Abstract
This work presents a technique by which a low resolution (≈1 nm)
fiberoptic spectrometer may be used to definitively identify elements and molecular
fragments in laser-induced breakdown spectroscopy. Commercial laser-induced
breakdown spectroscopy (LIBS) spectrometers have high resolution in the area of
spectral interest, and software is used to identify elements via a look-up table
containing known spectral lines. When analyzing spectra from a lower resolution
fiber-optic spectrometer, software based on look-up tables can produce erroneous
results, reporting elements absent from the sample. As a solution to this problem,
an analysis using the coherence function in conjunction with Welch's method is used
to compare sample spectra with a library of reference spectra, which contain peaks
primarily from a single element. The analysis has proved to be adept at identifying
specific elemental signatures in multi-component samples. The technique leverages
the increased information content of concomitant atomic emission lines, which are
easily collected with a low resolution broadband (200–1100 nm)
fiber-optic spectrometer. This technique alleviates the need for the user to
visually verify the vicinity of individual peaks during testing. While Pearson's
method is generally used for this type of analysis, we show that Welch's method has
the advantage of being less susceptible to problems caused by continuum background.
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