Non-Contact Surface Roughness Measurement by Implementation of a Spatial Light Modulator
Laura Aulbach1, Félix Salazar Bloise2, Min Lu3
1Institute for Measurement Systems and Sensor Technology, Technische Universität München, Theresienstrasse 90, 80333 Munich, Germany. l.aulbach@tum.de.
Sensors (Basel, Switzerland)
|March 16, 2017
Summary
This study introduces a novel non-contact surface roughness measurement technique using a liquid-crystal spatial light modulator. This method offers a straightforward, extendable solution for online monitoring, overcoming limitations of existing destructive methods.
Area of Science:
- Materials Science
- Metrology
- Optical Engineering
Background:
- Surface roughness significantly impacts technical system performance, influencing parameters like friction and wear.
- Current surface roughness measurement methods often suffer from destructive procedures or lack online monitoring capabilities.
Purpose of the Study:
- To propose and validate a new non-contact method for measuring surface roughness.
- To develop a technique suitable for straightforward implementation and extension to online monitoring.
Main Methods:
- Utilizing a liquid-crystal-based spatial light modulator integrated into an interferometric setup.
- Correlating imprinted phase variations with interferogram fringe visibility to derive surface roughness.
- Comparing experimental results with atomic force microscopy and stylus profilometry.
Main Results:
- Demonstrated a theoretical approach for the novel measurement technique.
- Presented initial simulation and experimental data for various surface roughnesses.
- Validated the method's accuracy against established surface measurement tools.
Conclusions:
- The proposed non-contact method effectively measures surface roughness.
- The technique is practical for integration into online monitoring systems.
- This approach offers an advancement over traditional destructive measurement techniques.
