Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1989-04-21
1991-01-22
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
356328, 356334, G01J 3443, G01J 318, G01N 2163
Patent
active
049866583
ABSTRACT:
A method and apparatus for in-process transient spectroscopic analysis of a molten metal, wherein a probe containing a pulsed high-power laser producing a pulsed laser beam having a substantially triangular pulse waveshape is immersed in the molten metal and irradiates a representative quantity of the molten metal. The pulsed laser beam vaporizes a portion of the molten metal to produce a plasma plume having an elemental composition representative of the elemental composition of the molten metal. Before the plasma plume reaches thermal equilibrium shortly after termination of the laser pulse, a spectroscopic detector in the probe detects spectral line reversals, as caused by absorption of radiation emitted by the hotter inner portion of the plasma plume to relatively coller outer portions of the plasma plume, during a short first time window. Thereafter, when the afterglow plasma is in thermal equilibrium, a second spectroscopic detector also in the probe performs a second short time duration spectroscopic measurement. A rangefinder measures and controls the distance between the molten metal surface and the pulsed laser.
REFERENCES:
patent: 3645628 (1972-02-01), Bojic et al.
patent: 4182574 (1980-01-01), Quillfeldt
patent: 4652128 (1987-03-01), Tsunoyama et al.
Lehigh University
McGraw Vincent P.
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