Optical fiber sensing of corona discharges

Woolsey, G. A.; Lamb, David; Woerner, M.

doi:10.1117/12.50946

Cited by 4 publications

(12 citation statements)

References 7 publications

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“…In the same circumstances the minimum value of the static field (at the plane cathode) is E min ≈ 1.5 × 10 5 V m −1 . These values are in accordance with the ones reported by Woolsey et al [21], taking into account that distinct values of V A , d and ρ c are used by these authors.…”

Section: Streamer Modelsupporting

confidence: 92%

“…The numerical value of wind velocity close to the plane cathode, at the position z m ≈ 0.94 cm, just before the wind hits the surface (putting to zero the axial component of velocity), are close to the experimental [33,[35][36][37] or simulated ones [14], although somewhat higher (40 m s −1 instead of 10-30 m s −1 ). But it must be emphasized that the values of the velocity u cathode are generally (although not always [21]) obtained just behind a grid cathode with a Pitot tube, so that there is an averaging over a section of several mm 2 [18]. The radial profile of axial velocity u(z m , r) is very sharp, as can be observed in figure 8 and confirmed by recent measurements with a small diameter (0.2 mm 2 ) Pitot tube [37], so that the velocity on the very axis can be only extrapolated and is probably higher than the averaged measurements.…”

Section: Axial Velocity Profile Along the Axis Comparison With Experi...mentioning

confidence: 99%

“…The electrohydrodynamical study, both experimental and theoretical, performed by Yabe et al [14] in wire-plane configuration corresponds rather to 'dark discharge' [15,16] than to real corona discharge and the weakness of discharge current is probably the reason why the wind velocities are low when compared to the values given by Sigmond et al [11]. Besides these studies, other contributions can be quoted such as those of Thanh [17], Sato [18], Gagarin et al [19], Mityushin et al [20] and Woolsey et al [21].…”

Section: Introductionmentioning

confidence: 95%

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Hydrodynamical simulation of the electric wind generated by successive streamers in a point-to-plane reactor

Loiseau

Batina

Noel

et al. 2002

J. Phys. D: Appl. Phys.

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An electrical corona discharge at atmospheric pressure in positive point-to-plane configuration creates an electric wind from the point to the plane which, within a few seconds, generates an axisymmetrical vortex in a closed cylindrical vessel (ring vortex). A first model for the establishment of this vortex was recently published and our study is an evolution based on an improved physical model. It does not include any empirical time scaling parameter, and takes into account the successive ionizing fronts as a varying electrical force due to the propagation of a sharp electrical field maximum acting on the space charge distribution along the interelectrode gap. After the front propagation (50 ns), the remaining positive ions drift (during 100 µs) in the slowly restoring electric field. Numerical simulations show that the very first streamers and remaining positive ions rapidly push the gas along the very narrow discharge volume, creating a small ring vortex at the cathode around the discharge axis. The following ones have a cumulative effect leading to the enlargement of the vortex. In a few seconds, a quasi-stationary distribution is obtained, which is very close to the experimentally observed steady state.

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Section: Streamer Modelsupporting

confidence: 92%

Section: Axial Velocity Profile Along the Axis Comparison With Experi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Hydrodynamical simulation of the electric wind generated by successive streamers in a point-to-plane reactor

Loiseau

Batina

Noel

et al. 2002

J. Phys. D: Appl. Phys.

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show abstract

“…Corona wind velocity measurements obtained using LDA are in error, however, because scattering particles introduced into the corona gap become charged, so that they derive a velocity component due to drift in the electric field. As a result, LDA measurements overestimate the velocity of the corona wind, by up to 30% (Sato 1980;Woolsey et al …”

Section: (3b) Measurement Of the Corona Windmentioning

confidence: 99%

“…1, with a short length (20 mm) of piezoelectric film (polyvinylidene fluoride) bonded to the measuring fibre, we have measured electric fields in the corona gap (Woolsey et al 1991). However, the relatively large film size which is needed to provide an acceptable sensitivity of 10 kV cm " !…”

Section: (3e) Electric Fieldmentioning

confidence: 99%

Measurement of Electrical Discharge Parameters Using Optical Fibres

Everett¹,

Jones²,

Scelsi³

et al. 1995

Aust. J. Phys.

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A consequence of the development of optical fibre technology for communications has been the application of optical fibres to the sensing of a wide range of physical and chemical parameters. Many of the properties of fibres that are important for communications' are significant for sensing: these include their insulating nature, their small dimensions, and their immunity to high voltage and electromagnetic radiation. These attributes are particularly significant for sensing electrical discharges, and this review presents a discussion of the potential of optical fibre sensing for discharge parameters, the results of some recent optical fibre measurements made on corona and glow discharges, and suggestions for other discharge. probing approaches using optical fibres.

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Hydrodynamical simulation of the electric wind in a cylindrical vessel with positive point-to-plane device

Batina

Noel

Lachaud

et al. 2001

J. Phys. D: Appl. Phys.

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Electrical corona discharges at atmospheric pressure in a positive point-to-plane configuration create an electric wind from the point to the plane which, in a closed cylindrical vessel, generates in a few seconds axisymmetrical vortices in the vessel. Photography and video recording show that a small ring vortex appears around the discharge axis, close to the plane, enlarges and progressively fills the vessel up to a stationary situation. A simplified stationary model was first used in order to take into account the measured values of the wind velocity along the discharge axis as well as the velocity field lines visualized by smoke particles. Simulation and experimental results are in fairly good agreement, and a few particular adjustments concerning temperature profiles were made to improve the numerical results. Then, a dynamical model, including the effect of the repetitive ionizing fronts (streamers) occurring in the filamentary discharge, allows one to render an account of the transient evolution of the velocity field lines towards the stationary vortices. Although the numerical simulation could not be continued to a steady state, it shows that a small ring vortex is created near the point electrode, moves rapidly from the point to the plane and then begins to enlarge at the right (experimental) place.

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Optical fiber sensing of corona discharges

Cited by 4 publications

References 7 publications

Hydrodynamical simulation of the electric wind generated by successive streamers in a point-to-plane reactor

Hydrodynamical simulation of the electric wind generated by successive streamers in a point-to-plane reactor

Measurement of Electrical Discharge Parameters Using Optical Fibres

Hydrodynamical simulation of the electric wind in a cylindrical vessel with positive point-to-plane device

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