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Chapter 11 Diagonal Measurements
Basics
elevation angle is 0 degrees. When the elevation angle has crossed
through either 90 or 0 degrees, the measurement configuration has
changed; see Figures 11-5 through 11-7.
•
When using the adjustable triangle for alignment, you can use
secondary references as required. For example, if the azimuth angle is
less than 45 degrees, you can use the Y-axis as the reference. (See
Figure 11-26.)
•
In general, aligning the laser beam for a body diagonal measurement
is the same as aligning the beam for any other linear (distance)
measurement, except—you have one more optical element, and the
diagonal path doesn't provide a reference surface that allows you to
use true square for initial autoreflection alignment before placing the
measurement optics. Thus, you must move the optics on the machine
along the diagonal path to achieve final alignment.
•
A pair of body diagonals is contained in a single vertical plane. The
four body diagonals are contained in a pair of intersecting vertical
planes.
•
The laser beam must be aligned in the vertical plane containing the
body diagonal(s) you are measuring (or in a plan parallel to it).
•
The interferometer and beam steering assembly may be at either end
of a diagonal path.
•
The laser head may be to the left or right of the interferometer, when
viewed from the side.
•
Measurements and measurement setups in this chapter are identified
in terms of the end points of the diagonal involved. The first term
identifies the interferometer's position, the second term identifies the
measurement retroreflector's position at the opposite end of the
diagonal. "Near" and "far," refer to end points of the body diagonals in
relation to the laser head's physical position. "Low" and "high" refer to
the end points of a body diagonal in relation to each other.
Measurements Reference Guide
11-43
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