Measurement of temperature and electrons density distribution of atmospheric arc plasma by moiré deflectometry technique

Meidanshahi, Fatemeh Salimi; Madanipour, Khosro; Shokri, Babak

doi:10.1016/j.optlaseng.2012.11.018

Cited by 22 publications

(13 citation statements)

References 29 publications

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“…4(e)), which was used to safely characterize the length of filament. The length of plasma filament obtained by this method was more precisely compared to traditional methods [18][19][20][21][22][23][24] which are unable to detect weakly ionized region along the plasma channel.…”

Section: Length Characterization Of Plasma Filamentmentioning

confidence: 99%

“…Knowing the longitudinal distribution of electron density is significant for the applications of the plasma channel. General categories of plasma characterization include electric and optical methods, for example, current method [16,17], electrical conductivity [18], Schlieren and shadowgraphy techniques [19,20], moiré deflectometry technique [21], longitudinal diffractometric technique [22], ionization induced fluorescence technique [23]. The reported plasma density measurement techniques have a poor sensitivity to weakly ionized plasma and besides that some are too complex [21][22][23][24] or have low precision [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Probing the effective length of plasma inside a filament

Liu¹,

Wang²,

Chen³

et al. 2017

Opt. Express

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We present a novel method based on plasma-guided corona discharges to probe the plasma density longitudinal distribution, which is particularly good for the weakly ionized plasmas (~10 cm). With this method, plasma density longitudinal distribution inside both a weakly ionized plasma and a filament were characterized. When a high voltage electric field was applied onto a plasma channel, the original ionization created by a laser pulse would be enhanced and streamer coronas formed along the channel. By measuring the fluorescence of enhanced ionization, in particular, on both ends of a filament, the weak otherwise invisible plasma regions created by the laser pulse were identified. The observed plasma guided coronas were qualitatively understood by solving a 3D Maxwell equation through finite element analysis. The technique paves a new way to probe low density plasma and to precisely measure the effective length of plasma inside a filament.

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Section: Length Characterization Of Plasma Filamentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probing the effective length of plasma inside a filament

Liu¹,

Wang²,

Chen³

et al. 2017

Opt. Express

View full text Add to dashboard Cite

show abstract

“…d, d M and λ are the pitch of gratings, the pitch of moiré fringes and the wavelength of probe beam respectively. For an axisymmetric object, the refractive index can be written in cylindrical coordinate as [4]:…”

Section: Theorymentioning

confidence: 99%

“…In high gradient refractive index the methods are inefficient. Schileren, shadowgraphy and moiré deflectometery are more appropriate for high gradients [3,4].…”

Section: Introductionmentioning

confidence: 99%

Measurement of plasma parameter in Dielectric Barrier Discharge (DBD) by Moiré deflectometry technique

et al. 2015

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In this work it is shown that the refractive index and temperature distribution of atmospheric Dielectric Barrier Discharge (DBD) plasmas are measured by Moiré deflectometry. Fringe analysis is used to calculate Moiré deflection and to evaluate refractive index in different points of plasma. By Sa-Ha equation and considering the first ionization, the dependence of refractive index and temperature, electrons, ions and molecules number densities of DBD plasma is obtained. By knowing this relation between plasma parameters, the spatial distributions of the plasma refractive index and temperature are evaluated. The advantages of this method are: simplicity, non-contact, non-destructive measurement, low cost, high accuracy and direct measurement of refractive index gradient.

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“…On the other hand, optical methods are mainly fast, non-intrusive and accurate [8]. There exists many optical methods such as Interferometry [9][10][11], Laser speckle technique [12], Schlieren photography [13][14][15] and Moiré deflectometry [16][17][18][19] that have been studied to obtain and visualize the temperature field of gaseous flames. All the interferometry methods, including Mach-Zehnder interferometry [20,21], Talbot interferometry [22][23][24][25] and Holographic interferometry [26,27] are based on changes in the refractive index of the gaseous products of the flame.…”

Section: Introductionmentioning

confidence: 99%