CA2296623A1 - Method and apparatus for materials analysis by enhanced laser induced plasma spectroscopy - Google Patents

Method and apparatus for materials analysis by enhanced laser induced plasma spectroscopy Download PDF

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Publication number
CA2296623A1
CA2296623A1 CA002296623A CA2296623A CA2296623A1 CA 2296623 A1 CA2296623 A1 CA 2296623A1 CA 002296623 A CA002296623 A CA 002296623A CA 2296623 A CA2296623 A CA 2296623A CA 2296623 A1 CA2296623 A1 CA 2296623A1
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Canada
Prior art keywords
plasma
pulses
laser pulse
laser
emission
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CA002296623A
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French (fr)
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CA2296623C (en
Inventor
Paolo Cielo
Louis St-Onge
Mohamad Sabsabi
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National Research Council of Canada
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National Research Council of Canada
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Publication of CA2296623A1 publication Critical patent/CA2296623A1/en
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Publication of CA2296623C publication Critical patent/CA2296623C/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
    • G01N21/718—Laser microanalysis, i.e. with formation of sample plasma

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 collinear 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 collinear 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.
CA002296623A 1999-01-19 2000-01-17 Method and apparatus for materials analysis by enhanced laser induced plasma spectroscopy Expired - Fee Related CA2296623C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/232,722 1999-01-19
US09/232,722 US6008897A (en) 1999-01-19 1999-01-19 Method and apparatus for materials analysis by enhanced laser induced plasma spectroscopy

Publications (2)

Publication Number Publication Date
CA2296623A1 true CA2296623A1 (en) 2000-07-19
CA2296623C CA2296623C (en) 2004-06-22

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Family Applications (1)

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CA002296623A Expired - Fee Related CA2296623C (en) 1999-01-19 2000-01-17 Method and apparatus for materials analysis by enhanced laser induced plasma spectroscopy

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US (1) US6008897A (en)
EP (1) EP1147402A1 (en)
CA (1) CA2296623C (en)
WO (1) WO2000043755A1 (en)

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Also Published As

Publication number Publication date
WO2000043755A1 (en) 2000-07-27
US6008897A (en) 1999-12-28
CA2296623C (en) 2004-06-22
EP1147402A1 (en) 2001-10-24

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