Analysis of viscoelastic properties influence on strain and temperature responses of Fabry-Perot cavities based on UV-curable resins. (December 2019)

• Record Type: Journal Article
• Authors: Leal-Junior, Arnaldo G.; Díaz, Camilo R.; Marques, Carlos; Frizera, Anselmo; Pontes, Maria José
• Is Part Of: Optics & laser technology. Volume 120(2019)
• Publication Date: 2019-12
• Subjects: Optical fiber sensors -- Fabry-Perot interferometers -- Viscoelasticity -- Curable resins -- Uniaxial strain -- Temperature; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2019.105743
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Strain and temperature analysis on FPIs with cavities based on viscoelastic materials. UV-curable optical adhesives were analyzed as the viscoelastic material in the cavities. Characterization of the material properties influence on sensor's response time. Strain and temperature sensitivities as function of the resin's material properties. Guidelines for the viscoelastic material used on the FPI cavity for each application. Abstract: This paper presents the analysis of Fabry-Perot interferometers (FPIs) with cavities based on viscoelastic materials, where the influence of the viscoelastic properties of the materials are analyzed as function of temperature, uniaxial strain and the simultaneous variation of both parameters. In this case, the FPI is fabricated with ultraviolet (UV)-curable resins on the cavity between two single mode fibers (SMFs). The sensors are theoretically analyzed, where the influence of the resins' viscosity on the sensor's response time is addressed. In addition, experimental analyses are performed in order to evaluate the influence of the materials Young's modulus and viscosity as a function of the sensors' responses to strain and temperature. Results show a lower response time for the sensors based on resins with higher viscosity, whereas the higher viscosity in conjunction with a lower Young's modulus resulted on the highest strain sensitivity. Furthermore, such combination of high viscosity and low Young's modulus also results in higher temperature cross-sensitivity. Thus, there is a tradeoff between the viscoelastic features of the FPI cavities materials and their sensor performance. To that extent, this paper provides guidelines for the choice of suitable material on the FPI cavity for different applications.