Distribution of excited species in plasmas by monochromatic imaging

Hareland, W.A.; Buss, Richard J.

doi:10.1109/27.491740

Cited by 5 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Monochromatic images were acquired and processed by Kinrot for inspecting aluminum vapor in a helium arc [8]. The distribution of excited species in radio frequency was measured using monochromatic imaging [9]. Moreover, temperature and metal-vapor quantity in a copper breaking arc were measured using a pair of colored charge coupled device (CCD) linear image sensors with additional filters [10].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic diagnostics of temperatures for a non-axisymmetric coupling arc by monochromatic imaging

Zhang¹,

Xiong²,

Hu³

2010

Meas. Sci. Technol.

View full text Add to dashboard Cite

The twin-electrode TIG coupling arc is a newly developed non-axisymmetric welding arc. The imaging method that consists of a high-speed camera with a narrow-band filter has been used to obtain monochromatic images of a coupling arc at atmospheric pressure. The spatial emission coefficients of the non-axisymmetric coupling arc are reconstructed by means of the Maldonado method. Under the assumption of local thermodynamic equilibrium, the temperature distribution of the coupling arc has been determined. The temperature distribution is similar to an ellipse, and the short axis of the ellipse is in the direction that the two electrodes are arranged along. The highest temperature area is in the middle of both electrodes. It indicates that there is a strong interaction within the coupling arc. The results show that the imaging method is an efficient way of characterizing the non-axisymmetric coupling arc.

show abstract

Section: Introductionmentioning

confidence: 99%

Spectroscopic diagnostics of temperatures for a non-axisymmetric coupling arc by monochromatic imaging

Zhang¹,

Xiong²,

Hu³

2010

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…One method uses a monochromator to obtain two-dimensional images. Its utilization is extensive, such as inspecting aluminum vapor in a helium vacuum arc [8] and measuring the distribution of excited species in a radio frequency (RF) plasma [9]. Another method using narrow-band filters in conjunction with two-dimensional imaging detectors, which is relatively simple and has a very short acquisition time, is also widely used.…”

Section: Introductionmentioning

confidence: 99%

Time and spatially resolved spectroscopic measurement of temperatures in a free-burning arc by monochromatic imaging

Ma¹,

Gao²,

Wu³

et al. 2008

Meas. Sci. Technol.

View full text Add to dashboard Cite

An imaging method that involves a high-speed camera and a narrow-band filter has been used to acquire images of the argon atomic line intensity of a free-burning arc plasma at atmospheric pressure. The measured lateral intensities are converted to radially distributed emission coefficients by means of an Abel inversion. Under the assumption of local thermodynamic equilibrium, the time resolved temperature distributions in the arc have been determined. Both the intensities and temperatures indicate that the arc was gradually evolving toward a static state after it was ignited; the temperature at any position of the arc column shows the same decreasing trend. These results demonstrate that this method enables the time and spatially resolved properties of plasmas to be characterized and thus it may bring new findings and applications concerning the diagnostics of plasmas.

show abstract

Instabilities in a dusty plasma with ion drag and ionization

1999

View full text Add to dashboard Cite

Low-frequency modes that develop as a result of an instability in a dusty rf discharge plasma were studied experimentally, leading to an empirical explanation for the instability. In the experiment, particle diameter grew with time. Two instability modes appeared after growth to a sufficient size. A filamentary mode appeared abruptly, and later a great void mode developed as a dust-free region with an intense glow inside and a sharp boundary outside. These modes were characterized by two-dimensional laser light scattering, video imaging, optical emission spectroscopy, Langmuir probe measurements, and Fourier analysis of the fluctuation spectrum. Dust growth was measured by electron microscopy and optical extinction, yielding the dust particle size and dust number density. The electron density was found to be enhanced inside the great void, due to an absence of electron depletion on the dust grains. The great void was explained by the ion drag force, which becomes stronger than the opposing Coulomb force once the particle size reaches a critical diameter. When a dust-free region develops, its electron density is enhanced, the ionization rate increases, and the ion flow that pushes particles outward is further augmented. The plasma used in the experiment grew particles by sputtering of the electrodes, although the same instabilities are expected to occur in other types of dusty plasma discharges as well. ͓S1063-651X͑99͒00801-6͔

show abstract

Distribution of excited species in plasmas by monochromatic imaging

Cited by 5 publications

References 3 publications

Spectroscopic diagnostics of temperatures for a non-axisymmetric coupling arc by monochromatic imaging

Spectroscopic diagnostics of temperatures for a non-axisymmetric coupling arc by monochromatic imaging

Time and spatially resolved spectroscopic measurement of temperatures in a free-burning arc by monochromatic imaging

Instabilities in a dusty plasma with ion drag and ionization

Contact Info

Product

Resources

About