Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1990-09-24
1991-08-27
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
209579, G01N 2163, G01N 2185
Patent
active
050429477
ABSTRACT:
Disclosed is a process and apparatus to analyze metal particles to determine their composition and to generate a sorting signal. The particles are exposed to a pulsed laser beam by which they are partly vaporized to form a plasma so that the particles are cleaned and the cleaned area is subsequently partially vaporized by a pulsed laser beam to form a plasma. The spectral lines of the plasma are inspected for an identification of the composition of the metal particles. The required inspection rate of 30 particles per second can readily be achieved or even exceeded if a defined narrow wavelength range or a defined wavelength is filtered from the total radiation that is emitted by the plasma and the intensities of the filtered partial radiations are related to each other to obtain ratios, which are compared with adjustable limiting values. A sorting signal is derived from the result of said comparison. The inspection rate can be improved in that the partial radiation is subjected to a comparison only for a defined interval of time.
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Applied Spectroscopy, Band 41, Nr. 4, May/Jun. 1987, pp. 572-579, Soc. for Applied Spectroscopy, Frederick, Maryland, U.S.; D. A. Cremers.
Applied Spectroscopy, Band 40, Nr. 4, May/Jun. 1986, pp. 491-494, Soc. for Applied Spectroscopy, Frederick, Maryland, U.S.; J. A. Millard et al.
EOSD Elektro-Optical Systems Design, Band 14, Nr. 10, Oct. 1982, pp. 35-41, Chicago, Illinois, U.S.; T. R. Loree et al.
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Loree, T. R., Radziemski, L. J.: The Identification of Impurities in Metals by Laser-induced Breakdown Spectroscopy, Proc. Tech. Program-Electro-Opt./Laser Conf. Expo 1081, pp. 28-33.
Hohla Kristian
Loree Thomas R.
Potzschke Manfred
Sattler Hans-Peter
McGraw Vincent P.
Metallgesellschaft Aktiengesellschaft
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