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ModelSS28A
Distance
Measurements
ASSEMBLY OF OPTICS
Interferometer Assembly
A Distance measurement is
made
using
two
Retrorefleclors
and one
Inlerferometer.
The Interferometer
is placed in
the path between the laser
Head
and
the
two
Retroreflectors
,
as
shown in Figure 6·3(a).
In
actual practice, one of
the Retroreflectors wi ll be physically
attached
to
the Interferometer
and
the
othcr one
will be
allowed
to move
with
respect to thc
Interferometer.
When
planning
your setup, it is import ani
10
note that
the
"
tai
l"
end
of
one of the
arrows
on the
Interferometer's
label
must be
toward
the
laser Head
,
and
Ihe
"
head
"
of each of
the
arrows
muS(
point toward
a
Relroreflector,
whcthcr attached or
moving.
Whcn the
measurement you want
to makc is
along the
lase
r beam
,
your
Interferometer Assembly
will look
like
Figure 6-3(b).
When
the
measurement you want
to
make is along an axis at
right
angles
to the laser
beam,your
Interferometer
Assembly
wi ll
look like
Figure 6-3(c). Note that each of
the
views
in
Figure 6-3
is
a
side
view.
Attach one
Rctroreflector to the
Interferometer
as
shown
in Figure
6-3(b),
using
the
two
sma
l
l
knurled screws
included with
the
Retroreflector.
In actual practi
ce,
you set
up for
a
measurement
perpendicular
to the
Laser beam the same as shown
in Figure
6-3(b), except you
rotate
the
Interferometer unlillhe
arrows point
In the
directions
you
need
.
(See
Figure
6-9
for
sel-upS for
Distance
measurements
perpendicular to
the
laser
beam
.)
For
the
rest of
this
section, we
will refer to this
assembly of
Interferomeler
and
Relroreflector
as
the
"Interferorneter",
6-5
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