Cavity length dependence on strain sensitivity for Fabry–Perot sensors
Corresponding Author
António V. Rodrigues
Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Porto, Portugal
Center of Applied Photonics INESC TEC, Porto, Portugal
Engineering Physics Department, Faculty of Engineering of the University of Porto, Porto, Portugal
Correspondence António V. Rodrigues, Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Rua Campo Alegre, s/n, 4169-007 Porto, Portugal.
Email: [email protected]
Search for more papers by this authorJoão Reis
Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Porto, Portugal
Center of Applied Photonics INESC TEC, Porto, Portugal
Search for more papers by this authorAntónio José M. Martins
Institute of Engineering, Polytechnic of Coimbra, Coimbra, Portugal
Search for more papers by this authorCatarina S. Monteiro
Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Porto, Portugal
Center of Applied Photonics INESC TEC, Porto, Portugal
Engineering Physics Department, Faculty of Engineering of the University of Porto, Porto, Portugal
Search for more papers by this authorSusana O. Silva
Center of Applied Photonics INESC TEC, Porto, Portugal
Search for more papers by this authorCristina M. R. Caridade
Institute of Engineering, Polytechnic of Coimbra, Coimbra, Portugal
Search for more papers by this authorSérgio O. Tavares
Center for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, Aveiro, Portugal
Search for more papers by this authorOrlando Frazão
Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Porto, Portugal
Center of Applied Photonics INESC TEC, Porto, Portugal
Search for more papers by this authorCorresponding Author
António V. Rodrigues
Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Porto, Portugal
Center of Applied Photonics INESC TEC, Porto, Portugal
Engineering Physics Department, Faculty of Engineering of the University of Porto, Porto, Portugal
Correspondence António V. Rodrigues, Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Rua Campo Alegre, s/n, 4169-007 Porto, Portugal.
Email: [email protected]
Search for more papers by this authorJoão Reis
Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Porto, Portugal
Center of Applied Photonics INESC TEC, Porto, Portugal
Search for more papers by this authorAntónio José M. Martins
Institute of Engineering, Polytechnic of Coimbra, Coimbra, Portugal
Search for more papers by this authorCatarina S. Monteiro
Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Porto, Portugal
Center of Applied Photonics INESC TEC, Porto, Portugal
Engineering Physics Department, Faculty of Engineering of the University of Porto, Porto, Portugal
Search for more papers by this authorSusana O. Silva
Center of Applied Photonics INESC TEC, Porto, Portugal
Search for more papers by this authorCristina M. R. Caridade
Institute of Engineering, Polytechnic of Coimbra, Coimbra, Portugal
Search for more papers by this authorSérgio O. Tavares
Center for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, Aveiro, Portugal
Search for more papers by this authorOrlando Frazão
Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, Porto, Portugal
Center of Applied Photonics INESC TEC, Porto, Portugal
Search for more papers by this authorAbstract
This study presents the dependence of strain sensitivity on cavity length in conventional Fabry–Perot (F-P) sensors. A high number of F-P sensors were required and to ensure their reproducibility, a manufacturing process was developed to obtain similar sensors but with different types of lengths. A hollow-core silica tube was used to fabricate several F-P cavities by fusion splicing it between two sections of SMF28 fiber. The fabricated F-P has a varying length ranging from 15 to 2500 μm. The cavities were measured under a microscope and the reflected spectrum was acquired for each one. Strain measurements were performed for a maximum strain of 1000 με. The strain sensitivity showed a highly linear correlation with ∆λFSR. Small length variations for short cavities heavily affect the FSR value. The smallest and longest cavities present sensitivities of 8.71 and 2.68 pm/με, respectively. Thermal characterization for low- and high-temperature regimes was also performed and is constant for tested sensors.
Open Research
DATA AVAILABILITY STATEMENT
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.
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