Time-of-flight mass spectrometer detection chamber

A technology of time-of-flight mass spectrometry and detection chamber, which is applied in the field of analysis and detection of volatile organic compounds. It can solve the problems of speed direction, size inconsistency, location, restriction of detector sensitivity and resolution, and low resolution, so as to increase the distance of ion movement. , Improving the ion utilization rate and the effect of high-resolution detection

Pending Publication Date: 2021-01-08
肖洋
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  • Application Information

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Problems solved by technology

At present, PTR-MS, which has been developed more, often has low resolution, which is mainly caused by the inconsistency of the velocity direction and size (velocity dispersion) and different positions (space disp

Method used

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  • Time-of-flight mass spectrometer detection chamber
  • Time-of-flight mass spectrometer detection chamber

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Embodiment

[0040] A detection chamber of a time-of-flight mass spectrometer, comprising an accelerating electric field region 3 at the upper part, a field-free drift region 8 at the middle and a reflection region 14 at the lower part, the accelerating electric field region 3 communicates with the reflection region 14 through the field-free drift region 8, There are four pole plates inside the accelerating electric field area 3, and the four plates are bottom plate 4, extraction plate 5, middle plate 6 and accelerating electrode plate 7 from top to bottom, and XY is set in the field-free drift area 8 Three sets of reflectors 13 and detectors 15 are arranged in the deflection plate 9 and the reflection area 14 .

[0041] An inlet hole 1 is arranged on the wall of one side of the accelerating electric field area, and a Faraday cup 2 is arranged near the inlet hole 1 .

[0042] The voltage of the bottom plate 4 is -100V~-200V, and a pulse voltage is applied to the extraction plate 5. When th...

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Abstract

The invention belongs to the field of volatile organic compound analysis and detection, and particularly relates to a time-of-flight mass spectrometer detection chamber. The detection chamber comprises an acceleration electric field area located at the upper part, a field-free drift area located at the middle part and a reflection area located at the lower part, the acceleration electric field region is communicated with the reflection area through the field-free drift region, four polar plates are arranged in the acceleration electric field area, and the four polar plates are a bottom plate,an extraction polar plate, a middle polar plate and an acceleration electrode plate in sequence from top to bottom; and an XY deflection plate is arranged in the field-free drift region, and three groups of reflectors and detectors are arranged in the reflection region. According to the invention, the instrument resolution and the sensitivity of the detector can be improved, the influence of strayions on ion flight is reduced, and the ion utilization rate is high.

Description

technical field [0001] The invention belongs to the field of analysis and detection of volatile organic compounds, in particular to a time-of-flight mass spectrometer detection room. Background technique [0002] With the promulgation of the national "Ten Air Measures", the determination of volatile organic compounds in the air and exhaust gas has become the key content of atmospheric monitoring. In order to obtain real-time emissions of VOCs from enterprises or the content of VOCs in the ambient air of emergencies, it is possible to quickly measure VOCs in the air. Proton transfer reaction mass spectrometry (PTR-MS) has been widely used. At present, PTR-MS, which has been developed more, often has low resolution, which is mainly caused by the inconsistency of the velocity direction and size (velocity dispersion) and different positions (space dispersion) of the ion flow when it enters the detector. When entering the detection chamber, there are velocity dispersion and spac...

Claims

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Application Information

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IPC IPC(8): H01J49/40H01J49/02H01J49/10
CPCH01J49/025H01J49/10H01J49/405
Inventor 王新娟肖洋王琛阚丽萍
Owner 肖洋
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