Study On Detection Method And Characteristics Of Output Charge Of Plasma Source At Atmospheric Pressure

The detection of the output charge of the atmospheric plasma source is of great significance for the study of corona discharge ion wind and ion source.In addition,the electrostatic discharge caused by the gas-filled dust carrying charges that can cause serious damage to weapons and equipment,precision electronic devices,and the like.In order to prevent the damage caused by electrostatic discharge of gas,it is usually necessary to control the charge density in the ambient gas of the relevant place below the safe value.It is particularly important to use a certain method to measure the amount of charge in the ambient gas or even monitor it in real time.In this paper,a method for detecting the charge carried by flowing gas is established.The method collects the charge of the flowing gas by introducing a closed pipeline and a self-made charge collector,and detects the collected charge by using a high-precision measuring circuit to calculate the gas.The number of charges carried.At the same time,the method is used to measure the charge number density in the corona discharge ion wind under different conditions.The research results are as follows:1.A detection method for the carrying charge of flowing gas is established.The detection range of this method is 0?10.7 nC,and the measurement error is 0.24%.Th e method is based on the flow characteristics of the output charge of the atmospheric pressure plasma source and the superposition characteristics of the electric field,as we 11 as the specificity of the gas charge detection and detection equipment and the partic ularity of the detection process.The measurement factors affecting the method are exp lored to maximize the measurement effect.good.The results show that the method ca n accurately detect the charge density of gas ions in the pipeline,and provides an acc urate and reliable method for carrying the charge of the flowing gas.2.Using the flowing gas carrying charge detection method to study the variation law of charge in corona discharge ion wind in pipeline.The charge density correspon ding to positive and negative corona is studied for the excitation voltage,the gas flow rate in the pipeline and the type of gas source.When holding other conditions,and t he corresponding charge density is increased with the increase of the excitation voltag e;under positive and negative corona.When the other conditions are kept the same,a nd the corresponding charge density is measured with the gas flow rate.The increase and decrease;under positive and negative corona.When keeping other conditions the same,the type of gas source that generates ion wind by corona discharge is changed,and the corresponding charge density is the largest,followed by nitrogen,oxygen,and air.3.A negative ion generating device was established based on the single-electrode corona discharge characteristics,and the negative charge number generated in the negative ion source was detected by gas charge detection method.In the case of a certain excitation voltage and total gas flow rate.The proportion of oxygen added with nitrogen or argon increases,and the corresponding negative charge density increases.The ozone concentration decreases;the total gas flow rate remains the same,oxygen and When the ratio of nitrogen or argon is constant,and as the excitation voltage increases,the corresponding negative charge density increases,and the corresponding ozone concentration increases.Under the same conditions,the negative charge density of ionized oxygen mixed with nitrogen or argon is more than the negative charge density measured by ionizing a single oxygen.The corresponding ozone concentration measured is lower than the ozone concentration measured when ionizing a single oxygen.