Showing papers by "Libera! published in 1997"
TL;DR: The modified phase locked loop (PLL) technique applied to the analysis of 2D carrier-frequency fringe patterns is presented in this paper, which uses two images with a projected grating shifted in phase by half of its period.
Abstract: The modified phase locked loop (PLL) technique applied to the analysis of 2-D carrier-frequency fringe patterns is presented. It uses two images with a projected grating shifted in phase by half of its period. The proposed technique was tested for the mannequin shape determination with good results obtained with two iterations only. Due to the properties of the PLL technique there is no problem with phase unwrapping and very short calculation time is needed.
19 citations
30 May 1997
TL;DR: A fiber optic sensor prototype to detect nitride and nitrate in water is presented in this paper, which is based on a spectrophotometric technique, and makes use of specific chemical reagents.
Abstract: A fiber optic sensor prototype to detect nitride and nitrate in water is presented. Its working principle is based on a spectrophotometric technique, and makes use of specific chemical reagents.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
3 citations
01 Apr 1997
2 citations