Control system and method of mass spectrum device

Abstract

The invention discloses a control system of a mass spectrum device. The control system comprises a sample injection system, a vacuum system, an acquisition and analysis system and control software, the sample injection system comprises a sample introduction cavity and a main body cavity, and a sample target is arranged at the position of the sample injection cavity; the vacuum system comprises three electromagnetic valves, a molecular pump and a mechanical pump, a forestage valve is arranged between the mechanical pump and the molecular pump, a deflation valve is arranged on the sample injection cavity, and a pre-pumping valve is arranged in the main cavity; the acquisition and analysis system comprises an ion source and a detector, the ion source ionizes a sample on the sample target, and the sample flies to the detector for detection through scattering of the ion source; and the control software comprises a control panel in the mass spectrometer, a computer and a display. According to the vacuum system, the pressure intensity in a vacuum area can reach 3*10<-4> Pa or below, a sample and a matrix are effectively ionized under the irradiation of emitted high-pulse laser, the flight time of ions can be accurately measured, the detection limit reaches 1 fmol / ul, the precision of a mass internal standard method is 150 ppm, and the precision of an external standard method is 200 ppm.

Description

technical field [0001] The invention relates to the technical field of mass spectrometry devices, in particular to a control system and method for mass spectrometry devices. Background technique [0002] The time-of-flight mass analyzer can analyze the mass of charged ions with a certain flight speed generated by the ion source. The time-of-flight mass analyzer is a field-free flight tube. When the ion source ionizes the sample into charged ions, the ions with different mass-to-charge ratios enter the flight tube at different speeds by accelerating the electric field. The larger the mass-to-charge ratio, the lower the speed. Ions with different flight speeds fly in the flight tube with the same length, so the time to reach the detector is also different. Ions with a small mass-to-charge ratio arrive first, and ions with a large mass-to-charge ratio arrive later, thereby completing mass analysis. However, the current time-of-flight mass analyzer will have low measurement acc...

AI Technical Summary

Problems solved by technology

For this reason, an object of the present invention is to propose a control system and method for a mass spectrometer, which solves the problems of low vacuum in the ion flight environment and low flight time accuracy

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