Meaning
Optical measurement systems project known patterns of light onto a surface to calculate the three-dimensional coordinates of an object. Structured light metrology is widely used in the plastics industry to capture the complex shapes and fine details of moulded components without physical contact. The distortion of the projected stripes as they fall on the part is recorded by cameras and converted into a digital mesh.
Data Acquisition
Rapid capture of millions of data points allows for a comprehensive inspection of the entire surface area in seconds. Unlike traditional touch probes, structured light metrology can detect small-scale deviations like sink marks or textures that are hard to measure manually. This full-field data is then compared to the CAD model to identify any warpage or shrinkage issues.
Processing Speed
High-speed sensors and powerful software enable the inspection of parts directly on the shop floor. Integrating structured light metrology into the production cycle allows for faster troubleshooting of the moulding process. This technology reduces the time needed for a first article inspection and improves the feedback loop for tool adjustments.
Accuracy Limit
Surface finish and transparency can affect the quality of the light reflection and the resulting data. Specialized sprays are sometimes used to create a matte finish on shiny polymer parts before the scan begins. This preparation ensures that the sensor captures a complete and accurate cloud of points for analysis.
