Characterization of Atmospheric Pressure Plasmas by a Gerdien Condenser

Abstract

A compact Gerdien condenser is being developed as a new characterization tool for laboratory-produced atmospheric pressure plasma. The Gerdien condenser is capable of determining the ion density and mobility, thus ion species composition of the plasma. The device has a 1.0 cm diameter, 6.0 cm long cylindrical current collector electrode mounted on a bias electrode of 1.7 cm inner diameter. The flow rate of the fan attached at the end of the condenser is set from 1.9 to 7.5 × 10 2 cm 3 s −1. Some of the values of ion mobility calculated from the I − V characteristics obtained for atmospheric plasmas produced by RF excited atmospheric pressure plasma pen are in the range of O + , O − , O 2 − , O 2 + , Ar + , N + and N 2 +. The total positive ion densities at 2.0 cm away from the plasma pen are determined to be in the range of 10 6 cm −3 .

Indoor air purification by dielectric barrier discharge combined with ionic wind: physical and microbiological investigations

“…By varying the deflection voltage and the flow velocity, it is also possible to determine the ion mobility and thus, ion species composition of the air, which was done e.g. by Lacdan and Wada [27] to perform diagnostics on a plasma source. However, the mentioned parameters were fixed for the used ionometer here [28].…”

Low Electric Field Drift Tube Ion Mobility Analysis for Atmospheric Pressure Plasma

“…1. Charged species are generated using a 13.56 MHz RF powered capacitively coupled atmospheric pressure plasma jet source [17]. The plasma source operates at an input power of 40 W with the minimum reflected power down to 1.8 W. Argon gas was introduced into the plasma source at a flow rate of 5 liters per minute.…”

Effect of Electrode Material to Current-Voltage Characteristics of a Gerdien Condenser

“…The total ion densities are calculated using the same method as Ref. [6]. Parallel to I sat behavior in Sec.…”

“…The Gerdien condenser technique has been widely used in atmospheric science to identify the ion mobility, density and electric conductivity from the troposphere to mesosphere region [1][2][3][4][5]. Besides its traditional usage, the technique can also give information on atmospheric pressure plasma, and we have reported results of a miniaturized Gerdien condenser for laboratory-produced atmospheric pressure plasmas [6]. The miniaturized condenser was capable of determining ion mobility with the density of atmospheric pressure plasmas from the obtained current-voltage (I-V) characteristics.…”