Introduction to the emission spectrum of the plate electrode under normal pressure nanosecond pulse of plasma cleaning machine:
At present, there are two methods to obtain large-scale unbalanced plasma under normal pressure conditions. Nanosecond pulse discharge, as a more effective method to control the discharge relaxation time, has been widely used in the production of low-temperature unbalanced plasma. middle. Therefore, what is the plasma emission spectrum under normal pressure nanosecond pulse conditions? Chengfeng Zhi-made plasma cleaning machine introduces you.

Using high-voltage nanosecond pulse voltage to replace the traditional sinusoidal AC power supply to drive the DBD can make the DBD generate uniform and unbalanced plasma within a larger electrode gap, gas composition, voltage frequency and other parameter variations. The following is a high-voltage bipolar nanosecond pulse drive plate-plate electrode structure DBD plasma using a plasma cleaner with adjustable pulse width. The plasma produces electrode gaps of 2mm and 4.5mm under atmospheric pressure, respectively.
The bipolar pulse of the plasma cleaner can be driven to generate a uniform discharge plasma under a small electrode gap, and under a large electrode gap, a short pulse width is conducive to achieving uniform discharge under atmospheric pressure. When the pulse width is 20ns, a uniform discharge can be generated in a larger electrode gap, but as the pulse width increases, the uniform discharge gradually decreases. When the voltage pulse width is 200 ns, there are obvious filament discharge channels in the discharge gap, and the gas breakdown mode changes to the streamer discharge mode.
Under the same experimental conditions, the DBD bipolar pulse emission spectrum of the plate-plate electrode structure is similar to that of the needle-plate electrode structure discharge, but in the uniform discharge mode, since the electron energy in the plasma is less than that of the streamer discharge plasma, it is directly ionized In addition, the ground state nitrogen molecules are excited to form fewer excited state nitrogen molecules, and the negative band of the nitrogen molecular ion 1 is weaker, so the excited state nitrogen molecules form fewer excited state nitrogen molecules. This is the plasma emission spectrum of the plate-plate electrode structure in exponential coordinates.
Due to the use of exponential coordinates, weak signals in the spectrum will be amplified and displayed, which is conducive to observing the 1 negative band of nitrogen molecules. However, this waveband is still difficult to identify. Therefore, from the point of view of electron energy, the atmospheric nanosecond pulse DBD obtained under current conditions is uniform.
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