GOM ARAMIS - Defined Measuring Volumes

Choose the measuring volume such that the measuring object fills the
entire image as best as possible at the correct measuring distance in the
measuring area.
You choose a measuring volume depending on your measuring task.
Important factors are the size of the specimen and the space available for
the measuring setup. The chosen measuring volume defines the distance
of the sensor to the specimen, the slider distance and the required num‐
ber of sets of camera lenses. You can work with dierent measuring dis‐
tances on an existing camera support by changing the sets of lenses on
the camera. Thus, you can measure objects with dierent sizes at dierent
distances.
Info
GOM recommends to comply with the given camera angle of 25°.
For many applications, defined measuring volumes with preadjusted cam‐
era lenses are available (see 4.4.1 Defined Measuring Volumes).
You can adjust a used measuring volume individually to your measuring
task by the choice of the camera lenses and the variation of the slider dis‐
tance.
For the available camera lenses, you find further sample configurations in
the table in 4.4.2 Further Configuration Examples.
Furthermore, you can set up individual measuring volumes. Interpolate
the setting values for slider and measuring distance, if necessary.
Focal length of the lens, slider distance, measuring distance and size of the
measuring volume depend directly on each other.
•
At the same measuring distance, dierent camera lenses result in dif‐
ferent measuring volumes.
•
With the same measuring volume, dierent camera lenses result in dif‐
ferent measuring distances.
•
With the same camera lenses, a change of the slider distance results in
a change of the measuring distance and the measuring volume size.
The aperture adjustment and the depth of field depend also on each
other. Camera lenses with a large focal length need a smaller aperture
(large aperture value) to get an equivalent depth of field as camera lenses
with a small focal length.
In general, the following applies: The smaller the aperture (large aperture
value), the larger is the depth of field.
With a small aperture, the camera chip receives less light. Then, the images
are possibly not exposed suciently. The contrast in the images, which is
required for the evaluation, is missing. Additional light sources or longer
exposure times (limited by the sample rate) can correct this.
4.4.1 Defined Measuring Volumes
In the following table Tab. 2, recommended sensor configurations are lis‐
ted.
System Overview
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