temperature control circuit

Abstract

The present invention proposes a temperature control circuit, which is used to control the temperature of the atomization chamber of the mass spectrometer sampling system. The refrigeration chip provides a constant current power supply; the temperature sensor module is used to collect the real-time temperature in the atomization chamber to obtain a temperature sampling signal; the analog-to-digital conversion module is coupled to the temperature sensor module to perform analog-to-digital conversion on the temperature sampling signal; and The control module is coupled between the program-controlled constant current source module and the analog-to-digital conversion module, and is used to control the output of the program-controlled constant-current source module according to the temperature sampling signal converted by the analog-to-digital conversion module. The temperature control circuit proposed by the present invention simultaneously realizes the on-line disconnection detection function of the refrigerating sheet and the temperature sensor, thereby improving the reliability and self-checking ability of temperature control.

Description

technical field [0001] The invention relates to a mass spectrometer, in particular to a temperature control circuit for temperature control of a spray chamber in the mass spectrometer. Background technique [0002] Inductively coupled plasma mass spectrometry (ICP-MS) is an analytical and testing technology developed rapidly in the 1970s. Its principle is to use inductively coupled plasma to ionize the elements contained in the analysis sample into charged ions, and pass through the ion transmission system Charged ions are introduced into the mass analyzer and separated according to different mass-to-charge ratios. After the ion current is amplified by the detector, the measurement and control system processes and gives the analysis results. Compared with other analytical techniques, the described ICP-MS has the advantages of low detection limit, wide linear range, rapid and simultaneous detection of various elements, and the like. With the expansion of the application rang...

AI Technical Summary

Problems solved by technology

[0004] The sampling system generally includes an atomizer and a spray chamber, and the spray chamber needs to be temperature controlled. At present, the existing spray chamber controllers use Peltier effect semiconductor refrigeration chips, and mainly use PWM technology to control the temperature of the spray chamber. The temperature is adjusted, however, the existing control method uses a constant voltage source to supply power to the refrigerating sheet, which lacks overcurrent protection and open circuit detection functions for the refrigerating sheet, and also lacks an open circuit detection function for the temperature sensor

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