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2.29 SYSTEM INSTALLATION
2.30
Multiple Measurement Axes
As
previously discussed,
the
Laser
Transducer
System
can
measure
up
to
six
independent
axes
of
displacement
using
one
5501A
Laser
Transducer
head.
When
installing
the
laser
head
on
a
machine
of
any
type,
one
of
the
prime
considerations
is
how
to
direct
the
laser
beam
to
the
point
on
the
machine
where
the
measurement
actually
takes
place.
By
using
the
proper
com-
bination
of
beam
splitters,
beam
benders,
and
interferometers,
the
measurement
axes can
be
established
with
a
minimum number
of
components.
The
following
figures
illustrate
several
examples
of
how
the
laser
beam
can
be
routed
for
multiaxis
measurement
configurations.
In Figure 2-32 a three-axis measurement configuration is shown with all components aligned
in one plane. Note that any of the components (beam benders, beam splitters, or interfero-
meters) could be rotated in increments of 90° to provide a three-dimensional configuration.
Since the interferometers can also bend the laser beam through 90°, the number of com-
ponents used can be minimized. A four-axis measurement configuration is shown in Figure
2-33. Again, any of the components can be rotated in 90' increments to direct the measure-
ment axes into or out of the page.
BEAM
BEPlDER
1
LINEAR
INTERFEROMETER
33%
67%
B E A M
SPLITTER
RECEIVER
LINEAR
INTERFEROMETER
Figure
2-32.
Three-Axis Configuration
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