Data Processing System for the Automatic Transformation of Observed Plasma Intensities into their Radial Distribution

Paquette, D. R.; Wiese, Wolfgang L.

doi:10.1364/ao.3.000291

Cited by 25 publications

(5 citation statements)

References 8 publications

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“…Assuming that the discharge has cylindrical symmetry , the radial variation p of the spectra may be unfolded by stepping the arc image across the entrance slit of the spectrograph and obtaining a spectrum for each step . With these data , an Abe l inversion may be performed to obtain the spatially resolved spectra [12][13][14][15] …”

Section: Emission Intensitymentioning

confidence: 99%

Studies of Transient Discharges.

Williams¹,

Gundersen²

1979

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Section: Emission Intensitymentioning

confidence: 99%

Studies of Transient Discharges.

Williams¹,

Gundersen²

1979

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“…Note that no backlight is employed in making observations in zones where emission can be observed. The observed intensity is then given by: /¡=(2' ^) lO'UlL^) (7) Equation 7 is inverted by first finding the Kj in an absorption experiment as described in Equation 5 and then compensating the observed intensity for self-absorption by multiplying both sides of Equation 7 by icrus:./*)…”

Section: Self-absorption and The Abel Inversionmentioning

confidence: 99%

“…High intensity light sources are finding increased applicability for spectrochemical analyses (1, 2), particularly in kinetic methods (3,4) where high precision is required for measurement of small changes in absorbance and in atomic fluorescence (5, 6) and molecular fluorescence determinations (7,8) where high source intensity leads to increased sensitivity. Photon statistical variations (9), which establish a fundamental limit on the attainable photometric precision, are improved by the high photon fluxes obtained from intense light sources.…”

Section: Conclusion and Prospectivesmentioning

confidence: 99%

“…A spatially-resolved study of an arc discharge has been performed by Olsen (3), and the method of Cremers and Birkebak (4) has been employed in studying inductively coupled plasmas (5). Analog as well as digital inversion techniques have been designed (6,7). Maldonado and Olsen (8, 9) have developed a technique for performing the Abel Inversion on asymmetric sources using a series expansion of the emission intensity in terms of Hermite polynomials.…”

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confidence: 99%

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Considerations for implementing spatially-resolved spectrometry using the Abel Inversion

Scheeline¹,

Walters²

1976

Anal. Chem.

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The effecthog dose regression lines relative to the intensity of response of the instrument for the concentrations of the elements studied show, in each case, a significantly straightline relationship.Having constructed a working-straight-line relationship for each of the elements under examination, for a given interval of concentration, it is possible to make quantitative measurements on any type of biological material, provided that this has previously undergone ashing, grinding, and compressing into tablets. The values of concentration determined by means of these working relationships are referred to the ashed material; knowing the reduction in weight resulting from ashing, it is easy to calculate back to the concentration in the initial damp material.The method described is simple to apply for the determination of the elements that we studied and may be extended by similar methods to the determination of other elements, within the limits of the possibilities of the line of analysis and of the actual possibility of achieving consistent standards.At present, the analysis technique here described is usefully employed in studies that are being carried out on the distribution of trace elements in certain rabbit organs and on their physiological implications.Obtaining spatially-resolved information from a plasma dlscharge is not necessarily a straightforward operation. Such phenomena as self-absorption, contlnuum background, discharge wander, and measurement noise may make meaningful spatially-resolved emission line profiles difficult or imposslble to obtain unless the numerous optical properties of the discharge are considered carefully and systematically. Herein, several measurement-distorting phenomena are discussed in terms of the Abel Inversion, a common calculational technique for elucidating radial emlsslon llne proflles.

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“…There have been many attempts to build hard-wired computers for the calculation of the radial emission coefficient or to develop desk calculator methods which allow, the evaluation of the data in the laboratory after the experiment. In some cases, when the accuracy is not too critical and the time needed for the large number of interactions between man and machine is not considerably longer than the experiment itself, these methods may be appropriate [ 1 ], [2], [3]. But all of these methods fail if one has to carry out line profile measurements with a high spectral resolution and a high dynamic range.…”

Section: Introductionmentioning

confidence: 99%

On-line Data Acquisition System for Stationary and Nonstationary Spectroscopic Research

Arning¹

1976

Journal of Non-Equilibrium Thermodynamics

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A data acquisition system which allows fast collection of stationary and nonstationary Spectroscopic data from cylindrical sources is described. This is achieved by using a small computer for the control of the optical and electronic equipment, data gathering and compressing as well as some initial calculations. For extensive calculations the data are transferred to a larger Rank-Xerox Sigma 9 computer. The computers work in a master-slave mode, although each can be the master or the slave. Some results of the measurements are given at the end.

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Data Processing System for the Automatic Transformation of Observed Plasma Intensities into their Radial Distribution

Cited by 25 publications

References 8 publications

Studies of Transient Discharges.

Studies of Transient Discharges.

Considerations for implementing spatially-resolved spectrometry using the Abel Inversion

On-line Data Acquisition System for Stationary and Nonstationary Spectroscopic Research

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