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imaging S-APPL
. O
Melt B-MATE
pool E-MATE
undergoes O
different O
melt S-CONPRI
regimes O
and O
exhibits O
orders-of-magnitude O
volume S-CONPRI
change O
under O
a O
constant O
input O
energy B-PARA
density E-PARA
. O
Laser S-ENAT
absorption S-CONPRI
variation O
under O
constant O
input O
energy B-PARA
density E-PARA
is O
an O
important O
cause O
of O
melt B-MATE
pool E-MATE
variation O
. O
Laser S-ENAT
absorption S-CONPRI
variation O
stems O
from O
the O
separate O
effects O
of O
laser B-PARA
power E-PARA
and O
scan B-PARA
speed E-PARA
on O
depression O
zone O
development O
. O
Size O
and O
shape O
of O
a O
melt B-MATE
pool E-MATE
play O
a O
critical O
role O
in O
determining O
the O
microstructure S-CONPRI
in O
additively B-MANP
manufactured E-MANP
metals O
. O
However O
, O
it O
is O
very O
challenging O
to O
directly O
characterize O
the O
size O
and O
shape O
of O