Strain sensing based on a core diameter mismatch structure. Issue 8 (18th March 2019)

• Record Type: Journal Article
• Authors: Fernandes, Cindy S.; Rocco Giraldi, Maria Thereza M.; de Sousa, Marco J.; Costa, João C. W. A.; Rodrigues, Leonardo D.; da Silva, Filipe R. B.; Ferreira, Gabriel F.; dos Reis, Renan A. N.
• Is Part Of: Microwave and optical technology letters. Volume 61:Issue 8(2019:Aug.)
• Page Start: 2013
• Page End: 2019
• Publication Date: 2019-03-18
• Subjects: core diameter mismatch -- optical strain sensor -- single‐mode‐multimode‐single‐mode structure -- structural health monitoring; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.31836
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: In this paper, it is proposed and experimentally investigated a sensor structure based on a core diameter mismatch technique for strain sensing. An uncoated short section of multimode fiber is spliced between two standard single mode fibers forming the sensor structure, called the SMS (single‐mode‐multimode‐single‐mode) sensor. The proposed SMS sensor, in the strain analysis, generates destructive or constructive interference patterns as load or strain are applied, changing the power of the optical signal only, without varying the wavelength. The sensor configuration offers several motivating attributes, such as easy fabrication, low‐cost, high‐efficiency and high sensitivity, moreover allows interrogation of the optical signal using the transmitted or reflected total optical power. The results and these advantages indicate that the proposed SMS sensor device is suitable for strain measurement, which is helpful in a broad range of applications, for instance, structural health monitoring.