Soares, LilianaPérez Herrera, Rosa AnaNovais, SusanaFerreira, AntónioFrazão, OrlandoSilva, Susana2023-10-172023Soares, L., Perez-Herrera, R. A., Novais, S., Ferreira, A., Frazão, O., & Silva, S. (2023). Paracetamol concentration-sensing scheme based on a linear cavity fiber laser configuration. Optical Fiber Technology, 80, 103407. https://doi.org/10.1016/j.yofte.2023.1034071068-520010.1016/j.yofte.2023.103407https://academica-e.unavarra.es/handle/2454/46531A paracetamol concentration-sensing scheme based on a linear cavity fiber laser configuration is demonstrated experimentally. The laser cavity has a fiber sensor at one end, that allows refractive index measurements. The refractometer consists of a cleaved fiber tip combined with an FBG functioning as a reflecting mirror. The combination of a fiber loop mirror at the other end allows to reflect all the light from the FBG and refractometer, forming a linear cavity. By measuring the intensity variation of the Fresnel reflection at the fiber-to-liquid interface, the measured concentration is linear and have a concentration sensitivity of -8.74±0.34×10-5 µW/(g/kg), over a range of 52.61 to 219.25 g/kg, and with a resolution of 2.77 g/kg. The results obtained present high stability and prove the potential of the fiber laser system to performed real-time measurements of concentration, in a non-invasive way.application/pdfeng© 2023 Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0ConcentrationFiber laserFiber tipLinear cavityParacetamolinfo:eu-repo/semantics/article2023-10-17info:eu-repo/semantics/openAccess