Mode
l
5528,4,
Squareness Measurements (
In
a Vertical Plane)
13-14
~
•
~
~
I
Figure 13-9. Two Dots
all
tile Oplical Square
22.
Tr
anslale
the
laser
Head vertica
ll
y and horizonta
ll
y 10 keep the
Laser
beam from being
clipped
by
the alignment ring
on
the Straightne
ss
Relroreflector.
Check this by making s
ure
you can't
see
the beam on the Interferometer surface that
fa
ces
the
Relroreflcctor.
Any translation of
the
La
ser Head
will
cause the
two
dots to move from their position
on
the
Optical Square, so you w
ill
again have to rotale and translate
the
laser Head (i.e .• repeat st
ep
"16"
and step "
17"
several times) before
you
are
done
.
You
are finished wilh t
hi
s pr
ocedure
when the beam goes through the Interferometer
wilhout being clipped, and
the
two
dot
s are
sy
mmetrical about the Optical Square's top slot
(see
Figure 13-9.)
Proce
dure
For Installing the Straightne
ss
Reflector
1.
Se
lect the small
aperture
for
the
exit pori
on
the laser Hcad. f
You
ca
n also
do
this using
the
full
beam from
the
large
aperture
.)
2.
Make s
ure
the
Interferometer bezel's scribed line
is
oriented
90
degrees relative to the s
lot
in
the
Optical Square.
3.
Move
the
Optics to
the
near
end
of
travel.
Po
si
tion
the
Interferometer
as
close
as
yo
u can to
the
Optical Square.
4.
Attach the Reflect
or
10
it
s mounting hardware
as
shown
in
Figure 10-4.
5. Orient
the
Reflector
10
make a ver
ti
ca
l measureme
nt
al
ong
a horizontal
axi
s.
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