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Plasma sheath for car Cleaning Machine

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Published on:

02 Nov,2020

Plasma sheath for car Cleaning Machine:

 

Plasma, when in contact with to the wall, the electrode in the interface can form a thin layer of electrically neutral be destroyed, the deviation of neutral thin layer known as the plasma sheath, also known as the plasma car washer plasma sheath layer, sheath layer formation is closely related to the plasma shielding effect, plasma is disturbed, the space charge generated by the debye shielding layer.

 

The plasma sheath can be formed on the surface of the electrode or the wall of the plasma. According to the relationship between the electrode or the wall potential and the plasma potential, the plasma sheath can be divided into ion sheath and electron sheath. The sheath near the electrode of the plasma car cleaning machine: plasma potential is set as Vp and electrode potential as Vs. When the difference between electrode potential Vs and plasma potential Vp is all reached, the external circuit will be connected, and the electrode will have current flowing, which is equivalent to introducing an external electric potential to act on the plasma. When VsNe). With the enhancement of the electric field, a space charge layer composed of ions will be formed within a certain distance from the electrode, namely, the ion sheath. When Vs>Vp, the electric field formed near the electrode will attract electrons and repel ions, and the result is that the electron density is higher than the ion density (Ne>Ni). With the increase of the electric field intensity, a space charge layer composed of electrons, namely the electron sheath, will be formed within a certain distance from the electrode.

 

The sheath at the floating substrate: when the plasma is inserted into the PLASMA of the PLASMA washer, the charged particles that reach the surface of the insulator either compound with each other at the surface or return to the plasma area because the current cannot pass through. In plasma, as the motion velocity of electrons is greater than that of heavy particles, there will be net negative charge accumulation on the surface of the insulator, that is, the surface is negative potential relative to the plasma area. The negative potential of the surface area repels subsequent electrons moving towards the surface and attracts the positive ions until the negative potential of the surface of the insulator reaches a certain value, equating the current of the ion with the current of the electron. At this time, the surface potential Vf of the insulator tends to be stable, and the difference between Vf and plasma potential (VP-VF) remains constant. There is a space charge layer near the surface of the insulator, and this space charge layer is the ion sheath. Since the insulator in plasma is often referred to as a floating substrate, the potential of the insulator is often called a floating potential. It is obvious that the floating potential is a negative value, and the junction between the floating substrate and the plasma forms a space charge layer composed of positive ions. So any insulator, including the reactor wall, placed in a plasma will form an ionic sheath.

 

Plasma sheath is one of the important characteristics of plasma body weight. The specific performance of plasma sheath in plasma car cleaning machine is closely related to system temperature T and particle density N. Some important properties of plasma can be understood by studying sheath.

Plasma sheath for car Cleaning Machine

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