A measurement system and method for dielectric barrier discharge characteristics under airflow control

Abstract

A measurement system and method for dielectric barrier discharge characteristics under airflow control, including a DBD generating device; the DBD generating device includes a connected DBD flat plate electrode unit and a current measurement unit; the DBD flat plate electrode unit includes an upper electrode and an insulating medium; the insulating medium Including the first quartz glass and the second quartz glass, the first quartz glass covers the surface of the upper electrode, and the center of the second quartz glass is coated with ITO coating; the airflow control system is used to regulate the airflow velocity on the surface of the high voltage electrode; the power supply system is connected to the optical measurement system . The invention can precisely control the airflow velocity, achieve full coverage of the airflow on the electrode, realize the adjustable airflow velocity, air gap, voltage, frequency and other parameters, and record the discharge current and surface image at any time in any cycle , the measurement resolution is high, and it is helpful to carry out in-depth mechanism research on the transformation law of the dielectric barrier discharge form from the perspective of discharge characteristics and surface discharge images.

Description

technical field [0001] The invention belongs to the field of dielectric barrier discharge, and relates to a measurement system and method for dielectric barrier discharge characteristics under airflow control. Background technique [0002] In industrial applications, dielectric barrier discharge (DBD) is the most common type of discharge. This form of discharge needs to cover the electrode surface with a barrier medium, and it is easy to generate low-temperature non-equilibrium plasma at atmospheric pressure. In addition, barrier discharge can generate a large number of active particles, such as thermal electrons, free radicals, and photons in the visible and ultraviolet ranges, with low power consumption. In view of the above reasons, DBD has irreplaceable advantages in the surface modification of heat-sensitive materials, biology and medicine, and has also been widely used in the fields of ozone synthesis, plasma combustion and lighting. The realization of atmospheric pr...

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Problems solved by technology

At the same time, it can also weaken the discharge intensity, causing the discharge to go out

[0004] In the current measurement method, it is difficult to ensure the parallelism of the electrodes, which affects the precise control of the airflow, it is difficult to ensure the consistency of the airflow direction, it is easy to form a vortex inside the electrode or it is impossible to achieve full coverage of the electrode

The measurement of the discharge image is mainly concentrated on the side, and the dynamic measurement of the surface morphology is difficult to achieve high-resolution dynamic measurement

At present, the ICCD widely used in image capture can only take a single image at a time, and it is difficult to observe the discharge form changes at different moments in a single cycle

The research on the influence of airflow on dielectric barrier discharge is mainly driven by low-frequency AC and DC voltage power supplies. There is still a lack of systematic measurement methods for the influence of airflow on dielectric barrier discharge under high-frequency AC voltage.

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