Design Of Amplitude Modulation Pulsed Power Supply And Data Acquisition System For Electrostatic Probe

Plasma as the fourth state of matter has many special properties. At present, with the wide application of plasma technology in the chemical industry, environmental protection, medical and energy field, for the characteristics of plasma parameters in high precision requirements more stringent. There are many diagnostic methods of the plasma parameters, electrostatic probe method as one of the oldest and most simple, the most convenient method is one of the most extensive application of the diagnosis of plasma parameters. Electrostatic probe the traditional system is composed of discrete components to build and probe measurement of voltage and current manual, so that not only the low efficiency and poor accuracy, and the anti-interference ability is not strong. In the electrostatic probe method, due to the single probe work in the electron saturation flow, probe serious fever, self resistance increase, will seriously affect the accuracy of the determination of the plasma parameters, therefore, the design of an efficient, accurate, strong anti-interference ability and can effectively reduce the electron saturation flow caused by heating of the problem is the automatic diagnosis system necessary, used to improve the precision and efficiency of diagnosis.This paper introduces a kind of electrostatic probe and its data acquisition device based on amplitude modulation pulse scanning power supply. Among them, scanning power supply composed of a microprocessor and an operational, can signal pulse generation+5V adjustable amplitude, and the use of high power operational amplifier3583AM voltage pulse signal amplification to+50V, the voltage on the electrostatic probe as a loading on scanning power supply probe; data acquisition module card is connected with PC by using USB2085H data acquisition it can be used for collecting, electrostatic probe on the voltage and current and real time display on the host computer interface. Add a variety of anti-jamming measures on hardware, improve the system of anti-interference ability. In the software aspect, in addition to the basic procedures, also using the digital filter certain.This system has been successfully verified by experiment, the volt ampere curve smoothing the measured, get reasonable parameters, that the design of this device is more successful, compared with the traditional device, the measurement system is more and more convenient, high precision, high integration, strong anti-jamming capability, and the connection between the device and PC with convenient disassembly, more for the subsequent processing of the data analysis using the powerful PC.