Design and Construction of 2.45GHz Microwave Plasma Source at Atmospheric Pressure

Converting a Microwave Oven into a Plasma Reactor: A Review

“…A similar cavity magnetron capacitor controlled drive circuit is reported in [23]. Chaichumporn et al have also reported further refinement of the magnetron anode voltage (3.3 to 6.6 kV) in [40]. e transformer comprises two winding circuits: e first provides a winding ratio to produce 240 V at 50-60 Hz to approximately 3.5 V at 50-60 Hz for the cathode heater, and the second provides the step-up voltage (240 V at 50-60 Hz to 2-3 kV at 50-60 Hz).…”

“…Whether this or electromagnetic power loss is responsible for the effect, further work is required. In addition, this work has reconstructed a preformed disc aerial electrode (igniter) suitable for a narrow tube reactor [16,40] (Figure 4). e safety match flame, lighted cigarette, sliced grape, and metal antenna electrode have been observed to have a catalyst role in the production of plasma and plasmoids.…”

“…e description of construction and use of wire aerial electrodes for plasma ignition is now used as an aid to outline the construction of the plasma igniter [16] and the drawing in [40] (Figure 4). Assuming that the drawing in [40] may be scaled, the plasma igniter may be constructed in two ways: Firstly, the igniter may be constructed using two wire electrodes opposing each other and bent at 45°so that their tips are aligned with the gas flow, and the fixing location is formed using an insulating ring.…”

“…Assuming that the drawing in [40] may be scaled, the plasma igniter may be constructed in two ways: Firstly, the igniter may be constructed using two wire electrodes opposing each other and bent at 45°so that their tips are aligned with the gas flow, and the fixing location is formed using an insulating ring. e second and more practical arrangement is that the igniter is preformed from a 30 mm diameter × 0.5 mm thick steel steel disc, and a plurality of electrodes are punched from the central portion of the disc and bent to a 45°angle.…”

“…Hence, given the heat capacity of water is 4.184 J/(g·K), the calculated applied power (P) within the cavity may be obtained by placing a known mass of water (m) within the cavity and heating it for a short period of time (t), making sure the water does not boil. With the knowledge of the measured water temperature change (ΔT � final temperature -initial temperature), the microwave power entering into the cavity is calibrated for a given power setting using the following equation (see also [40]):…”