User`s manual

Biaxial Displacement Follower User’s Manual Version 1.4, April 19, 2004 IM1013
Page
12
Figure 12
Tracking Prerequisites
Single Axis Tracking, Vertical or Horizontal
The target and its motion should be located in the plane that is perpendicular to the optical axis. For successful lock-on, the
target’s width must be greater than 10% of the full-scale measurement range, and its location must be along the tracking
axis.
Figure 13
The minimum target required for vertical tracking along the vertical tracking axis.
Biaxial Tracking
The width of a biaxial target must be greater than 20% of the full-scale measurement range. In Figure 14, this portion of the
measurement range is twice the diameter of the circle located at the center of the full scale measurement range.