Meaning
Optical interference occurring when a probe beam hits a translucent surface prevents the sensor from identifying the exact point of impact. In precision manufacturing, laser triangulation scattering often leads to false readings of thickness or height. This error mechanism is specific to non-opaque materials where the light penetrates below the surface.
Measurement Accuracy
Errors in height detection arise because the sensor captures a blurred spot rather than a sharp point. When laser triangulation scattering occurs, the calculated position of the surface is shifted deeper into the material. This shift creates a systematic offset that ruins the data.
Optical Interference
Ambient light and material properties combine to degrade the signal to noise ratio of the sensor. Mitigating laser triangulation scattering involves using specific wavelengths that are absorbed quickly by the surface layer.
Calibration Standard
Verification of the sensor performance requires a certified reference block made of a material that does not allow internal light travel. Comparing production results to this block shows the magnitude of laser triangulation scattering in the current setup. Adjusting the power levels of the beam often brings the error back within acceptable bounds.
This calibration is essential for maintaining a high production yield.
