Development of a portable cold air plasma jet device and observation of its photo ionization process

Zhaoquan CHEN (陈兆权); Jinfang WU (吴金芳); Huang ZHANG (张煌); Ming ZHANG (张明); Sanyang ZHANG (张三阳); Deren FENG (冯德仁)

doi:10.1088/2058-6272/ab8d1b

Plasma Science and Technology > 2020 > 22(8): 85403-085403. > DOI: 10.1088/2058-6272/ab8d1b

Zhaoquan CHEN (陈兆权), Jinfang WU (吴金芳), Huang ZHANG (张煌), Ming ZHANG (张明), Sanyang ZHANG (张三阳), Deren FENG (冯德仁). Development of a portable cold air plasma jet device and observation of its photo ionization process[J]. Plasma Science and Technology, 2020, 22(8): 85403-085403. DOI: 10.1088/2058-6272/ab8d1b

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Development of a portable cold air plasma jet device and observation of its photo ionization process

Anhui Key Laboratory of Electrical Drive and Power Electronics, Anhui University of Technology, Maanshan 243032, People's Republic of China

Funds: The authors are grateful for financial support from National Natural Science Foundation of China (Nos. 11575003, 51607003)

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Received Date: March 11, 2020
Revised Date: April 24, 2020
Accepted Date: April 25, 2020

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Abstract

Abstract

Photo ionization plays a critical role in the formation and propagation of atmospheric pressure plasma jet plumes. But in experiments, it is very difficult to observe the photo ionization due to its relative lower density of photo electrons. In the present study, we develop a portable cold air plasma jet device and observe the ionization wave in a dc spark air plasma jet. The discharge images acquired by an ICCD camera show that the ionization wave front performs as a quickly moving bright ball. Breakdown could take place at another side of the quartz plate or pork tissue layer (6 mm thick), which suggests that the ionization should be attributed to photo ionization. The laser schlieren images indicate there is propagation of a shock wave along with the plasma bullet. Based on the photo ionization theory and the photo-electric measurement, the direct photo ionization and multistage photo ionization are the main factors in charge of generating the cold air plasma jet. In addition, the plasma jet outside of the cathode nozzle is colder than 320 K and can be touched safely by a human. In view of the plasma jet including a large amount of active particles, such as NO, O, OH, emitted photons, etc, the proposed portable cold air plasma jet device could be qualified for plasma bio-medicine applications.
- photo ionization,
- air plasma jet,
- plasma bullet,
- ionization wave

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References (45)

References

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