Method and apparatus for spectroscopic analysis of heterogeneous

Details Method and apparatus for spectroscopic analysis of heterogeneous Method and apparatus for spectroscopic analysis of heterogeneous

1998-07-01

1999-12-28

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

G01N 2163

Patent

active

060088966

ABSTRACT:
A method and apparatus for rapid in-situ spectroscopic analysis of unknown heterogeneous materials is disclosed. The apparatus uses a high power pulsed laser whose beam is focused on the material, typically a porous compound of unknown composition such as an amalgamated powder or a mineral sample. The pulsed laser beam vaporizes a small volume of the material and produces a plasma having an elemental composition which is representative of the material composition. The optical emission of the plasma is analyzed with an optical spectrometer. The pulsed spectrum is detected by a gated photodiode array detector or by an array of individually positioned photomultipliers, to detect a background emission and a line emission representative of a given element present in the material. Because such measurements may fluctuate considerably for porous materials due to unpredictable variations of the plasma temperature and the amount of vaporized mass, the signals are normalized by establishing a ratio of the intensity of the signals to that of the background plasma emission.

REFERENCES:
patent: 3901599 (1975-08-01), Meric
patent: 4645342 (1987-02-01), Tanimoto et al.
patent: 4986658 (1991-01-01), Kim
patent: 4995723 (1991-02-01), Carlhoff et al.
patent: 5042947 (1991-08-01), Potzchke et al.
patent: 5379103 (1995-01-01), Zigler
Correction of Matrix Effects in Quantitative . . . Journal of Analytical Atomic Spectrometry Feb. 97 vol. 12 (1983-188).

Affiliated with

Also associated with

Rating

Method and apparatus for spectroscopic analysis of heterogeneous does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for spectroscopic analysis of heterogeneous, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for spectroscopic analysis of heterogeneous will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2386190