Effect of the electric field profile on the accuracy of E-FISH measurements in ionization waves

Chng, Tat Loon; Pai, David; Guaitella, Olivier; Starikovskaia, Svetlana; Bourdon, Anne

doi:10.1088/1361-6595/ac4592

Cited by 18 publications

(19 citation statements)

References 42 publications

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“…The polarization of the E-FISH signal is found to coincide with the external electric field vector, independent of the polarization of the probe beam [3,23]. However, the results from the previous two sections have indicated that both components of the E-FISH signal are affected by the probe beam polarization.…”

Section: Polarization Of the E-fish Signalmentioning

confidence: 79%

“…However, in order to facilitate calibration and measurement, the electric field distribution in most E-FISH measurements is spatially constructed. In single-filament streamer discharges [17,23] and diffuse discharges [9,11], the electric field distribution is symmetrical along the axis. The integral term in equation ( 9) can be rewritten as:…”

Section: Polarization Of the E-fish Signalmentioning

confidence: 99%

“…The spatial evolution of the E-FISH signal and the effects of the focused probe beam parameters and electric field distribution on the accuracy of E-FISH measurement have been extensively investigated and comprehended [23,24]. The intensity of the final E-FISH signal is strongly influenced by the amplitude and distribution of the external electric field, wave vector mismatch, Rayleigh range and the interaction length between the external electric field and the probe beam [24].…”

Section: Introductionmentioning

confidence: 99%

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Polarization properties of E-FISH signals and optimization of simultaneous measurement of electric field vectors

Zheng,

Zhao,

Zheng

et al. 2024

Plasma Sources Sci. Technol.

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Electric field measurements based on the E-FISH method have been employed in a wide range of studies. Most studies typically measure two components of the electric field separately. Although there have been proposals for the simultaneous measurement of electric field vectors, the imbalance of the two corresponding E-FISH signals has limited its application. Furthermore, the relationship between the polarization of the E-FISH signal and the direction of external electric field remains unclear. In this paper, the general expressions for the polarization and power of both components of E-FISH signals are derived, assuming arbitrary probe beam polarization and external electric field direction. The theoretical results indicate that the polarization of E-FISH signals varies along the interaction length. The final signal's polarization is elliptically polarized for arbitrary electric field distribution and is correlated with the polarization of the probe beam, which deviates from what is commonly assumed to be consistent with the external electric field. If the polarization of the probe beam is not parallel to the axes, the power of each signal component is determined by both components of the external electric field, which lays the foundation for the simultaneous measurement of electric field vectors. This theoretical prediction is subsequently validated by experimental results. Finally, the power maps suggest that the optimal polarization angle of the probe beam is 45° or 135° to achieve a balanced signal power when measuring an unknown electric field vector. Both components of the electric field can be simultaneously obtained according to the theoretical relationship.

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Section: Polarization Of the E-fish Signalmentioning

confidence: 79%

Section: Polarization Of the E-fish Signalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polarization properties of E-FISH signals and optimization of simultaneous measurement of electric field vectors

Zheng,

Zhao,

Zheng

et al. 2024

Plasma Sources Sci. Technol.

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“…Due to these uncertainties, we will not discuss the effects of dielectric thicknesses and pulse numbers on n e . Advanced laser diagnostics such as Thomson scattering [65] or E-FISH [66,67] can be used to reduce the uncertainties. However, stabilizing the micro discharges at one location for plasma and laser interaction is also challenging.…”

Section: Optical Emission Spectroscopy (Oes)mentioning

confidence: 99%

How pulse energy affects ignition efficiency of DBD plasma-assisted combustion

Patel,

Peelen,

van Oijen

et al. 2023

J. Phys. D: Appl. Phys.

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This work aims to find how coupled energy per pulse influences the ability of a pulsed dielectric barrier discharge (DBD) plasma to ignite fuel-lean methane–air flow. For that, experiments are performed on a custom-built DBD flow reactor with a variable dielectric thickness and the discharge is operated by bursts of 10 ns duration pulses at 3 kHz repetition rate. With an increase in dielectric thickness, we observe that the coupled energy per pulse decreases even though applied voltage conditions are similar and so more pulses are required to ignite the lean mixture. Interestingly, we observe a significant increase in the minimum ignition energy (MIE) with an increase in the thickness beyond 3 mm. Moreover, the ignition kernel growth rate is much slower in the thicker dielectric cases even though total energy coupling per burst is similar. This phenomenon is investigated further by evaluating plasma parameters using electrical and optical diagnostics. Effective dielectric capacitance, discharge current, and voltage drop across the gas gap are derived from an equivalent circuit analysis, whereas plasma gas temperature and effective reduced electric field ( E / N ) are estimated from optical emission spectroscopy. From these analyses, we conclude that a thicker dielectric limits the discharge current and so the plasma filament temperature. For more than 3 mm thick dielectric cases, the filament heating per pulse is too low to achieve strong enough plasma pulse-to-pulse coupling which eventually leads to higher MIE and slower ignition kernel growth rate or the inability to ignite at all.

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“…A method to measure the electric field which has become popular in recent years is Electric Field Induced Second Harmonic generation (E-FISH). However, this method suffers from complications which make it very hard to use for the quantitative determination of electric fields with unknown spatial distributions [5,9].…”

Section: Introductionmentioning

confidence: 99%

High-resolution electric field and temperature distributions in positive streamers

et al. 2023

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In this work, we aim to take a detailed experimental picture of the positive streamer. We apply optical emission spectroscopy to the first negative system (FNS, B2Σu+→X2Σg+) of N2+ and the second positive system (SPS, C3Πu → B3Πg) of N2. Large, centimeter wide, and highly reproducible streamers are created in pure nitrogen and synthetic air, at pressures ranging from 33 to 266 mbar. Direct time resolved spectral imaging of the space charge layer resulted in spatiotemporal maps of the calculated reduced electric field strength (E/N) and rovibrational temperature in sub-nanosecond and sub-millimetre resolution. The E/N peaks at approximately 540 and 480 Td, directly in front of the space charge layer, for synthetic air and pure nitrogen respectively, as determined by using the intensity ratio method of FNS and SPS. A global model for pure nitrogen in PLASIMO uses the experimentally determined E/N distribution to draw a picture of the gas kinetics around the space charge layer passage. In addition, the results of the global model serve as a reference to interpret the rotational and vibrational temperatures obtained from experimental FNS and SPS emissions.

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Effect of the electric field profile on the accuracy of E-FISH measurements in ionization waves

Cited by 18 publications

References 42 publications

Polarization properties of E-FISH signals and optimization of simultaneous measurement of electric field vectors

Polarization properties of E-FISH signals and optimization of simultaneous measurement of electric field vectors

How pulse energy affects ignition efficiency of DBD plasma-assisted combustion

High-resolution electric field and temperature distributions in positive streamers

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