Glossary
Getting Started Guide G-5
Glossary
time constant—A measure of the time required for a physical system to
move from one equilibrium state to another. In each time constant, the
system moves about 63 percent (1 - 1/e) of the remaining distance between
its present state and the new equilibrium state. After five time constants,
the system is essentially at the new equilibrium state.
translation (of the laser head)—Linear movement of the laser head
without changing its angle (tilt) to direct the laser beam as required for
your measurement.
wavelength-of-light (WOL) compensation—Correction for the small
changes in the wavelength of light due to changes in the refractive index
of air.
WOL—Wavelength of light.
yaw—Rotation about a vertical axis (see Figure G-1).
VDI—Verein Deutscher Ingenieure, a German engineering standard.
Figure G-1. Six degrees of freedom
1
Pitch
2 Yaw
3 Roll
4 Horizontal straightness
5 Vertical straightness
6 Linear displacement
1
23 4 5
6
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