Abstract
An experimental study of ultraviolet (UV) laser-induced plasma spectroscopy
(LIPS) on Ti samples with low-pressure surrounding He gas has been carried out to
demonstrate its applicability to quantitative micro-analysis of deuterium impurities
in titanium without the spectral interference from the ubiquitous surface water.
This was achieved by adopting the optimal experimental condition ascertained in this
study, which is specified by 5 mJ laser energy, 10 Torr helium pressure, and 1–50 l
μs measurement window, which resulted in consistent D emission enhancement and
effective elimination of spectral interference from surface water. As a result, a
linear calibration line exhibiting a zero intercept was obtained from Ti samples
doped with various D impurity concentrations. An additional measurement also yielded
a detection limit of about 40 ppm for D impurity, well below the acceptable
threshold of damaging H concentration in Ti and its alloys. Each of these
measurements was found to produce a crater size of only 25 μm in diameter, and they
may therefore qualify as nondestructive measurements. The result of this study has
therefore paved the way for conducting further experiments with hydrogen-doped Ti
samples and the technical implementation of quantitative micro-analysis of
detrimental hydrogen impurity in Ti metal and its alloys, which is the ultimate goal
of this study.
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