23
Horizontal
The Lasercheck is also sensitive to horizontal misalignment on curved surfaces.
When you look under the Lasercheck from the “laser” end of the head, you will be able to see where the
light is reflected after hitting the surface. If it is correctly aligned, you will see the reflected and scattered
light bouncing back into the center of the detector window. If it is misaligned, you will see the light
bouncing to one side or the other of the center of the detector window.
Figure 8 Lateral offset of the specular reflected laser beam on a ,isaligned curved surface
Figure 8 demonstrates horizontal misalignment because the laser beam and scatter does not reflect back into
the center of the head where the sensors are positioned. When a cylindrical surface is perfectly horizontally
aligned, all laser reflection is back into the centerline of the Lasercheck head.
Directional / Rotational
Many man made surfaces have a dominant direction of roughness. Strong directional roughness produces a
strong directional scatter pattern or “line” of scatter across the direction of roughness. The length of the
Lasercheck head must be oriented perpendicular to the direction of roughness so that the scatter strikes the
detectors, which are oriented in a line down the middle of the head.
If Lasercheck is not aligned at right angles to grinding groves on a ground surface for example (or straight
along the length of a cylindrical barrel) then the “line” of scattered light will not perfectly fall on the
detectors in Lasercheck. Well-designed mounting hardware will eliminate this potential problem.
CYLINDRICAL SURFACE OUT OF
ALIGNMENT
LASERCHECK END VIEW
SPECULAR
BEAM
CYLINDRICAL SURFACE IN
ALIGNMENT
LASERCHECK END VIEW
SPECULAR
BEAM
