Research On Key Technologies Of Measurement Of Surface Roughness By Optical Probe System

Ever-improving process quality of surfaces demands high level techniques of surface roughness. Traditional contact profilers feature excellent measuring stability, reliability, but they may damage the surfaces. We design the measurement system of surface roughness based on optic fiber sensor, which overcomes the drawback existing in contact profilers and is simple.This paper presents the key technology of measuring surface roughness based on optic fiber sensor. We applied this method into a practical measurement system, which can give parameters of surface roughness and the profile outline of a measured surface by detecting optic signal modified by surface profile. After being transformed into electronic, amplified and filtered, the signal is sampled by a computer. Process-control of measuring, data processing and the display of the measurement results are all completed by the computer. We design a virtual instruments by the graphical programming language Labview, and apply it to the measure of surface roughness. The measurement system's main merits are simple, fast and precise.After giving several basic concepts and parameters of surface roughness, the paper discusses emphatically the principle of this new technology, the method of sampling frequency and the technology of data processing. Then in this paper, de-noising using wavelet transform, computation of the profile outline's midline, peak detection, interpolation and the calculation of each roughness parameter are presented detailed. At last, the experimental result and the analysis of result are given and the further research work is expected.