ATS600 SVI Measurements
Surface Vector intersection Measurements
The ATS refectorless measurement capability provides a means to precisely measure a point location on a surface. Vectors normal to that surface can be used to identify exactly where to measure on an actual part regardless of thickness variation. This corrects for a potentially significant shift in the location of the returned point depending on the incidence angle to the part if nominal points on the part are used rather than vectors. SVI (Surface Vector Intersection) measurements provides an auto-measure function which can be used for this type of application.
If you have a CAD model, its very easy to construct a grid of points on a surface using: Points Evenly-Spaced on Mesh Surfaces in UV
Then you can query those points to the CAD to build Vectors normal to the surface.
For settings, go to the Gear Tool (General Settings) in the main tracker interface window, and hit [Leica ATS] button
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Max Expected Part Deviation. Is the size of an initial 3-point search along the reference vector, and at least one of the positions must hit the part.
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Threshold (distance from meas to vector). Defines how close you want the search to get in order to yield a measurement whose distance from the vector is within that threshold.
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Rejection (max distance, meas to vector). Fail the measurement if this threshold is exceeded, and add a report to the Instrument History in SA, identifying the failed point. The addi- tion will help to avoid the condition where the tracker cannot point to the expected intersection point, or along the search vector, and to diagnose it when it does happen.
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Do Stationary Meas at End. By enabling this option the live distance reading still guides to beam to the desired location, but rather than simply sampling the distance a more accurate point measurement is then triggered. This can be set to Fast, Standard or Precise surface point modes.
To initiate this measurement, just go to the SA Instrument menu, and select Instrument>Automatic Measurement > Measure Batch of Vectors
Measurement details will include the “Max Expected Part Deviation” and “Threshold” values used, and the resultant point’s distance from the vector.
Surface Vector Measurements with ATS600 in SpatialAnalyzer -