Product description
22 © SICK AG · Division Auto Ident · Germany · Subject to change without notice 8013796/UL20/2010-09-27
Operating Instructions
Laser Measurement Systems of the LMS500 Product Family
Chapter 3
3.5.2 Beam diameter and distance between measured points
With increasing distance from the LMS the laser beam of the LMS increases in size. As a
result the diameter of the measured point on the surface of the object increases.
The distance-dependent diameter of the measured point is the distance (mm) × 0.0046 rad
(
HR) or 0.011 rad (SR) +
13 m
m.
Fig. 11: Beam expansion
With increasing distance from the LMS, the distance between the individual measured
points also increases. The distance between the measured points is also dependent on the
angular resolution configured. With a coarser resolution, the distance is larger, with a finer
resolution the distance is smaller. The distance-dependent spacing between the measured
points is the tangent of the angular resolution × distance
Fig. 12: Schematic layout of the distance between measured points at different angular
resolutions
The diagram in Fig. 13 shows the beam diameter and the measured point spacing as a
function of the distance from the LMS.
Important The beam diameter is always greater than the measured point spacing. As a result full
scanning without gaps is ensured.
Optical axis
Expanding laser beam
Beam diameter at the front
screen = 13 mm (0.51 in)
Scan with higher
angular resolution
Scan with lower
angular resolution
Measured point
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