Polymer optical fiber specklegram strain sensor with extended dynamic range

Author(s)

Fujiwara, Eric ^[1] ; da Silva, Luiz Evaristo ^[2] ; Marques, Thiago H. R. ^[2] ; Cordeiro, Cristiano M. B. ^[2]

Affiliation

^[1] Univ Estadual Campinas, Sch Mech Engn, Lab Photon Mat & Devices, Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Gleb Wataghin Inst Phys, Specialty Opt Fibers & Photon Mat Lab, Campinas, SP - Brazil

• Document type: Journal article
• Source: Optical Engineering; v. 57, n. 11 NOV 2018.
• Web of Science Citations: 4

Abstract

A polymer optical fiber strain sensor with extended dynamic range is reported. The proposed algorithm resets the reference fiber status depending on the magnitude of the specklegram deviation so the correlation coefficient never saturates, yielding a continuous response over the full range for both positive and negative strains. The technique was evaluated on the measurement of axial strains using a ZEONEX core, poly(methyl methacrylate) cladding multimode fiber, presenting reproducible results with 3 x 10(-3) mu epsilon(-1) sensitivity (similar to 15 mu epsilon resolution) within a 22,600 mu epsilon interval. In contrast to the available approaches, the presented method can retrieve the strain direction and does not require intensive image processing, thus providing a simple and reliable technique for mechanical measurements using multimode optical fibers. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE) (AU)

• FAPESP's process: 17/25666-2 - Development of an optical fiber force myography sensor for applications in human-robot interfaces
• Grantee: Eric Fujiwara
• Support type: Regular Research Grants
• FAPESP's process: 14/50632-6 - Surface-plasmon resonance sensors based on microstructured optical fiber
• Grantee: Cristiano Monteiro de Barros Cordeiro
• Support type: Regular Research Grants