From the experiment of a Non-Thermal Dielectric Barrier Discharge Generator using a DC power supply, it was found that adjusting the gas flow rate caused the plasma to grow longer. Increasing and reducing the gas flow rate was no more or less effective in the discharge voltage and current because of the plasma discharged around the end of the acrylic tube. When the gas flow rate was inert, there was a breakdown in further distances and the length of plasma was longer. The change of the gas flow rate. As a result, voltage discharge and current discharge much less. Because the plasma causes discharge at the electrodes. When gas flows is very to make gas the breakdown on the point far more. Result in dose plasma is longer.
Adjusting the gap distances from the ring electrode to the end of acrylic tubes of 5 different sizes resulted in a wider size of with a darker color in the plasma while the length of the plasma was shorter in the same current. When increasing the DC voltage, the length of the plasma was a little longer. It can be said that increasing the gas flow rate helps the distance of the plasma jet longer. The more plasma generation and the more watts can be made by increasing the distances from the ring electrode to the end of the acrylic tube. Increasing the voltage from the DC power supply can make it grow longer and more efficient. The change of the gap distance. As a result, the currents discharge will occur at between the electrode cause a white light in that area. When the change of the gap distance increased. Result in dose plasma is shorter