Measurement Principle - Roland R1000 Series Manual

System description
3.1

Measurement principle

The function of the Double Sheet Detector is based on the principle of laser triangulation. The
sensor system consists of two sensors which measure the distance.
If the total distance is known it is possible to calculate the sheet thickness.
A
A x
B
Fig. 2: Measurement principle
3.1.1 Planning information for mechanics
The total distance Ax of both sensors from each other has a great influence on the measurement
precision.
Possible determining factors are also:
1. Thermal expansion
2. Vibrations
3. Impacts, press travel
4. Force and torque effects
These factors must be considered sufficiently when dimensioning the mechanics and the sensor
mounting. Permissible deviations Delta Ax must be smaller than 1/6 of the smallest thickness D
to be measured.
Example: For a reliable monitoring of sheets for double sheet detection with a nominal thickness of
0.3 mm, the permissible deviation Delta Ax is:
+/- 0.3 mm / 6 = +/- 0.05 mm.
12
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Double Sheet Control System R1000 series L20
with integrated fieldbus interface
D= A
Important
An appropriate stable and rigid mechanism is
Manual
D
-(A+B)
x
B0063191 / 1.3
required.
min