発明の効果
以上のように本発明はＹ−Ｂａ−Ｃｕ−０系超伝導体線
と定電圧電源と電流計と電気抵抗を直列に接続すること
により、液体窒素液量を連続的に知ることができ、例え
ばエネルギー分散型エックス線微小分析器のエックス線
検出器冷却用液体窒素液量検出計として用いれば、液体
窒素量を的確に知ることができ、液体窒素欠乏による事
故を防ぐのに大いに役立つものである。Effects of the Invention As described above, the present invention is capable of continuously determining the amount of liquid nitrogen by connecting a Y-Ba-Cu-0 superconductor wire, a constant voltage power source, an ammeter, and an electric resistance in series. For example, if it is used as a liquid nitrogen liquid amount detector for cooling the X-ray detector of an energy dispersive X-ray microanalyzer, the amount of liquid nitrogen can be accurately determined, which is very useful in preventing accidents due to liquid nitrogen deficiency. It is.
第１図は本発明の一実施例における液体窒素液量計の構
成図、第２図は従来の液体窒素液量計の構成図である。
１・・・・・・ＩＣ熱電対、２・・・・・・熱起電力検
出計、３・・・・・・液体窒素、４・・・・・・液体窒
素保存容器、５・・・・・・Ｙ−Ｂａ−Ｃｕ−０系超伝
導体線、６・・・・・・定電圧電源、７・・・・・・電
流計、８・旧・・電気抵抗。
代理人の氏名 弁理士 中尾敏男 はが１名／−ＩＣ８
電対
第１図
、ｊ ４ ５
第２図FIG. 1 is a block diagram of a liquid nitrogen liquid meter according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional liquid nitrogen liquid meter. 1...IC thermocouple, 2...thermoelectromotive force detector, 3...liquid nitrogen, 4...liquid nitrogen storage container, 5... ... Y-Ba-Cu-0 system superconductor wire, 6 ... Constant voltage power supply, 7 ... Ammeter, 8. Old ... Electric resistance. Name of agent: Patent attorney Toshio Nakao, 1 person/-IC8
Electrocouple Figure 1, j 4 5 Figure 2
Claims (1)
と電気抵抗とを備え、前記Ｙ−Ｂａ−Ｃｕ−Ｏ系超伝導
体線と前記定電圧電源と前記電流計と前記電気抵抗とが
直列に接続されていることを特徴とする液体窒素液量計
。The Y-Ba-Cu-O based superconductor wire, the constant voltage power source, the ammeter and the electrical resistance are provided. A liquid nitrogen liquid meter characterized by being connected in series with an electric resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29651287A JPH01138423A (en) | 1987-11-25 | 1987-11-25 | Liquid volume meter for liquid nitrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29651287A JPH01138423A (en) | 1987-11-25 | 1987-11-25 | Liquid volume meter for liquid nitrogen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01138423A true JPH01138423A (en) | 1989-05-31 |
Family
ID=17834501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29651287A Pending JPH01138423A (en) | 1987-11-25 | 1987-11-25 | Liquid volume meter for liquid nitrogen |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01138423A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5114907A (en) * | 1991-03-15 | 1992-05-19 | Illinois Superconductor Corporation | Cryogenic fluid level sensor |
| US5593949A (en) * | 1993-07-06 | 1997-01-14 | Lockheed Martin Corporation | High temperature conductor probes for determining liquid level of cryogens |
| US7841235B2 (en) * | 2005-03-05 | 2010-11-30 | Technische Universität Dresden | Superconductive level indicator for liquid hydrogen and liquid neon, and measuring method for liquid level measurement |
| WO2012020506A1 (en) * | 2010-08-13 | 2012-02-16 | 日本協能電子株式会社 | Liquid holding container provided with sensor, and liquid quantity measuring system |
-
1987
- 1987-11-25 JP JP29651287A patent/JPH01138423A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5114907A (en) * | 1991-03-15 | 1992-05-19 | Illinois Superconductor Corporation | Cryogenic fluid level sensor |
| US5593949A (en) * | 1993-07-06 | 1997-01-14 | Lockheed Martin Corporation | High temperature conductor probes for determining liquid level of cryogens |
| US7841235B2 (en) * | 2005-03-05 | 2010-11-30 | Technische Universität Dresden | Superconductive level indicator for liquid hydrogen and liquid neon, and measuring method for liquid level measurement |
| WO2012020506A1 (en) * | 2010-08-13 | 2012-02-16 | 日本協能電子株式会社 | Liquid holding container provided with sensor, and liquid quantity measuring system |
| JP5696148B2 (en) * | 2010-08-13 | 2015-04-08 | 日本協能電子株式会社 | Liquid holding container with sensor |
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