Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1999-01-19
1999-12-28
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
G01N 2163
Patent
active
060088974
ABSTRACT:
A method and apparatus is disclosed for enhanced laser-induced plasma spectroscopic analysis of unknown heterogeneous materials. The apparatus has high power pulsed lasers with their beams focused on the material, typically two colinear lasers providing two pulses in the ultraviolet and in the near infrared spectral area. The first laser pulse vaporizes a small volume at the surface of the material and produces a plasma which is subsequently enhanced by the second laser pulse. The optical emission of the plasma is analyzed with a colinear optical spectrometer. The pulsed spectrum is detected by a gated photodiode array detector or by an array of photomultipliers each individually positioned to detect a line emission representative of a given element present in the material. The combination of the two laser pulses, appropriately synchronized, provides a plasma emission that is significantly stronger than a single laser pulse of the combined energy of the two pulses.
REFERENCES:
Briggs et al.,Direct Reading Laser Spectrometer, Western Electric Technical Digest, No. 35, Jul. 1974, pp. 9 and 10.
Cielo Paolo
Sabsabi Mohamad
St-Onge Louis
Evans F. L.
National Research Council of Canada
Szereszewski Juliusz
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