Title :
Optical signal processing for shape measurement
Author :
Lim, Jiunn Hsuh ; Ratnam, Mani Maran
Author_Institution :
Sch. of Ind. Technol., Univ. Sains Malaysia, Penang, Malaysia
Abstract :
A set of optical signal data generated by shadow moire interferometry represents the profile of the surface that is under investigation. An existing algorithm has been used to process and visualize the optical signal into the three dimensional surface plot and a two-dimensional representation for a cantilever. This algorithm was tested and calibrated by measuring a cylinder surface profile and comparing the result with the actual measurement. An error analysis shows that distortion of the imaging system and the uncollimated light source are two major factors that may contribute to error in the analysis. Finally, an experiment was carried out to measure the deflection of a cantilever and the result is compared with the shape obtained from deflection theory
Keywords :
image processing; light interferometry; moire fringes; optical information processing; shape measurement; 2D cantilever representation; 3D surface plot; cantilever deflection; cylinder surface profile; digital fringe pattern measurement; image processing; optical signal processing; shadow moire interferometry; shape measurement; three dimensional surface plot; two-dimensional cantilever representation; Data visualization; Distortion measurement; Error analysis; Optical distortion; Optical interferometry; Optical signal processing; Shape measurement; Signal generators; Signal processing; Signal processing algorithms;
Conference_Titel :
Signal Processing and its Applications, Sixth International, Symposium on. 2001
Conference_Location :
Kuala Lumpur
Print_ISBN :
0-7803-6703-0
DOI :
10.1109/ISSPA.2001.950178
