The technology progress in mechanics, material science and manufacturing which has been observed over the past decades, has created a great demand for reliable, fast and fully automated inspection methods. Among the optical methods, a very useful tool for in-plane displacement measurement is the grating interferometry [1]. The features of this method are: high sensitivity, versatility and high accuracy of in-plane displacement determination. In order to meet requirements concerning the miniaturisation of the measurement system, the new fibre optic version of the grating interferometer [2] has been proposed. This realisation enables measurement in difficult to access locations which significantly increased the versatility of the system. The novelty of the system is utilisation of laser diode as a light source. Using the spectral properties of the laser diode, especially the possibility of controlled wavelength varying allowed to create a smart fringe design system, which is used for automatic interferogram analysis.

Date Published: 1 September 1996
PDF: 2 pages
Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778F2 (1 September 1996); doi: 10.1117/12.2316231

Published in SPIE Proceedings Vol. 2778:
17th Congress of the International Commission for Optics: Optics for Science and New Technology
Joon-Sung Chang; Jai-Hyung Lee; ChangHee Nam, Editor(s)