Guide rod radio frequency power supply, tuning method and mass spectrometer

Abstract

The invention discloses a guide rod radio frequency power supply, a tuning method and a mass spectrometer; the guide rod radio frequency power supply comprises the following units: a host computer used for scanning frequency and locking resonance frequency points, and issuing radio frequency frequencies and an amplitude control order; a control and signal processing unit controlled by the host computer so as to form a radio frequency signal with the frequency and amplitude controlled by the control order; a power amplification unit used for amplifying the radiofrequency power of the radiofrequency signal; a boost and auxiliary tuning unit used for boosting the radiofrequency signal amplified by the power amplification unit and carrying out capacitance auxiliary tuning, thus outputting a radio frequency voltage so as to drive the guide rod. The guide rod radio frequency power supply is small in size, low in cost, wide in a tuning scope, easy in tuning, and can drive guide rods (like a level-6 rod or a level-8 rod) of different specifications; frequency modulation tuning and capacitance auxiliary tuning are combined so as to realize fast tuning.

Description

technical field [0001] The invention relates to the technical field of mass spectrometry, in particular to a radio frequency power supply for a guide rod used in a mass spectrometer, a tuning method and a mass spectrometer. Background technique [0002] A mass spectrometer generally consists of a sampling hole, a colander, an ion guide, and an ion lens. Among them, the ion guiding device is a component for transporting ions. The ion guiding device is not only used to transport ions, but also can reduce the spatial divergence and energy divergence of ions to reduce the loss of ions during transmission. With the development and improvement of ion optics theory, a variety of ion guide devices with different shapes and principles have emerged. Among them, the multi-stage rod is a kind of ion guide device that is relatively mature at present. The multi-stage rod is the general name of the guide rods such as the quadrupole rod, the hexapole rod and the octopole rod. , organic a...

AI Technical Summary

Problems solved by technology

As a quadrupole ion guide for quality selection, the quadrupole and the RF power supply that drives it usually appear in one piece, and the adjustable capacitor can be fine-tuned during tuning. However, this RF power supply is expensive

However, in the hexapole or octopole ion guide device, the hexapole or octopole is mostly designed and processed by itself, and the volume and size are different, and the difference in equivalent capacitance value is also very large.

If the RF power supply driving the quadrupole is used to drive the hexapole or octopole, in addition to the high cost, the tuning range of the RF power driving the quadrupole cannot cover most guide rods

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