JP2650574B2 - Magnetic field mass spectrometer - Google Patents
Magnetic field mass spectrometerInfo
- Publication number
- JP2650574B2 JP2650574B2 JP4207275A JP20727592A JP2650574B2 JP 2650574 B2 JP2650574 B2 JP 2650574B2 JP 4207275 A JP4207275 A JP 4207275A JP 20727592 A JP20727592 A JP 20727592A JP 2650574 B2 JP2650574 B2 JP 2650574B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- coil
- mass spectrometer
- mass
- canceling
- 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.)
- Expired - Fee Related
Links
Landscapes
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Electron Tubes For Measurement (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は磁場型質量分析装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field type mass spectrometer.
【０００２】[0002]
【従来の技術】イオンビームは磁場の作用で曲げられる
ので、磁場の変動の激しい所で磁場型質量分析計を用い
ると、外部磁場の影響で、分解能が低下し、また精密な
質量測定ができない。変動する外部磁場の原因としては
商用電源の配線とかトランス，モータ等もあるが、実際
上影響が大きいのは、１０Ｈｚ程度のより低周波の磁場
変動であり、その原因としては屋外を通っている電車等
がある。2. Description of the Related Art Since an ion beam is bent by the action of a magnetic field, if a magnetic field type mass spectrometer is used in a place where the magnetic field fluctuates greatly, the resolution is reduced due to the influence of an external magnetic field, and precise mass measurement cannot be performed. . Causes of the fluctuating external magnetic field include commercial power supply wiring, transformers, and motors, but the effect is actually large due to lower-frequency magnetic field fluctuation of about 10 Hz, which is caused by passing outdoors. There are trains.
【０００３】上述したような外部磁場の変動に対する対
策を考えるに当たっては、二つの点が問題になる。イオ
ン軌道上で外部磁場を打ち消すためのコイルを設置する
ことが考えられるが、コイルとして巻線を数１０回巻い
た単環コイルを用いることは簡単ではあるが次のような
問題がある。 In considering measures against the above-described fluctuation of the external magnetic field , there are two problems. It is conceivable to install a coil for canceling an external magnetic field in the y o <br/> down orbit, wound winding number 10 times as a coil
Although it is easy to use a single ring coil,
There's a problem.
【０００４】[0004]
【発明が解決しようとする課題】外部磁場を打ち消すた
めの磁場発生コイルとして単環式のコイルを用いた場合
次のような問題がある。単環式コイルが作る磁場はコイ
ル軸上でもコイルからの距離による磁場強度の変化率が
大きく、コイル軸と直交する面内での磁場強度の変化率
も大きいため、イオンビームの軌道上で外部磁場を打ち
消す場合、その作用がコイルの位置に対して著しく敏感
で、わずかな振動にも影響されて取扱いが不便である。
従って本発明は外部磁場の変動を打ち消すためのコイル
の作用をより安定なものとすることを一つの目的とす
る。When a monocyclic coil is used as a magnetic field generating coil for canceling an external magnetic field, the following problem occurs. The magnetic field created by a monocyclic coil has a large rate of change in magnetic field strength depending on the distance from the coil even on the coil axis, and a large rate of change in magnetic field strength in a plane perpendicular to the coil axis. When canceling a magnetic field, its action is extremely sensitive to the position of the coil, and is inconvenient to handle due to slight vibration.
Therefore, an object of the present invention is to make the action of a coil for canceling the fluctuation of the external magnetic field more stable.
【０００５】[0005]
また、もう一つの問題は外部攪乱磁場をどAnother problem is the external disturbance magnetic field.
のようにして検出するかと云うことである。商用交流磁That is, it is detected as follows. Commercial AC magnet
場だけが対象であれば、交流電源から信号をとって適当If only the field is the target, take the signal from the AC power supply and
に位相を調節して補償コイルに入力すればよく、磁場検The phase can be adjusted and input to the compensation coil.
出の問題はない。本発明の場合、装置自体が強い磁場をThere is no problem of exit. In the case of the present invention, the device itself generates a strong magnetic field.
発生しているので、磁場検出手段がその磁場を検出するSince it has been generated, the magnetic field detecting means detects that magnetic field
と却って補償作用が不安定になるおそれがあり、さらにOn the contrary, the compensation may be unstable,
補償コイルが発生する磁場を検出すると補償動作が発信When the magnetic field generated by the compensation coil is detected, a compensation operation is issued.
状態になる危険がある。したがって補償動作が安定してThere is a risk of getting into a state. Therefore, the compensation operation is stable
行われるような磁場検出手段を考えることが本発明の他It is another aspect of the present invention to consider a magnetic field detecting means as performed.
の課題である。It is an issue of.
【０００６】[0006]
【課題を解決するための手段】外部磁場を打ち消すため
の磁場発生用コイルをヘルムホルツ型コイルとした。ま
た、磁場検出手段を質量分散用磁場および上記コイルが
作る磁場の影響が届かない程度に質量分析装置から離れ
た場所に磁場検出手段を配置した。 A coil for generating a magnetic field for canceling an external magnetic field is a Helmholtz type coil. Ma
Further, the magnetic field detecting means includes a magnetic field for mass dispersion and the coil.
Move away from the mass spectrometer so that the influence of the magnetic field does not reach
The magnetic field detecting means was placed at the place where the magnetic field was detected.
【０００７】[0007]
【作用】ヘルムホルツ型コイルは図１に示すように二つ
の同じ環状コイルを同軸上においてコイル半径だけ離し
て置き、両コイルに同じ向きに同じ電流を流すようにし
たものである。このようなコイルでは上下のコイルの間
のコイル軸上で上下方向に殆ど磁場強度が変わらず、磁
場強度Ｂは Ｂ＝４Ｎμｉ／５√５ｒ で与えられる。こゝでｒはコイルの半径、ｉはコイル電
流で、Ｎは各単環の巻数である。このヘルムホルツ型コ
イルでは軸線上の磁場強度の変化が小さいが、このこと
は軸線近辺では磁力線が軸線に対して平衡で曲がりが小
さいことを意味し、このことは軸線と直角の方向にも磁
場の変化が少ないことを意味して、上下のコイルの中間
位置ではどの場所でも殆ど同じ強度の平行磁場が形成さ
れていることになる。このためコイルの位置敏感性がな
くなり、安定した外部磁場の打ち消しが可能となる。ま
た、本発明で補償しようとしている磁場は商用交流磁場
とか遠い所に発生原因がある低周波の磁場で一つの室内
では一様とみなせる磁場であるから、磁場検出手段を質
量分析装置からある程度離しておけば、安定した補償動
作が得られることになる。 In the Helmholtz type coil, as shown in FIG. 1, two identical annular coils are coaxially separated by a coil radius and the same current flows in the same direction in both coils. In such a coil, the magnetic field intensity hardly changes in the vertical direction on the coil axis between the upper and lower coils, and the magnetic field intensity B is given by B = 4Nμi / 5√5r. Here, r is the radius of the coil, i is the coil current, and N is the number of turns of each single ring. In this Helmholtz type coil, the change in the magnetic field strength on the axis is small, which means that the magnetic force lines are balanced with respect to the axis near the axis and the bend is small, which means that the magnetic field also changes in the direction perpendicular to the axis. This means that there is little change, so that a parallel magnetic field of almost the same intensity is formed at any position in the middle position between the upper and lower coils. For this reason, the position sensitivity of the coil is eliminated and stable cancellation of the external magnetic field becomes possible. Ma
The magnetic field to be compensated in the present invention is a commercial AC magnetic field.
One room with a low-frequency magnetic field that has a cause in a distant place
Since the magnetic field can be considered uniform, the magnetic field
A certain amount of distance from the mass spectrometer
You will get a crop.
【０００８】[0008]
【実施例】図２に本発明の一実施例を示す。Ｍは質量分
析計の本体部で、Ｃが外部磁場打ち消し装置の制御部で
ある。質量分析計で、１はイオン源，２は質量分散用磁
場、３はイオン検出器で、４が本発明に係る外部磁場打
ち消し用のコイルで前述したようにヘルムホルツ型コイ
ルが用いられている。５は分析管で、非磁性のステンレ
スで作られており、イオンビームはこの中を通る。質量
分散用磁場は水平面内、図では紙面と垂直な水平面内で
質量分散を行う。外部磁場打ち消し用コイル４は鉛直
軸、図で上下方向を軸方向とし、上下単環で分析管５を
はさむようにして、質量分散用磁場の入口側に設置され
ている。FIG. 2 shows an embodiment of the present invention. M is a main unit of the mass spectrometer, and C is a control unit of the external magnetic field canceling device. In the mass spectrometer, 1 is an ion source, 2 is a magnetic field for mass dispersion, 3 is an ion detector, 4 is a coil for canceling an external magnetic field according to the present invention, and a Helmholtz coil is used as described above. Reference numeral 5 denotes an analysis tube, which is made of non-magnetic stainless steel, and through which the ion beam passes. The magnetic field for mass dispersion performs mass dispersion in a horizontal plane, in the figure, in a horizontal plane perpendicular to the paper surface. The external magnetic field canceling coil 4 is installed on the entrance side of the magnetic field for mass dispersion in such a manner that the analysis tube 5 is sandwiched between the vertical axis and the vertical direction in the figure, and the analysis tube 5 is sandwiched by a single vertical ring.
【０００９】外部磁場打ち消し装置の制御部Ｃと外部磁
場打ち消し用コイル４とはケーブル６でつながれて、外
部磁場打ち消し装置の制御部Ｃは室内の適当な場所に置
かれる。同制御部内で、７は磁気センサ、８はプリアン
プ、９は調節用可変抵抗で、１０はパワアンプであり、
パワアンプの出力電流が外部磁場打ち消し用コイル４に
供給される。The control unit C of the external magnetic field canceling device and the coil 4 for canceling the external magnetic field are connected by a cable 6, and the control unit C of the external magnetic field canceling device is placed at an appropriate place in the room. In the control unit, 7 is a magnetic sensor, 8 is a preamplifier, 9 is a variable resistor for adjustment, 10 is a power amplifier,
The output current of the power amplifier is supplied to the external magnetic field canceling coil 4.
【００１０】上述した外部磁場打ち消し装置の用法は次
の通りである。まずＣを質量分析計Ｍの質量分散用磁場
の影響を受けず、室内のトランス等の電気装置から離れ
た適当な場所に置く。１０Ｈｚ前後の磁場変動の原因は
前述したように屋外で相当離れた所にあるから、変動磁
場は室内では均一とみてよく、制御部Ｃは質量分析計の
本体部Ｍから５ｍ位離れていても、外部磁場の変動は充
分に打ち消すことができる。装置Ｃの位置を決めたら、
適当な質量のイオンを質量分析計Ｍに導入し、その質量
のイオンを検出するように質量分析計の磁場を設定して
イオン検出出力を記録する。外部磁場が変動するので、
この記録は外部磁場の変動に応じて変化する。そこで調
節用抵抗９を調節してイオン検出出力の変動がなくなる
ようにする。装置Ｃの設置位置を代えたり、磁気センサ
の向きを変えると、調節用抵抗９の調節つまみの位置も
変えねばならないが、装置Ｃの位置や磁気センサの向き
はイオン検出出力が最も良く安定するよう最適の場所と
向きを探すようにするのが良い。一度このような設定を
行えば、後は殆ど制御部Ｃの場所を変える必要はない。
質量分析計で打ち消すべき外部変動磁場は、質量分散面
に垂直な方向の磁場成分であるが、この成分はその場所
の磁場強度と比例しているので磁気センサ７は磁場検出
の方向を外部磁場打ち消し用コイル４の軸と平行にする
必要はない。The usage of the above-mentioned external magnetic field canceling device is as follows. First, C is placed in an appropriate place away from electric devices such as a transformer in a room without being affected by the magnetic field for mass dispersion of the mass spectrometer M. As described above, the cause of the magnetic field fluctuation around 10 Hz is at a considerably distant place outdoors, so the fluctuating magnetic field may be considered to be uniform indoors, and even if the control unit C is about 5 m away from the main unit M of the mass spectrometer. In addition, the fluctuation of the external magnetic field can be sufficiently canceled. After deciding the position of device C,
An ion having an appropriate mass is introduced into the mass spectrometer M, and a magnetic field of the mass spectrometer is set so as to detect the ion having the mass, and an ion detection output is recorded. Since the external magnetic field fluctuates,
This recording changes according to the fluctuation of the external magnetic field. Therefore, the adjustment resistor 9 is adjusted so that the fluctuation of the ion detection output is eliminated. When the installation position of the device C is changed or the direction of the magnetic sensor is changed, the position of the adjustment knob of the adjusting resistor 9 must be changed. However, the ion detection output is best stabilized for the position of the device C and the direction of the magnetic sensor. Try to find the best location and orientation. Once such settings are made, there is almost no need to change the location of the control unit C thereafter.
The externally fluctuating magnetic field to be canceled by the mass spectrometer is a magnetic field component in a direction perpendicular to the plane of mass dispersion. Since this component is proportional to the magnetic field strength at that location, the magnetic sensor 7 sets the direction of the magnetic field detection to the external magnetic field. It is not necessary to be parallel to the axis of the canceling coil 4.
【００１１】[0011]
【発明の効果】本発明によれば、外部磁場打ち消し用コ
イルにヘルムホルツ型コイルを用いたので、位置敏感性
がなくなり、外部磁場検出手段を質量分析装置から離し
て設置したので、外部磁場打ち消し作用が安定したもの
となって、磁気的環境の悪い所でも高分解能，高精度の
質量分析が可能となる。According to the present invention, since the Helmholtz type coil is used as the coil for canceling the external magnetic field, the position sensitivity is lost, and the external magnetic field detecting means is separated from the mass spectrometer.
The external magnetic field canceling action becomes stable, and high-resolution, high-precision mass spectrometry can be performed even in a place with a poor magnetic environment.
【図１】ヘルムホルツ型コイルの斜視図FIG. 1 is a perspective view of a Helmholtz coil.
【図２】本発明の一実施例のブロック図FIG. 2 is a block diagram of one embodiment of the present invention.
Ｍ 質量分析計本体 Ｃ 外部磁場打ち消し装置の制御部 １ イオン源 ２ 質量分散用磁場 ３ イオン検出器 ４ 外部磁場打ち消し用コイル ５ 分析管 ６ ケーブル ７ 磁気センサ ９ 調節用可変抵抗 M Mass spectrometer main body C Control unit of external magnetic field canceling device 1 Ion source 2 Magnetic field for mass dispersion 3 Ion detector 4 External magnetic field canceling coil 5 Analysis tube 6 Cable 7 Magnetic sensor 9 Adjustable variable resistance
Claims (1)
の両方にイオンビームの通路をはさむようにかつコイル
の軸が質量分析装置の質量分散面に垂直となるようにヘ
ルムホルツ型コイルを配置し、質量分散用磁場および上
記ヘルムホルツ型コイルの作る磁場の影響が届かない程
度に質量分析装置から離れた場所に磁場センサを配置し
て、同磁場センサの出力により上記コイルの電流を制御
して、上記コイルの中心線上で外部磁場を打ち消すよう
にしたことを特徴とする磁場型質量分析装置。An ion beam is inserted between an entrance and / or an exit of a magnetic field for mass dispersion and a coil.
The Helmholtz-type coil is arranged so that the axis is perpendicular to the mass dispersion plane of the mass spectrometer, and the magnetic field for mass dispersion and
The influence of the magnetic field created by the Helmholtz type coil is too small to reach
Each time a magnetic field sensor is arranged at a place away from the mass spectrometer, the current of the coil is controlled by the output of the magnetic field sensor, and an external magnetic field is canceled on the center line of the coil. Magnetic field mass spectrometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4207275A JP2650574B2 (en) | 1992-07-10 | 1992-07-10 | Magnetic field mass spectrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4207275A JP2650574B2 (en) | 1992-07-10 | 1992-07-10 | Magnetic field mass spectrometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0636741A JPH0636741A (en) | 1994-02-10 |
| JP2650574B2 true JP2650574B2 (en) | 1997-09-03 |
Family
ID=16537102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4207275A Expired - Fee Related JP2650574B2 (en) | 1992-07-10 | 1992-07-10 | Magnetic field mass spectrometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2650574B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2304834B1 (en) * | 2006-01-04 | 2010-01-08 | Felix Salazar Bloise | HOMOGENEUM MAGNETIC FIELD GENERATOR DEVICE. |
| US8362423B1 (en) * | 2011-09-20 | 2013-01-29 | The University Of Sussex | Ion trap |
| KR20230079499A (en) | 2016-08-05 | 2023-06-07 | 추가이 세이야쿠 가부시키가이샤 | Composition for prophylaxis or treatment of il-8 related diseases |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7206464A (en) * | 1971-09-15 | 1973-03-19 | ||
| JPS52136578A (en) * | 1976-05-12 | 1977-11-15 | Toshiba Corp | Electron beam exposure apparatus |
| JPS56107684A (en) * | 1980-01-31 | 1981-08-26 | Toshiba Corp | Interfering magnetic field refusing device of television receiving set |
| JPH01239755A (en) * | 1988-03-18 | 1989-09-25 | Toshiba Corp | Neutral particle energy analyzing device |
-
1992
- 1992-07-10 JP JP4207275A patent/JP2650574B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0636741A (en) | 1994-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |