Page 162 - Sensors and Control Systems in Manufacturing

FIGURE 2.120 Classification and Types of Sensors 123
Displacement of FIGURE 2.121 Measurement of thickness of
printer impact pins. connecting rod.

• Measurement of height of radiator fin. Detects improper radia-
tor fin height by comparing the bottom value of the analog
output with a stored pair of tolerances (Fig. 2.123).
• Measurement of outer diameter of engine valve. The laser scan
micrometer allows on-line measurement of the outer diame-
ter of engine valves simply by positioning a separate sensor
head on either side of the conveyer (Fig. 2.124).
• Positioning of robot arm. The laser displacement sensor is used
to maintain a specific distance between the robot arm and tar-
get. The sensor outputs a plus or minus voltage if the distance
becomes greater or less, respectively, than the 100-mm refer-
ence distance (Fig. 2.125).

FIGURE 2.122
Measurement of
depth of valve
recesses in piston
head.