Flexible wearable optical sensor based on a balloon-like interferometer to breathing monitoring
A flexible wearable sensor utilizing a balloon-shaped interferometer structure, created from a bent standard single-mode fiber and a 3D-printed piece, was introduced and shown for respiratory monitoring. The interferometer is a compact, cost-effective, and easily fabricated sensor. The fiber’s curvature causes interference between the core and cladding modes, which in turn results in the sensor operation. In the balloon-shaped curving section, light traversing the core partially escapes and interacts with the cladding. The preliminary results demonstrate an average displacement of 9.3 nm and the capability to evaluate breathing rate.
Authors
- Paulo Caldas (ORCID: https://orcid.org/0000-0002-3223-9783)
- J. L. Santos (ORCID: https://orcid.org/0000-0002-0818-4268)
- Mónica M. Costa (ORCID: https://orcid.org/0000-0002-3030-7789)
- João C. W. A. Costa (ORCID: https://orcid.org/0000-0003-4482-6886)
- Victor H. R. Cardoso (ORCID: https://orcid.org/0000-0003-4218-0292)
- Orlando Frazão (ORCID: https://orcid.org/0000-0001-7680-1056)
- Maria Thereza Miranda Rocco Giraldi (ORCID: https://orcid.org/0000-0001-8066-6395)
- Marina F. Souza
Institutions
- Universidade do Porto (PT)
- Universidade Politécnica de Viana do Castelo (PT)
- Military Institute of Engineering (BR)
- INESC TEC (PT)
- Universidade Federal do Pará (BR)
Publication Details
- Published
- 2025-05-22
- DOI
- https://doi.org/10.1117/12.3062178
- Primary Topic
- Advanced Fiber Optic Sensors
- Type
- article
- Field-Weighted Citation Impact
- 0.00