Self-tuning all-solid-state microwave source MPT, self-tuning device and control method

Abstract

The invention provides a self-tuning all-solid-state microwave source MPT, a self-tuning device and a control method. A microwave plasma torch (4) comprises a coupled antenna (5) and a regulating part (6). The self-tuning device comprises a microwave source, a control module (2) and a transmission device (3). The microwave source is connected with the coupled antenna (5). The regulating part (6) is connected with the transmission device (3). The transmission device (3) is connected with the control module (2). The control module (2) is connected with the microwave source. The microwave source generates a microwave electromagnetic field to provide microwave energy for the microwave plasma torch (4) and acquires feedback information of the microwave plasma torch (4) from the coupled antenna (5) at the same time; the microwave source extracts a reflection power value from the feedback information and feeds back the reflection power value to the control module (2); the control module sends a control signal to the transmission device (3) according to the reflection power value and a preset parameter relation curve, and the transmission device (3) drives the regulating part (6) to move.

Description

technical field [0001] The invention relates to the technical field of chemical measurement, in particular to a self-tunable all-solid-state microwave source MPT, a self-tuning device and a control method. Background technique [0002] The microwave plasma torch (MPT) was invented by Professor Jin Qinhan in 1985, and the corresponding patent application number is CN 94205428.8. At present, the microwave plasma torch (MPT) has been commercially used in sequential scanning spectrometers, full-spectrum direct-reading spectrometers, etc. However, during the use of these MPT spectrometers, once the parameters of the system change, it is necessary to adjust the reflective end face of the torch. For example, the change of working gas, the change of analyte composition and concentration, the change of flow rate, the change of power, etc., or the system impedance cannot match, all make the reflected power of MPT in the working state in a non-optimal state, and the energy cannot be o...

AI Technical Summary

Problems solved by technology

For example, the change of working gas, the change of analyte composition and concentration, the change of flow rate, the change of power, etc., or the system impedance cannot match, all make the reflected power of MPT in the working state in a non-optimal state, and the energy cannot be obtained. Effective utilization, so it is necessary to adjust the position of the reflective end face of the torch tube in order to make it work in an optimal state

[0003] The traditional MPT torch is realized by manual adjustment, which belongs to open-loop control, and has the following disadvantages: (1) It requires the experience of the operator; (2) The MPT spectrometer is frequently switched on and off to adjust the torch, which is cumbersome to operate and is not conducive to instrument protection; (3) The instrument is not closed during manual adjustment, which may easily cause microwave leakage; (4) In some non-optimal working conditions, the self-heating of the MPT torch brings inconvenience to the operator

Images