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Title: Method for improving instrument response

Abstract

This invention pertains generally to a method for improving the accuracy of particle analysis under conditions of discrete particle loading and particularly to a method for improving signal-to-noise ratio and instrument response in laser spark spectroscopic analysis of particulate emissions. Under conditions of low particle density loading (particles/m{sup 3}) resulting from low overall metal concentrations and/or large particle size uniform sampling can not be guaranteed. The present invention discloses a technique for separating laser sparks that arise from sample particles from those that do not; that is, a process for systematically ``gating'' the instrument response arising from ``sampled'' particles from those responses which do not, is disclosed as a solution to his problem. The disclosed approach is based on random sampling combined with a conditional analysis of each pulse. A threshold value is determined for the ratio of the intensity of a spectral line for a given element to a baseline region. If the threshold value is exceeded, the pulse is classified as a ``hit'' and that data is collected and an average spectrum is generated from an arithmetic average of hits. The true metal concentration is determined from the averaged spectrum.

Publication Date:
Sponsoring Org.:
US Department of Energy
OSTI Identifier:
20050812
Alternate Identifier(s):
OSTI ID: 20050812
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 9 May 2000
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; LASER SPECTROSCOPY; METALS; AEROSOLS; AIR POLLUTION MONITORING; SIGNAL-TO-NOISE RATIO; SIGNAL CONDITIONING; DATA ANALYSIS

Citation Formats

NONE. Method for improving instrument response. United States: N. p., 2000. Web.
NONE. Method for improving instrument response. United States.
NONE. Tue . "Method for improving instrument response". United States.
@article{osti_20050812,
title = {Method for improving instrument response},
author = {NONE},
abstractNote = {This invention pertains generally to a method for improving the accuracy of particle analysis under conditions of discrete particle loading and particularly to a method for improving signal-to-noise ratio and instrument response in laser spark spectroscopic analysis of particulate emissions. Under conditions of low particle density loading (particles/m{sup 3}) resulting from low overall metal concentrations and/or large particle size uniform sampling can not be guaranteed. The present invention discloses a technique for separating laser sparks that arise from sample particles from those that do not; that is, a process for systematically ``gating'' the instrument response arising from ``sampled'' particles from those responses which do not, is disclosed as a solution to his problem. The disclosed approach is based on random sampling combined with a conditional analysis of each pulse. A threshold value is determined for the ratio of the intensity of a spectral line for a given element to a baseline region. If the threshold value is exceeded, the pulse is classified as a ``hit'' and that data is collected and an average spectrum is generated from an arithmetic average of hits. The true metal concentration is determined from the averaged spectrum.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}