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

  • US 6,008,897 A
  • Filed: 01/19/1999
  • Issued: 12/28/1999
  • Est. Priority Date: 01/19/1999
  • Status: Expired due to Fees
First Claim
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1. A method for spectroscopic analysis of a heterogeneous material, the method comprising:

  • a) directing a first single high intensity laser pulse at the surface of said material to generate an ionized plasma,b) waiting a time period that is shorter than sufficient for said plasma to lose its ionization, thenc) directing a second single high intensity laser pulse at the plasma generated by the first pulse collinearly with said first pulse, said second pulse being of a wavelength substantially longer than the wavelength of said first laser pulse, to enable at least partial absorption of the energy of said second pulse by said plasma and to create an enhanced plasma containing radiation which is representative of a selected component present in said material,d) measuring the intensity of said radiation of said enhanced plasma collinearly with said first laser pulse and said second laser pulse, ande) determining the concentration of said selected component in said material as a function of said intensity of said radiation.

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