Optical probe for spatially resolved plasma emission and absorption spectroscopy

Rogoff, Gerald L.

doi:10.1364/ao.24.001733

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Absorption spectroscopy is in general a line-of-sight diagnostic technique. To achieve space-resolved densities [92] from the line-of-sight integrated densities, without inserting a probe into the plasma, several approaches are possible [93]. Tomography is the most precise method to achieve spatial resolution by multiple angle measurements although it requires very high experimental effort.…”

Section: Techniques Of Spatial Resolutionmentioning

confidence: 99%

Review on VUV to MIR absorption spectroscopy of atmospheric pressure plasma jets

Reuter

Sousa

Stancu

et al. 2015

Plasma Sources Sci. Technol.

110

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Absorption spectroscopy (AS) represents a reliable method for the characterization of cold atmospheric pressure plasma jets. The method's simplicity stands out in comparison to competing diagnostic techniques. AS is an in situ, non-invasive technique giving absolute densities, free of calibration procedures, which other diagnostics, such as laser-induced fluorescence or optical emission spectroscopy, have to rely on. Ground state densities can be determined without the knowledge of the influence of collisional quenching. Therefore, absolute densities determined by absorption spectroscopy can be taken as calibration for other methods. In this paper, fundamentals of absorption spectroscopy are presented as an entrance to the topic. In the second part of the manuscript, a review of AS performed on cold atmospheric pressure plasma jets, as they are used e.g. in the field of plasma medicine, is presented. The focus is set on special techniques overcoming not only the drawback of spectrally overlapping absorbing species, but also the line-of-sight densities that AS usually provides or the necessity of sufficiently long absorption lengths. Where references are not available for measurements on cold atmospheric pressure plasma jets, other plasma sources including low-pressure plasmas are taken as an example to give suggestions for possible approaches. The final part is a table summarizing examples of absorption spectroscopic measurements on cold atmospheric pressure plasma jets. With this, the paper provides a 'best practice' guideline and gives a compendium of works by groups performing absorption spectroscopy on cold atmospheric pressure plasma jets.

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Section: Techniques Of Spatial Resolutionmentioning

confidence: 99%

Review on VUV to MIR absorption spectroscopy of atmospheric pressure plasma jets

Reuter

Sousa

Stancu

et al. 2015

Plasma Sources Sci. Technol.

110

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“…Various approaches have been developed in the past to deal with the challenge of obtaining spatially resolved emission profiles in low-pressure plasmas. To circumvent the problem of line-of-sight integration, so-called optical probes for spatially resolved emission spectroscopy have been developed [28][29][30][31][32][33]. These probes consist of a ceramic tube inserted into the plasma and moved along the plasma cross section.…”

Section: Introductionmentioning

confidence: 99%

A novel probe for spatially resolved emission spectroscopy in plasmas

Du¹,

Çelik

Luggenhölscher³

et al. 2010

Plasma Sources Sci. Technol.

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A novel diagnostic device is developed to obtain spatially resolved emission profiles in plasmas. A ceramic tube is immersed into the plasma and moved along its longitudinal axis.A lens located at the other end of the ceramic tube images light onto an optical fiber which guides the light to a detector. In the case that the plasma emission is detected within a negligible solid angle, simple differentiation of the measured signal yields spatially resolved emission profiles. For non-negligible solid angles, spatial resolution can still be obtained by a more sophisticated evaluation. The design of the probe and the underlying theory are presented. The arrangement of the optics is analyzed in detail. Measurements in an inductively coupled radio-frequency (RF) hydrogen discharge in a GEC cell at different RF powers, neutral gas pressures and axial probe positions are performed. The obtained radial emission profiles of the Balmer-α line exhibit a torus-like structure which reflects the structure of the induced electrical field of the antenna. Furthermore, the transition from H to E mode at lower powers is observed.Based on a corona equilibrium model excitation rates are calculated out of electron energy distribution functions measured by an RF compensated Langmuir probe. A comparison of measured emission profiles with calculated excitation rate profiles shows very good agreement. Integrated emission profiles obtained by camera images are Abel inverted and compared with profiles obtained by the optical probe. The comparison demonstrates the advantage of the optical probe.

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Progress In Low Pressure Mercury–Rare-Gas Discharge Research

Maya

Lagushenko

1989

Advances in Atomic, Molecular, and Optical Physics

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Optical probe for spatially resolved plasma emission and absorption spectroscopy

Cited by 5 publications

References 7 publications

Review on VUV to MIR absorption spectroscopy of atmospheric pressure plasma jets

Review on VUV to MIR absorption spectroscopy of atmospheric pressure plasma jets

A novel probe for spatially resolved emission spectroscopy in plasmas

Progress In Low Pressure Mercury–Rare-Gas Discharge Research

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