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In
many
applications
where
the
Laser
Transducer
is
installed,
the
only
moving
components
are
the
interferometer
and
retroreflector.
Many
of
the
beam
splitters
and
beam benders
are
mounted
in
a
stationary
manner
and
only
direct
the
laser
beam
to
the
measurement
axes. In
these
cases
it
is
only
necessary
to
provide
fixed
tubing
for
the
laser
beam
and
some
type of
sealed
enclosures
for
the
optics.
Since
only
one
laser
beam
of
approximately
7
mm
(0.3
inch)
is
involved, relatively
small diameter
tubing
can
be
used.
Electric
cable
conduit
for
the
laser
beam
and
electrical
junction
boxes
have
proved
successful
for
this type
of
protection.
Since
either
the
interferometer
or
the
retroreflector
is
moved
during
the
measurement,
pro-
tecting
the
laser
beam
and
the
moving
components
requires
some
type
of
telescoping
cover
or
a
cover
of
the
type
that
is
self-sealing.
There
are
a
wide
variety
of
commercially
available
, - -
7%
.:protective
covers
which
are
suitable
for
this
purpose.
Figure
2-47
illustrates
techniques
for
protecting
the
laser
beam
and
optical
components
with
different
types
of
protective
covering.
Note
that
the
cover
for
the
retroreflector
allows
the
retroreflector
to
be
moved
very
close
to
the
interferometer.
This
helps
minimize
the
deadpath
errors
previously
discussed.
L
FIXED
CONDUIT
FOR
LASER
BEAM
FLEXIBLE
S U L
PROTECTIVE
COVER
NO
OREFLECTOR
B
Figure
2-47.
Protective
Covers
for
Optics
and
Laser
Beam
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