Intensity and contrast based surface roughness measurement approaches for rough and shiny surfaces

• Main Authors: Prabhathan, P., Song, Chaolong, Haridas, Aswin, Prasad, Guru, Chan, Kelvin
• Other Authors: Asundi, Anand K.
• Format: Article
• Language: English
• Published: 2019
• Subjects: Spectral Speckle Correlation; Surface Roughness; Engineering::Mechanical engineering
• Online Access: https://hdl.handle.net/10356/106789; http://hdl.handle.net/10220/49656
• Institution: Nanyang Technological University

In manufacturing engineering the surface finish of a machined component is of fundamental importance in order to ensure its performance. A non-contact and non-destructive device based on optical technique, is a promising alternative to stylus based device for carrying out measurement of surface quality. In addition to this, in situ monitoring of surface roughness on a workpiece is an important requirement in modern machining process, since it would increase on-line machining rate and consequently productivity. Here, measurement approaches and system configuration for surface roughness measurement using laser speckle intensity and contrast are discussed. The technique would allow full-field measurement over sample of interest having both rough and shiny surface properties. Measurement data on standard calibration plates is presented with details on the measurement accuracy and reliability.