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Photorefractive sensor for measuring mechanical vibration in 2D

Grant number: 16/00785-6
Support type:Regular Research Grants
Duration: June 01, 2016 - November 30, 2018
Field of knowledge:Physical Sciences and Mathematics - Physics
Principal Investigator:Ivan de Oliveira
Grantee:Ivan de Oliveira
Home Institution: Faculdade de Tecnologia (FT). Universidade Estadual de Campinas (UNICAMP). Limeira , SP, Brazil

Abstract

The holographic interferometry (HI) for measuring mechanical vibration in 2D, using photorefractive crystals as optical sensors \cite{Huignard:77AO,bruno:96deformation,Frejlich:00OLEadva,Liou:07OEXP} is very interesting for the measurement of mechanical vibration and deformation in 2D. The usage of photorefractive crystals as sensors allow the use of the same experimental setup for both types of measurement, taking the advantage of the relatively slow response time of some photorefractive materials. For the vibration measurement we use the variation of ``Time-Average Holographic Interferometry'' (TAHI) while for deformation measurement we use the variation ``Holographic Double-Exposure Interferometry'' (HDEI). The HI technique and the two mentioned variants are well known and described in the literature \cite{Magnusson:87,Dirksen:94JOSAB,Sefel:11AOP} but the kit is complex, expensive, inflexible and requires skilled people to manage it. For these reasons, the digital holographic technique was chosen instead of the HI technique. The primary aim of this project is to put together the information we already have about the subject and make use of our experience with the photorefractive materials, to develop a simpler, more efficient and cheaper experimental setup to use it in the industry. This project is an extension of another (closed) international cooperation project, (The International Cooperation Project CAPES-WBI) between Laboratório de Óptica do IFGW da Universidade Estadual de Campinas/UNICAMP, Faculdade de Tecnologia and the Centre Spatial de Liège da Université de Liège-Belgium, where I realized an internship research for 6 months with funding by FAPESP (Proc:2014/06283-7). It is important to emphasize that the present project is for the acquisition of some pieces of equipment that will be used to improve the preliminary results. (AU)