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Instruction for Operating
optoNCDT 1700
9. Instruction for Operating
9.1 Reflection Factor of the Target Surface
In principle the sensor evaluates the diffuse part of the reflected laser light, see Fig. 46.
Laser beam
Ideal diffuse reflection Real reflecionDirect mirror
reflecion
Laser beam
Laser beam
2
Fig. 46 Reflection factor of the target surface
A statement concerning a minimum reflectance is difficult to make, because even a small diffuse fraction can
be evaluated from highly reflecting surfaces. This is done by determining the intensity of the diffuse reflection
from the CCD array signal in real time and subsequent compensation for intensity fluctuations, see Chap. 3.2.
Dark or shiny objects being measured, e.g. black rubber, may require longer exposure times. The exposure
time is dependent on the measurement frequency and can only be increased by reducing the sensor’s
measurement frequency.
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