Small-sized magnetic deflection mass spectrometer
A magnetic deflection mass spectrometer, a small technology, is used in material analysis, measuring devices, instruments and other directions by electromagnetic means, which can solve the problems of difficult and accurate determination, small changes in instrument sensitivity and resolution, and heavy weight, and achieves easy production. , reduce quality discrimination, reduce the effect of quality and power consumption
Active Publication Date: 2012-11-28
NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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Problems solved by technology
The common disadvantages of existing magnetic deflection mass spectrometers are high power consumption, large volume, and heavy mass, so they are not suitable for portable gas composition detection and space environment detection
[0003] For a magnetic deflection mass spectrometer, when the magnetic scanning method is used, the sensitivity and resolving power of the instrument change little when the accelerating voltage is constant; however, it needs to use a DC electromagnet and a high-stability excitation power supply, and the ion mass It has a square relationship with the magnetic field strength, so it is difficult to measure accurately
However, the electronic scanning method only needs to use a permanent magnet, and the ion mass and the accelerating voltage have a linear relationship, which is convenient for accurate measurement; however, there is a mass discrimination effect caused by the change of the accelerating voltage, that is, the ion mass is inversely proportional to the accelerating voltage. When the mass is high, the sensitivity and resolving power of the instrument decrease with the decrease of the accelerating voltage
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[0011] Preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0012] figure 1 It is a small magnetic deflection mass spectrometer realized according to the present invention. It consists of an ion source 1, an ion source vacuum chamber 2, a magnetic analyzer 3, a flight pipeline 4, a receiver 5, and a receiver vacuum chamber 6. The ion source 1 is placed in the ion In the source vacuum chamber 2, the inlet end of the flight pipeline 4 is connected to the ion source vacuum chamber 2, and the flight pipeline 4 is provided with two outlets, which are respectively connected to two receiver vacuum chambers 5, and the magnetic analyzer 3 is set outside the flight pipeline 4. The receiver 5 is arranged in a receiver vacuum chamber 6 .
[0013] The ion source of the mass spectrometer adopts a small Neil-type ion source, which is mainly composed of an ionization box, a filament and an ion optical system.
[0014] The ma...
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The invention relates to a small-sized magnetic deflection mass spectrometer, which comprises an ion source, an ion source vacuum chamber, a magnetic analyzer, a drift tube, receivers and receiver vacuum chambers, wherein the ion source is arranged in the ion source vacuum chamber; the inlet end of the drift tube is connected with the ion source vacuum chamber; the drift tube is provided with twooutlet ends and connected with two receiver vacuum chambers respectively; the magnetic analyzer is sleeved outside the drift tube; and the receivers are arranged in the receiver vacuum chambers. Because the double-channel 90-degree fan-shaped magnetic analyzer is adopted, the mass and power consumption of the mass spectrometer are greatly reduced, a control circuit is convenient to manufacture, and mass discrimination caused by large amplitude change of an accelerating voltage is reduced.
Description
technical field [0001] The invention relates to a small magnetic deflection mass spectrometer, which belongs to the technical field of instruments and meters. Background technique [0002] A magnetic deflection mass spectrometer is mainly composed of an ion source, a magnetic analyzer, an ion receiver and an electrical measurement system. The common disadvantages of existing magnetic deflection mass spectrometers are high power consumption, large volume, and heavy mass, so they are not suitable for portable gas composition detection and space environment detection. [0003] For a magnetic deflection mass spectrometer, when the magnetic scanning method is used, the sensitivity and resolving power of the instrument change little when the accelerating voltage is constant; however, it needs to use a DC electromagnet and a high-stability excitation power supply, and the ion mass It has a square relationship with the magnetic field strength and is difficult to measure accurately....
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IPC IPC(8): G01N27/64
Inventor 李得天郭美如肖玉华赵以德王亮岳瑞郭文瑾
Owner NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH