Use of thermocouples and argon line broadening for gas temperature measurement in a radio frequency atmospheric microplasma jet

Doyle, Steven J.; Xu, Kunning G.

doi:10.1063/1.4976683

Cited by 21 publications

(8 citation statements)

References 19 publications

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“…The simulated available OES of the diatomic molecule in LIFBASE were used to give assumptions on the gas temperature in the plasma treatment, as shown in Figure C. The estimated rotational plasma temperature (close to the gas temperature) was 350 K (∼77 °C), which avoided the effect of overheating temperature on the plasma degradation .…”

Section: Resultsmentioning

confidence: 99%

Effect of Reactive Chemical Species on the Degradation of Deoxynivalenol, 3-Acetyldeoxynivalenol, and 15-Acetyldeoxynivalenol in Low-Temperature Plasmas

Fang

Zhang

Sun

et al. 2022

ACS Food Sci. Technol.

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Deoxynivalenol (DON) is one of the most prevalent Fusarium mycotoxins in food and feedstuff and causes serious health maladies to human and animals. Developing effective and safe methods for degrading DON and its derivatives, such as 3-acetyldeoxynivalenol (3-AcDON) and 15-acetyldeoxynivalenol (15-AcDON), should be a priority of food safety agencies. In this research, low-temperature plasma treatment, a rapid and environment-friendly method, was shown to be effective in degrading DON, 3-AcDON, and 15-AcDON. The physicochemical characteristics of low-temperature plasma treatment, including the production of singlet oxygen (1O2), oxygen free radicals, NO2 –, NO3 – , and H2O2 concentrations at different times (1, 5, and 10 min) together with the degradation effect were evaluated. Our results showed that DON was effectively degraded by 54.6%; while 3-AcDON and 15-AcDON, which have not been reported to be degraded effectively by other methods, were degraded by 30.3 and 26.6%, respectively. Singlet oxygen had the highest concentration among oxygen free radicals but attenuated after 5 min of treatment. The concentrations of NO2 –, NO3 –, and H2O2 were observed in DON, 3-AcDON, and 15-AcDON solutions with a time-manner increase after plasma treatment, respectively. These reactive species that caused chemical breakdown of DON, 3-AcDON, and 15-AcDON in degradation were evaluated to be less toxic than those without treatment.

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Section: Resultsmentioning

confidence: 99%

Effect of Reactive Chemical Species on the Degradation of Deoxynivalenol, 3-Acetyldeoxynivalenol, and 15-Acetyldeoxynivalenol in Low-Temperature Plasmas

Fang

Zhang

Sun

et al. 2022

ACS Food Sci. Technol.

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“…Figure 8 shows a typical N 2 emission spectrum at the center wavelength of 337 nm. According to the reference [34], when the simulated spectral line fits well with the experimental spectral line, the N 2 rotation temperature can be obtained. Due to the high frequency of particle collisions at atmospheric pressure, the rotation temperature of gas molecules is very close to the gas temperature.…”

Section: Gas Temperature and Size Of Arc Dischargementioning

confidence: 99%

Influence of Arc Size on the Ignition and Flame Propagation of Cable Fire

Chen

Zhang

et al. 2021

Energies

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Cable fire caused by arc faults is one of the essential factors threatening the safe operation of a power system. The ignition and flame propagation of cable fire dependent on the characteristics of the arc discharge is lackingin in-depth understanding at present. In this work, with the constant electric power deposited into the arc discharge, the effects of arc size on the ignition and flame propagation of 110 kV XLPE cable fire are investigated for the first time. The arc size is changed by varying the gap distance of electrodes from 1.5 cm to 2.5 cm. It is interesting to find that the larger the arc size is, the faster the cable fire is ignited and propagates, and the larger the damaged area of the sheath of the cable is. Therein, when the gap distance increases from 1.3 cm to 3.1 cm, the equivalent impedance and the length of the arc discharge increase nearly seven times and three times, respectively. However, the gas temperature of the arc decreases slightly from 2280 K to 2100 K. In addition, a 3D model of the cable fire ignited by arc discharge is computed by Pyrosim software with fire dynamic simulation (FDS) module. Simulated results show that as the arc size increases, the cable fire is ignited faster, the flame propagates both vertically and horizontally increasing significantly, which is agreed well with the experimental results. This study deepens the understanding of the cable fire ignited by arc discharge and therefore it is useful for the evaluation and prevention of cable fire.

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“…Temperature measurements on the kINPen 24) were performed with a fiber optic thermal probe, which spectroscopically measures the bandgap of a GaAs crystal deposited at the tip of the optical fiber. 66) Comparisons between the gas temperature measured with thermal probes and with spectroscopic methods have been reported by several research groups, [67][68][69] e.g. Doyle et al examined four different methods to determine the gas temperature of an atmospheric argon microplasma jet: van der Waals broadening of argon spectral lines, spectral fitting of OH (A-X) and N 2 (C-B) spectra, and type K thermocouples.…”

Section: Nonequilibrium Atmospheric-pressure Plasma Sources and Gas T...mentioning

confidence: 99%

Insights into normothermic treatment with direct irradiation of atmospheric pressure plasma for biological applications

Yoshimura

Otsubo

Yamashita

et al. 2020

Jpn. J. Appl. Phys.

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Characterizing the interactions between plasma and living organisms has become a multidisciplinary topic in the field of low-temperature plasma science and technology. Living organisms are hierarchically comprised of cells, tissues, organs, and organ systems. Adaptive responses are systematically controlled by the state of the surrounding environment, such as when living organisms are irradiated with discharge plasma. This review is written from a biological perspective and focuses on the importance of gas temperature control in nonequilibrium atmospheric pressure plasmas. We discuss the critical parameters associated with direct plasma treatments of living organisms. This review provides an assessment of the status of this research field and addresses the prospects for further developments in understanding the interactions between plasma and living organisms. We address the importance and necessity of normothermic plasma treatment, where an experimental system involving living organisms is controlled at an optimal temperature, which plays a significant role in plasma biology.

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Use of thermocouples and argon line broadening for gas temperature measurement in a radio frequency atmospheric microplasma jet

Cited by 21 publications

References 19 publications

Effect of Reactive Chemical Species on the Degradation of Deoxynivalenol, 3-Acetyldeoxynivalenol, and 15-Acetyldeoxynivalenol in Low-Temperature Plasmas

Effect of Reactive Chemical Species on the Degradation of Deoxynivalenol, 3-Acetyldeoxynivalenol, and 15-Acetyldeoxynivalenol in Low-Temperature Plasmas

Influence of Arc Size on the Ignition and Flame Propagation of Cable Fire

Insights into normothermic treatment with direct irradiation of atmospheric pressure plasma for biological applications

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