JPH0740484B2 - Magnetic field scanning mass spectrometer - Google Patents
Magnetic field scanning mass spectrometerInfo
- Publication number
- JPH0740484B2 JPH0740484B2 JP58246809A JP24680983A JPH0740484B2 JP H0740484 B2 JPH0740484 B2 JP H0740484B2 JP 58246809 A JP58246809 A JP 58246809A JP 24680983 A JP24680983 A JP 24680983A JP H0740484 B2 JPH0740484 B2 JP H0740484B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- magnetic
- auxiliary coil
- mass spectrometer
- magnetic pole
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/022—Circuit arrangements, e.g. for generating deviation currents or voltages ; Components associated with high voltage supply
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Electron Tubes For Measurement (AREA)
Description
【発明の詳細な説明】 イ 産業上の利用分野 本発明は磁場の強さを変化させることによつてコレクタ
ースリツトを通過するイオンの質量を走査する磁場走査
型質量分析計に関するものである。The present invention relates to a magnetic field scanning mass spectrometer that scans the mass of ions passing through a collector slit by changing the strength of a magnetic field.
ロ 従来技術 磁場走査型質量分析計においては、磁場の強さの時間的
な変化率に比例した渦電流が磁極内に誘起されるので、
走査速度が速くなると磁極の中央部における磁場が渦電
流による磁束によつて弱められるという問題がある。こ
のため走査速度によつて磁場分布が変化し、磁場の一様
性が悪くなつて所定の分解能が得られなくなるという欠
点があり、また質量スペクトルの測定を行うために磁場
強度を検出して質量目盛信号（マスマーカー信号）を得
ているがこの磁場検出器（ホール素子など）は磁極の周
辺部に設置されるので、走査速度を上げて行くと実際に
質量分析を行つている領域の磁場強度よりも検出される
磁場強度の方が強くなつて質量目盛か実際よりも大きく
なつてしまうという欠点があつた。(B) Prior art In a magnetic field scanning mass spectrometer, an eddy current proportional to the temporal change rate of the magnetic field strength is induced in the magnetic pole, so
There is a problem that the magnetic field in the central portion of the magnetic pole is weakened by the magnetic flux due to the eddy current when the scanning speed becomes faster. Therefore, there is a drawback that the magnetic field distribution changes depending on the scanning speed, the uniformity of the magnetic field deteriorates, and the prescribed resolution cannot be obtained, and the magnetic field strength is detected to measure the mass spectrum to measure the mass spectrum. Although a scale signal (mass marker signal) is obtained, this magnetic field detector (Hall element, etc.) is installed in the periphery of the magnetic pole, so when the scanning speed is increased, the magnetic field in the area where mass analysis is actually performed is performed. There is a drawback in that the detected magnetic field strength becomes stronger than the strength, and the mass scale becomes larger than it actually is.
ハ 目的 本発明は上記の欠点を解消するために、磁場を走査した
ときにも一定磁場のときと同様に磁極間の磁場分布が一
様であるようにすることを目的とするものである。(C) Object In order to solve the above-mentioned drawbacks, it is an object of the present invention to make the magnetic field distribution between magnetic poles uniform when scanning a magnetic field as in the case of a constant magnetic field.
ニ 構成 上記の目的を達成するために、本発明は電磁石の磁極縁
辺に補助コイルを設けて、この補助コイルに渦電流とは
反対方向に磁場強度の変化率に比例した電流を供給する
ことにより、渦電流による磁束を打ち消すようにしたも
のである。In order to achieve the above object, the present invention provides an auxiliary coil on the magnetic pole edge of the electromagnet, and supplies the auxiliary coil with a current proportional to the rate of change of the magnetic field strength in the direction opposite to the eddy current. The magnetic flux due to the eddy current is canceled.
ホ 実施例 図面は本発明の一実施例を示したものである。第１図に
おいて１は分析管で２は試料イオン化室である。分析管
１内の試料イオンは電磁石の磁極３によつて方向を曲げ
られたのちコレクタースリツト４を通つてイオン検出器
５に入る。６は補助コイルで両磁極面間に磁極縁辺に沿
つて配設され、できるだけ薄くするために銅板を絶縁フ
イルムで狭んだ面状導体を用いている。この補助コイル
６は電流可変の定電流源７に接続されている。第２図は
第１図のＡ−Ａ断面における磁場の分布を示したもの
で、実線は補助コイルなしで磁場を走査した場合に磁極
内の渦電流によつて磁極中央部の磁場が弱められている
状態を示している。また点線は一定磁場の場合あるいは
補助コイルによつて補正された状態を示している。第３
図は補助コイルに磁場の強さの変化率に比例した電流を
供給するための回路構成を示したもので、磁場発生用電
磁石の励磁コイル８の両端子間電圧を電圧計９で検出
し、その検出信号によつて直流電流電源７を制御して、
励磁コイル８の両端子間電圧に比例した電流を補助コイ
ル６に供給する。励磁コイルの両端間電圧を検出する代
りに磁場を検出して、その微分信号で補助コイルに流す
電流を制御してもよい。[Embodiment] The drawings show an embodiment of the present invention. In FIG. 1, 1 is an analysis tube and 2 is a sample ionization chamber. The sample ions in the analysis tube 1 are bent by the magnetic poles 3 of the electromagnet and then pass through the collector slit 4 to enter the ion detector 5. Reference numeral 6 denotes an auxiliary coil which is arranged between both magnetic pole surfaces along the magnetic pole edge and uses a planar conductor in which a copper plate is narrowed by an insulating film in order to make it as thin as possible. This auxiliary coil 6 is connected to a constant current source 7 whose current is variable. FIG. 2 shows the distribution of the magnetic field in the AA cross section of FIG. 1, and the solid line shows that the magnetic field at the center of the magnetic pole is weakened by the eddy current in the magnetic pole when the magnetic field is scanned without the auxiliary coil. It shows the state. The dotted line shows the case of a constant magnetic field or the state corrected by the auxiliary coil. Third
The figure shows the circuit configuration for supplying a current proportional to the rate of change of the magnetic field strength to the auxiliary coil. The voltage between both terminals of the exciting coil 8 of the magnetic field generating electromagnet is detected by the voltmeter 9. The direct current power supply 7 is controlled by the detection signal,
A current proportional to the voltage between both terminals of the exciting coil 8 is supplied to the auxiliary coil 6. Instead of detecting the voltage across the exciting coil, the magnetic field may be detected and the differential signal thereof may be used to control the current flowing through the auxiliary coil.
ヘ 効果 本発明は上記のように磁極縁辺に補助コイルを設けて磁
場の変化率に比例した電流を流すようにしたもので、渦
電流は磁極縁辺に集中する傾向があるから、補助コイル
が、この渦電流に近接して配置されることにより、補助
コイルの発生する磁場によつて渦電流による磁場は相殺
され、磁場走査時における磁場分布を一様均一な分布に
近づけることができ、したがつて磁場検出器が磁極周辺
部に配置されていても磁場の走査速度の差異によつて質
量目盛信号に狂いを生じるおそれがなく、また走査速度
が速くなつてもゆつくり走査する場合と同程度の分解能
を得ることができるという利点がある。F Effect In the present invention, the auxiliary coil is provided on the magnetic pole edge as described above so that the current proportional to the rate of change of the magnetic field is flown, and since the eddy current tends to concentrate on the magnetic pole edge, the auxiliary coil is By being arranged close to this eddy current, the magnetic field generated by the eddy current is canceled by the magnetic field generated by the auxiliary coil, and the magnetic field distribution during magnetic field scanning can be made close to a uniform distribution. Even if a magnetic field detector is placed in the periphery of the magnetic pole, there is no risk of deviation in the mass scale signal due to the difference in the magnetic field scanning speed. The advantage is that the resolution of can be obtained.
第１図は本発明の一実施例を示す要部概略平面図、第２
図は同上の動作説明図、第３図は同上のブロツク回路図
である。 １…分析管、２…イオン化質、３…磁極、４…コレクタ
ースリツト、５…イオン検出器、６…補助コイル、７…
定電流電源、８…励磁コイル、９…電圧計。FIG. 1 is a schematic plan view of an essential part showing an embodiment of the present invention.
FIG. 3 is an operation explanatory diagram of the above, and FIG. 3 is a block circuit diagram of the above. 1 ... Analysis tube, 2 ... Ionized material, 3 ... Magnetic pole, 4 ... Collector slit, 5 ... Ion detector, 6 ... Auxiliary coil, 7 ...
Constant current power source, 8 ... Excitation coil, 9 ... Voltmeter.
Claims (1)
ち、磁場内に導入してイオンの方向を曲げ、コレクター
スリツトを通してイオン検出器で検出するようにし、上
記磁場の強さを経時的に変化させることによりコレクタ
ースリツトに入射するイオンの質量を走査するようにし
た構成において、上記磁場を形成する電磁石の磁極縁辺
に補助コイルを設けて、該補助コイルに上記磁場の強さ
の変化率に比例した電流を供給することにより、磁極内
の渦電流による磁束を相殺せしめたことを特徴とする磁
場走査型質量分析計。1. A sample is ionized and accelerated by an electric field, then introduced into a magnetic field to bend the direction of the ions, and the ions are detected by an ion detector through a collector slit. In the configuration in which the mass of the ions incident on the collector slit is scanned by changing the auxiliary magnetic field, an auxiliary coil is provided at the magnetic pole edge of the electromagnet that forms the magnetic field, and the auxiliary coil has a rate of change in the magnetic field strength. A magnetic field scanning mass spectrometer characterized in that a magnetic flux due to an eddy current in a magnetic pole is canceled by supplying a current proportional to
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58246809A JPH0740484B2 (en) | 1983-12-23 | 1983-12-23 | Magnetic field scanning mass spectrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58246809A JPH0740484B2 (en) | 1983-12-23 | 1983-12-23 | Magnetic field scanning mass spectrometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60136148A JPS60136148A (en) | 1985-07-19 |
| JPH0740484B2 true JPH0740484B2 (en) | 1995-05-01 |
Family
ID=17154000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58246809A Expired - Lifetime JPH0740484B2 (en) | 1983-12-23 | 1983-12-23 | Magnetic field scanning mass spectrometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0740484B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0782933B2 (en) * | 1989-01-19 | 1995-09-06 | 新技術事業団 | Superconducting magnet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58190754A (en) * | 1982-04-30 | 1983-11-07 | Shimadzu Corp | Mass number display apparatus of mass spectrometer apparatus |
-
1983
- 1983-12-23 JP JP58246809A patent/JPH0740484B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60136148A (en) | 1985-07-19 |
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