Method and apparatus for in-process liquid analysis by laser induced plasma spectroscopy
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United States of America Patent
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May 25, 2004
Grant Date -
Oct 17, 2002
app pub date -
Feb 8, 2001
filing date -
Feb 8, 2001
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Abstract
A method and apparatus for spectrochemical analysis of liquids, including molten metals, using laser-induced plasma spectroscopy. The apparatus preferably comprises a high power pulsed laser focused on the surface of a liquid stream flowing in a measurement cell, and an optical spectrometer-detector assembly, which receives, detects and analyzes the radiation emitted by the high temperature plasma thereby excited. The measurement cell, and optional pump, establish laminar flow of the liquid flow, thereby permitting the laser to repeatedly sample a fresh un-perturbed surface, while also ensuring that bubbles formed in the liquid are removed from the focal volume Preferably, a blower prevents aerosols and matter ejected from the sample responsive to the incident energy from interacting with subsequent laser pulses, and from accumulating on the optic.
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