Bombing method
This method is used for sealed objects that cannot be
connected
directly to the detector
(semiconductors, waterproof watches, etc.).
He
He
part
par
t
Chamber 1
Chamber
2
detector
The part is
placed
in
a chamber
containing
pressurized helium.
The helium
penetrates
the part if it has
a leak.
The part is then removed from the
chamber
and
placed
in
another
vacuum
chamber
which is
connected
to the detector. The helium
escapes
from the part through the leak and
produces a signal.
This signal is not
a
direct
measurement
of the leak as the helium
pressure inside the part is difficult to
determine.
Several parts play
an
important part such as: the
pressurization
time, the helium
bombing
pressure, the internal volume, the
aeration
time, the size of the
leak.
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