Difference between revisions of "End-Scan Using End Targets"
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| + | * To use the target, aim the laser at the target so that it strikes the target as perpendicular to the surface as possible. Avoid returning any points other than the target. | ||
| + | * Hold the laser as still as possible when collecting this stripe across the target. | ||
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| + | [[image:EndScanAfterTarget.jpg|300px]] | ||
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| + | [[image:EndWithTargetAndLaser.jpg|300px]] | ||
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Revision as of 21:58, 27 January 2012
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Why the End-Scan technique is important
The quick End-Scan Using the Scissor Motion technique is not always precisely repeatable if you use any of the AUTO exposure settings to set the LASER exposure in real-time. The reason is that as he laser drops off the end of the tube, the automatic exposure feature impacts which of the points are kept where the tube drops off (at the end).
The solution to this issue is to use the End-Scan Using the End Wall technique - which works well for tubes that have end-walls that are easy to aim at - AND end-walls that are not highly reflective with deformations like burrs.
For tubes that don't qualify for either of the above techniques, we recommend end targets for ultra-precise measurements.
How the End-Scan technique works
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The solution is to use white targets on the end of the tubes. The example here shows white poly labels that measure at 0.004" thick and provide an excellent flat target for the laser.
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