Page 450 - Sensors and Control Systems in Manufacturing
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FIGURE 8.21 The large surface being measured should change its dimension
perpendicular to the surface.
FIGURE 8.22 Sensitivity to dimension changes.
8.9.3 Sensitivity of Measurements
The sensitivity of the measurements to dimension changes is five or
ten times greater when the change is in the same direction as the
emitted sound wave (Fig. 8.22).
8.9.4 Small Surfaces
Small surfaces can be measured as long as the robot end effector car-
rying the sensor array directs the sound wave from the side of the
object (Fig. 8.23). Small surfaces are either a small portion of a large
object or simply the surface of a small object (Fig. 8.24).
FIGURE 8.23 Small surfaces.
