MICRO-EPSILON reflectCONTROL RCS, Инструкция по эксплуатации

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Description of the “Evaluation” View
Page 95
6.1.6 “Circular Hole” Measuring Program
Use the “Circular Hole” program to measure a circular hole in a point cloud.
Note: The “Circular Hole” program also requires a reference plane in addition to the point cloud as input
data. This reference plane can be calculated using the “Plane fit” measuring program (see Chap.
6.1.3 ).
Proceed as follows:
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First, if you have not already, insert the “Plane fit” measuring program and configure the measuring
program in order to obtain a reference plane (see Chap.
6.1.3 ). Move the measuring program such
that it comes before the “Circular Hole” program in the list of active measuring programs (see
Chap.
3.14 ).
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Select the input point cloud and the reference plane for the program (see below, section “1” and
Chap.
3.16.3 ).
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Define a ROI for the hole measurement (see below, section “E” and Chap. 3.16.4 and 3.16.5 ).
Make sure that the ROI is as small as possible. You should choose the ROI such that the center
point of the ROI is as close as possible to the expected center point of the hole circle.
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If required, activate the optimized fit and enter a suitable threshold for the optimized fit (see below,
section “2”).
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If necessary, change the edge threshold (see below, section “2”).
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If applicable, select measured values that are to be used later for calculation, OK/nOK assessment,
logging and output (see below, section “H” and Chap.
3.16.8 ).
Note: Unlike other measuring programs, you have to define a ROI in the “Circular Hole” program in order
to obtain valid measurement results.
Note: Unlike other measuring programs, only one ROI can be used in the “Circular Hole” measuring pro-
gram.
The measuring program outputs the following measured values:
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Center x: The X coordinate of the center point of the calculated circle.
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Center y: The Y coordinate of the center point of the calculated circle.
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Center z: The Z coordinate of the center point of the calculated circle.
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Radius: The radius of the calculated circle.
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Number of points: The number of edge points that were used to calculate the circle.
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Sigma: The standard deviation of the distances between the points that were used to calculate the
circle and the calculated circle.
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Peak to Valley (PV): The distance between the two points that are furthest away inwards and out-
wards from the circle, relative to the computed circle. The two points are determined from the
points that were used to calculate the circle.
Note: The edge points are projected onto the reference plane and the projected points are used for com-
puting the circle fit and the distances for sigma and PV.