Table of Contents
Advertisement
The
measurement
system
is
relatively
insensitive
to
all
other motions
within
limits
which
are
covered
in
greater
detail
in
following
sections.
The
following
brief
summary
of
the
different
types of
motion
(see
Figure
2-3)
is
intended
only
to
familiarize
you
with
their
effect
on
a
mea-
surement
application:
a.
Motion
of
the
receiver
or
laser head
in
a
direction
parallel
to
the
measurement
path
(X)
has
no
effect
on
the
measurement.
b.
Motion
of the
laser
head,
receiver,
interferometer,
or
retroreflector
in
a
direction
lateral
to
the
measurement
path
(Y
or
Z)
has
no
effect
on
the
measurement.
The
only
restriction
is
that
sufficient
light
returns
to the
receiver.
In
general,
the
maximum
allowable
lateral
displacement
is
2.5
mm
(0.1
inch).
Additional
lateral
movement
will
normally
cause
the
laser
beam
to
be
displaced
beyond
the
point
where
sufficient
light
is
returned
to
the
receiver.
Figure
2-3.
Allowable
Component
Motions
c.
Angular
motion
of
the
laser
head
about
the
Z
and
Y
axes
has
two
effects:
1.
Introduces
a
measurement
error
(cosine
error)
which
is
discussed
in
the
section
on
Accuracy
Considerations.
2.
Can
displace
the
laser
beam
enough
so
that
insufficient
light
returns
to
oper-
ate
the
receiver.
NOTE
Angular
motion
of
the
laser
head
about
the
X
axis
is
not
al-
lowed
for
reasons
described
in
the
section
on
Measurement
Components.
d.
Angular
motion
of
the
receiver
about
the
X, Y,
and
Z
axes
has
no
effect
on
the
mea-
surement
within
certain
limits
(refer
to
Measurement
Components).
e.
Angular
motions
of
the
interferometer
and
retroreflector
are
dependent
on
the
partic-
ular
components
and
application.
Refer
to
Measurement
Components
for limitations.
Advertisement
Table of Contents
Troubleshooting
