Utilisation des étincelles glissantes pour l'analyse spectrale dans l'ultraviolet lointain. Possibilité de détection et dosage du soufre, du phosphore et du carbone dans les aciers

Balloffet, Germaine; Romand, Jacques-André

doi:10.1051/jphysrad:01955001606049001

Cited by 12 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exception is the C + 90.41 nm line, because the background continuum in this region is very low and the emission intensity of this line is relatively high (as shown in figure 4). The unprecedented detection limit of 87 ppm obtained from the 97.70 nm C 2+ line (compared to 100 ppm obtained by Balloffet and Romand [58] from the same line using the sliding vacuum spark technique) indicates that this line is the most sensitive carbon line in the VUV region, and therefore is the most suitable one for carrying out further quantitative analyses of metals and alloys to determine their carbon content. This detection limit could be further improved by carrying out other optimization procedures on different experimental parameters, for example ambient atmosphere and pressure; laser pulse energy and wavelength harmonics or by using a charge coupled device (CCD) detector which certainly provides a greater sensitivity and a better resolution.…”

Section: Limits Of Detectionmentioning

confidence: 74%

“…The limits of detection for the five carbon lines are shown in table 4. Also in the table, for the C 2+ 97.70 nm line, a comparison is made with the only value available from the literature [58]. The limits of detection (c L ) in the present work were determined from the well known expression [65] c L = 3σ (I b )/S (6) where σ (I b ) is the standard deviation of measurements of the background intensity and S is the slope of the calibration curve for each relevant spectral line.…”

Section: Limits Of Detectionmentioning

confidence: 99%

“…We explore the effectiveness of space-resolved spectroscopy in eliminating the need for more expensive time-gated detectors and employ a VUV set-up as the ions of carbon (as well as several other light (low atomic number) elements) have their strongest emission spectra in this region [45]. In this context, Balloffet and Romand [58], in an early VUV investigation, used the sliding vacuum spark technique for the quantitative determination of C, S and P in steel samples. A VUV spectral line at 97.70 nm due to doubly-ionized carbon (C 2+ ) was used for the carbon content identification and a detection limit of 100 ppm was obtained for this line.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Time-integrated laser-induced plasma spectroscopy in the vacuum ultraviolet for the quantitative elemental characterization of steel alloys

Khater

Kampen

Costello

et al. 2000

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

This paper demonstrates that time-integrated space-resolved laser-induced plasma spectroscopy (TISR-LIPS) is a useful technique in the vacuum ultraviolet (VUV) for the quantitative determination of the carbon content in steels. The standard reference samples used were carbon-iron alloys containing a relatively wide concentration range of carbon (0.041-1.32%). In the experiments the output of a Q-switched Nd:YAG (1064 nm) laser, with approximately a 1 J maximum output pulse energy and approximately a 12 ns temporal pulse width, was focused onto the surface of each sample (under vacuum) in order to produce the emitting plasma. A fore-slit mounted in the target chamber allowed spatially-resolved spectral measurements in the axial direction of the plasma and provided emission lines that were almost free of the background continuum. A 1 m normal incidence vacuum spectrometer, equipped with a 1200 grooves mm −1 concave grating and a micro-channel plate/photodiode array detector combination, was used as the detection system. A particularly interesting feature of this work is the demonstration that VUV spectroscopy allows ionic lines to be used and linear calibration curves were obtained for the five carbon spectral lines (from C + and C 2+ ) under investigation. The limits of detection for all lines were determined; the lowest detection limit (87 ± 10 ppm) was obtained from the C 2+ 97.70 nm line, which compares favourably with the only available value in the literature of 100 ppm.

show abstract

Section: Limits Of Detectionmentioning

confidence: 74%