Meaning
Dimensional inspection techniques that collect surface data without physically touching the workpiece utilize optical, laser, or X-ray sensors. This approach is called non-contact measurement, which governs the acquisition of point clouds and 3D surface scans. The method does not apply to mechanical dial gauges or touch-trigger coordinate measuring machines.
Sensor Technology
Optical and laser scanners collect millions of data points from the surface of a part in seconds. By adopting non-contact measurement, a quality department can quickly analyze complex geometries that would take hours to check with a physical probe. This speed makes the technology ideal for inspect-on-the-fly systems installed directly on high-speed production lines.
The resulting data provides a dense map of the part’s shape and highlights any deviations from the original CAD model immediately.
Material Suitability
Flexible, soft, or highly polished materials are difficult to measure with physical contact probes. Using non-contact measurement prevents the deformation of rubber seals or thin-walled plastic parts during the inspection process. It also avoids leaving scratches on sensitive optical lenses or polished metal surfaces.
This capability makes it the only viable option for inspecting delicate or pliable components.
Process Integration
Integrating automated optical scanners into the production cell allows for real-time adjustments to the manufacturing machinery. When non-contact measurement reveals a drift in part dimensions, the control system can automatically adjust the mold temperature or injection speed. This rapid feedback loop prevents the production of scrap by correcting the process before the parts exceed the tolerance limits.
