Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1994-08-11
1996-07-16
Gonzalez, Frank
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
356318, G01J 330
Patent
active
055372074
ABSTRACT:
To determine the carbon black distribution two measurements of spectral intensities of separately produced plasmas are carried out with different time delays relative to a particular laser pulse, the time delay for the second measurement for determining the spectral line intensities of a reference element carbon (I.sub.C,) and at least one analysis element (I.sub.A.n,) being smaller than for the first measurement; for determining the spectral line intensities of the reference element (I.sub.C) and the other analysis elements (I.sub.A.n).
Evaluation of the measurements is performed by reference to calibration information based on reference measurements, which information shows the magnitude of the concentration ratio of the other analysis elements or the at least one analysis element to the reference element (c.sub.A.n /c.sub.C or c.sub.A.n /c.sub.R) as a function of the appurtenant intensity ratio values. By comparison between the intensity ratio values from both measurements with the calibration information, using the concentration of total carbon (c.sub.C) and that of the selected analysis element (c.sub.A.n), the magnitude of the carbon black concentration (c.sub.R) is determined.
REFERENCES:
patent: 4301411 (1981-11-01), Wardell et al.
patent: 4641968 (1987-02-01), Grandy
"Time-Resolved Laser-Induced Breakdown Spectroscopy of Iron Ore"; K. J. Grant, G. L. Paul, J. A. O'Neill; 1369 Applied Spectroscopy 44(1990) Dec., No. 10, Frederick, MD, US.
"Materials Analysis using Laser-Based Spectroscopic Techniques"; By B. J. Goddard, BSc, PhD; vol. 13 (1991) No. 3, London, GB 2190a Transactions of the Institute of Measurement and Control
Carlhoff Christoph
Jogwich Martin
Lorenzen Claus-Jurgen
Nahmias Marco
Eisenberg Jason D.
Fried. Krupp AG Hoesch-Krupp
Gonzalez Frank
Pirelli Coordinamento Phenumatici S.p.A.
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