Digital measurement and control system of portable ion trap frequency modulation mass spectrometer

Abstract

The invention relates to a digital measurement and control system of a portable ion trap frequency modulation mass spectrometer. The digital measurement and control system comprises a host computer, a D / A digital-to-analog converter, a filter plate, an ion source, a high-speed high-voltage amplification module, an ion trap and a charge detector; digital control signals outputted by the host computer are converted into analog control signals by the D / A digital-to-analog converter, and then the analog control signals are transmitted to the filter plate; the analog control signals are filtered by the filter plate, and filtered analog control signals are transmitted to the ion source and the high-speed high-voltage amplification module; the high-speed high-voltage amplification module amplifies received analog control signals and transmits amplified analog control signals to the ion trap; the ion source is arranged just above the ion trap; the charge detector is arranged just below the ion trap; the charge detector transmits detected particle information to the D / A digital-to-analog converter; and the D / A digital-to-analog converter processes the particle information and then transmits processed particle information to the host computer. The digital measurement and control system of the invention has the advantages of small size, compact structure, integration of a mass spectrometer and a measurement and control system, and portability.

Description

technical field [0001] The invention relates to a digital measurement and control system, in particular to a digital measurement and control system of a portable ion trap frequency modulation mass spectrometer. Background technique [0002] Nano- and micro-scale particles, such as dust, aerosols, cells, viruses, micromaterials, etc., play a role that cannot be ignored in human production and life. They play an important role in air pollution, medicine, health, materials and other fields. The micron-sized PM2.5 sweeping across the country has received widespread attention due to its serious threat to national health. Since the scale of particles has an important impact on the properties of particles such as optics, electricity, and thermodynamics, analytical chemists are eager to know the parameters such as particle size, mass, and density. From a practical point of view, the analysis of aerosols in environmental testing and the analysis of microorganisms in biomedicine req...

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Problems solved by technology

However, the pneumatically assisted ion source needs to strictly control the opening timing and duration of the catheter valve, and it does not cooperate well with the scanning frequency change of the ion trap.

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