Mass spectrometer radio frequency power supply provided with temperature compensation system

Abstract

The invention discloses a mass spectrometer radio frequency power supply provided with a temperature compensation system. The mass spectrometer radio frequency power supply comprises a radio frequencyvoltage V closed-loop circuit, a direct current amplifying module and a scanning signal, wherein the radio frequency voltage V closed-loop circuit sequentially comprises a comparator, a mixer, a power amplifier and an amplitude detection module, the scanning signal and the output terminal of the amplitude detection module are respectively electrically connected with the input terminal of the comparator, the output terminal of the amplitude detection module is electrically connected with the input terminal of the direct current amplifying module by virtue of one multiplier, a temperature compensation amplifying circuit with positive and negative temperature compensation coefficients is also arranged in the radio frequency power supply, the temperature compensation amplifying circuit also comprises a temperature compensation module provided with a temperature-sensitive element, the temperature-sensitive element is used for detecting ambient temperature T at which the radio frequency power supply works, a data model stored with relation between the ambient temperature T and a deviation value of the radio frequency power supply is also arranged in the temperature compensation module,and the temperature compensation module dynamically adjusts the feedback quantity of the radio frequency power supply according to the working ambient temperature and the data model. The mass spectrometer radio frequency power supply disclosed by the invention adopts the temperature compensation module based on the temperature-sensitive element, actively solves the temperature drift problem, is high in compensation efficiency and well maintains voltage stability of the radio frequency power supply.

Description

technical field [0001] The invention relates to the technical field of analytical instruments, in particular to a mass spectrometer radio frequency power supply with a temperature compensation system. Background technique [0002] The RF power supply is a circuit module used to drive the mass analyzer in the mass spectrometer, and its temperature stability directly determines the accuracy of the analysis results of the mass spectrometer. In order to overcome the temperature drift problem of the RF power supply, the existing measures mainly include: (1) The overall constant temperature provides a constant temperature working environment for the entire RF power supply. This method greatly increases the weight, volume, and power consumption of the system, and increases the system complexity. It is not suitable for miniaturized instruments; (2) Optimizing components, using discrete components with extremely low temperature drift and modular components with high stability, this m...

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Problems solved by technology

It should be noted that when the RF operating temperature changes in the opposite direction, the change trend of the mass axis and the scanning line is the same as Figure 4 On the contrary, it will also affect the detection accuracy of the mass spectrometer

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