This was a great lecture by Dr. Macheret on Low Temperature Plasma (LTP)s. Professor Macheret makes a good point that about 12% of the electricity used in the US goes to lighting and most of that is plasma based. So this brings out a useful application to study LTPs. Another good point that Dr. Macheret talks about is the use of Plasma for etching processes.
The wind tunnel results of the aircraft wing which is in a stall angle, and how a cold micro-plasma array is used to prevent the aircraft from stalling is an excellent application of contemporary Plasma use. It is amazing that Plasma can be used for food safety and improve food shelf-life. Dr. Macheret talks about Plasma for RF Electronics and how the future of RF Technology requires an "on the fly" fully reconfigurable radars for both military and civilian purposes. This is something I am interested in so I really enjoyed this part of the lecture. It was very interesting to me to hear that you can change the length of an antenna if it is made by plasma.
On Slide 9 Dr. Macheret definitely has a very complicated I-V Curve, Current-Voltage curve, I certainly have not seen one this complicated, but it show the various boundaries that can be potentially tapped for plasma applications. Plasma has unique dielectric properties that it can go to negative values and behave like an inductor instead of a capacitor. He discuses the high voltage presence in the cathode sheath and how to use that. Gas Discharge Tubes (GDT)s which cost about $0.10 per piece were used for his experiment. It is amazing how cheap these GDTs are.
The S2,1 results of the GDT tunable LC Resonator were interesting. It was funny that one of the audience was telling Dr. Macheret to perform spectroscopy where as Dr. Macheret explains his method of open eye spectroscopy. Dr. Macheret talks about field emission and field ionization, and talks about why we need both of them for this application. It is amazing that electrons can travel from the cathode to anode in tens of pico of seconds. I am amazed that it can even be measured that low. He discusses the use of Plasma as Power Limiters. Dr. Macheret discusses the performance stability of these GDTs. I really enjoyed the plasma antennas section of lecture because again it relates to my study here at Purdue University. The current Plasma antennas need to be minimized for patch antenna applications so that is an open area for study as well.
Dr. Macheret speaks about the advantages of using Plasmas vs. Metallic antennas, especially the comparison of electron densities, electrical conductivity, collision frequency, and skin depth. It is interesting how many properties of Plasma can be used for RF Applications. He compares the Dipole Plasma Antenna and the Metallic Antenna, and how the gain in plasma antennas is better.
Lastly, Dr. Macheret discusses the low noise properties of Plasma Antennas. He talks about the use of photo ionization to produce cold Plasma. Basically he concludes by summarizing the whole lecture on cold plasma and its application. Excellent lecture!!! We should have more of this one Nano Hub.
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Shahzad Hameedi @ on
5.0 out of 5 stars
This was a great lecture by Dr. Macheret on Low Temperature Plasma (LTP)s. Professor Macheret makes a good point that about 12% of the electricity used in the US goes to lighting and most of that is plasma based. So this brings out a useful application to study LTPs. Another good point that Dr. Macheret talks about is the use of Plasma for etching processes.
The wind tunnel results of the aircraft wing which is in a stall angle, and how a cold micro-plasma array is used to prevent the aircraft from stalling is an excellent application of contemporary Plasma use. It is amazing that Plasma can be used for food safety and improve food shelf-life. Dr. Macheret talks about Plasma for RF Electronics and how the future of RF Technology requires an "on the fly" fully reconfigurable radars for both military and civilian purposes. This is something I am interested in so I really enjoyed this part of the lecture. It was very interesting to me to hear that you can change the length of an antenna if it is made by plasma.
On Slide 9 Dr. Macheret definitely has a very complicated I-V Curve, Current-Voltage curve, I certainly have not seen one this complicated, but it show the various boundaries that can be potentially tapped for plasma applications. Plasma has unique dielectric properties that it can go to negative values and behave like an inductor instead of a capacitor. He discuses the high voltage presence in the cathode sheath and how to use that. Gas Discharge Tubes (GDT)s which cost about $0.10 per piece were used for his experiment. It is amazing how cheap these GDTs are.
The S2,1 results of the GDT tunable LC Resonator were interesting. It was funny that one of the audience was telling Dr. Macheret to perform spectroscopy where as Dr. Macheret explains his method of open eye spectroscopy. Dr. Macheret talks about field emission and field ionization, and talks about why we need both of them for this application. It is amazing that electrons can travel from the cathode to anode in tens of pico of seconds. I am amazed that it can even be measured that low. He discusses the use of Plasma as Power Limiters. Dr. Macheret discusses the performance stability of these GDTs. I really enjoyed the plasma antennas section of lecture because again it relates to my study here at Purdue University. The current Plasma antennas need to be minimized for patch antenna applications so that is an open area for study as well.
Dr. Macheret speaks about the advantages of using Plasmas vs. Metallic antennas, especially the comparison of electron densities, electrical conductivity, collision frequency, and skin depth. It is interesting how many properties of Plasma can be used for RF Applications. He compares the Dipole Plasma Antenna and the Metallic Antenna, and how the gain in plasma antennas is better.
Lastly, Dr. Macheret discusses the low noise properties of Plasma Antennas. He talks about the use of photo ionization to produce cold Plasma. Basically he concludes by summarizing the whole lecture on cold plasma and its application. Excellent lecture!!! We should have more of this one Nano Hub.
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