Optical Roughness Measurement
Optical roughness measurement is a non-contact topography measurement that checks surface quality. It prevents surface irregularities from affecting crack detection.
Physical-Chemical Mechanism of Action
Optical roughness measurement uses lasers or light waves to analyze the surface of a material. It measures height differences and irregularities on the surface without physical contact.
Metallurgical Relevance & Welding Risks
On poor surfaces, optical roughness measurement can give false results because it may interpret surface irregularities as cracks. This leads to inaccurate test results and can cause errors in the welding procedure.
Shop Practice & Instructions
Use optical roughness measurement before non-destructive testing to make sure the surface is clean and free of irregular structures. Do the measurement in a cold environment to minimize thermal effects. The accurate measurement should be within the specified tolerances to ensure reliable results.