PLASMA-CATALYTIC SYSTEM WITH NARROW-APERTURE ROTATING GLIDING DISCHARGE

The article presents the results of the investigation of the rotating gliding discharge with the narrow aperture in the airflow. The photographs of the rotating gliding discharge with the narrow aperture were matched with its voltage oscillograms. Photographs were used to determine the maximum length of the discharge channel and its dependence on the airflow Gd into the discharge chamber. Voltage oscillograms were used to determine the difference between the maximum and minimum discharge voltage ΔU = Umax-Umin. The dependence of the electric field in the positive column on the airflow Gd into the discharge chamber was plotted. Optical emission spectra of the plasma of the rotating gliding discharge with a narrow aperture were captured and used to determine the distribution of the vibrational Tv and rotational Tr temperatures along the length of the plasma torch inside the reaction chamber.

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REFORMING OF ETHANOL IN PLASMA-CATALYTIC SYSTEM WITH DC AND AC ROTATING GLIDING DISCHARGE

10.46813/2021-131-117 ◽

2021 ◽

pp. 117-121

Author(s):

O.A. Nedybaliuk ◽

T.A. Tereshchenko ◽

I.I. Fedirchyk ◽

P.V. Tyshchuk ◽

V.P. Demchina

Keyword(s):

Synthesis Gas ◽

Emission Spectra ◽

Optical Emission ◽

Reaction Chamber ◽

Catalytic Reforming ◽

Instantaneous Power ◽

Wide Aperture ◽

Ethanol Reforming ◽

Gliding Discharge ◽

Optical Emission Spectra

The article presents the results of the investigation of the reforming of ethanol into synthesis gas using a plasmacatalytic system with either AC or DC wide-aperture rotating gliding discharge. Current and voltage oscillograms of the wide-aperture rotating gliding discharge were measured. The time-dependence of the instantaneous power of the discharge in the air was built. The photographs of the discharge in the airflow and discharge during the ethanol reforming were compared. The optical emission spectra of the plasmas of the torches of AC and DC wide-aperture rotating gliding discharges were studied. The rotational and vibrational temperatures of the plasma torch in the reaction chamber were determined. The results of the gas-chromatography of the synthesis gas produced during the plasm-catalytic reforming of ethanol using either AC or DC rotating gliding discharge are presented.

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Estimation of Junction Temperature in Operating Light Emitting Diodes

MRS Proceedings ◽

10.1557/proc-0955-i15-13 ◽

2006 ◽

Vol 955 ◽

Author(s):

Md. Shahrukh Sakhawat ◽

Arindra N Guha ◽

Okechukwu Akpa ◽

Ping Z Hagler ◽

Dake Wang ◽

...

Keyword(s):

Light Emitting Diodes ◽

Emission Spectra ◽

Optical Emission ◽

Peak Shift ◽

Junction Temperature ◽

Voltage Measurement ◽

Light Emitting ◽

Current Voltage ◽

The Difference ◽

Optical Emission Spectra

ABSTRACTLight emitting diodes (LEDs) are normally operated at high current levels resulting in substantial junction heating. However, the junction temperature cannot be measured directly. In the study reported here, it was attempted to estimate junction temperature in LEDs with peak emission 400 nm. Temperature was estimated from current-voltage (I-V) measurements as a function temperature and peak-shift of optical emission spectra with increasing temperature. For a diode operated at a current-level of 100 mA, a temperature of 100 °C was estimate from current voltage measurement and 160 °C from the peak-shift in the optical emission spectra. The difference in temperature estimated using the two different technique is not understood at this point.

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