Error Influences; Reflection Factor Of The Surface Of The Target; Color Differences; Temperature Influences - MICRO-EPSILON surfaceCONTROL 3D SC3200-80 Operating Instructions Manual

Operation
6.6

Error Influences

6.6.1

Reflection Factor of the Surface of the Target

The sensor evaluates the diffuse portion of the reflected light. Any statement about a minimum reflection factor is only
possible with reservations. A preliminary examination is necessary to use the sensor on reflective, highly reflective or
transparent objects.
6.6.2

Color Differences

Color differences between test objects result in apparent changes of the surface texture of the test object and thus also
influence the calculation of the 3D data from the acquired images. Therefore color differences can result in increased
measurement inaccuracies and reduced detection performance.
As the exposure parameters can only be changed as a whole, careful matching of the exposure to the target surface is
recommended.
6.6.3

Temperature Influences

When the sensor is commissioned, a warm-up time of at least 60 minutes is required to achieve uniform temperature
distribution in the sensor. Large temperature fluctuations and changes of the ambient climate act directly on the sensor
and its fixing elements and can thus change the detection performance.
6.6.4

External Light

For external light suppression, the sensor is equipped with corresponding filters in front of the camera lenses. They
allow only a narrow (band-limited) wavelength range around the wavelength of the light projected onto the test object. In
general, additional shielding of external light directly emitted on the target or reflected in the sensor is recommended for
highly accurate measurements.
i
Pay particular attention to unwanted reflections of the projected structured light outside the target area (back-
ground, object holder or similar) which can be reflected back again into the view area of the sensor.
i
Matt black surface coatings are recommended for all objects outside the measuring range (object holders,
transport equipment, grippers or similar).
6.6.5

Mechanical Vibrations

As high resolutions in the µm range will be achieved with the inspection system, particular attention must be paid to as
vibration-free a set-up of sensor and test object as possible.
6.6.6

Surface Roughness and Texture

Surface roughnesses of the order of 5 µm and more, as well as textures on the surface, result in increased "surface
noise". In addition, direct reflections of the projected light can also occur on grinding marks or small scratches on the
surface. This can result in inaccurate measured values. Remedy can possibly be provided by adjusting the exposure or
by changing other sensor settings.
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