Polyvinyl alcohol filled negative axicon tip based highly sensitive fiber optic sensor for acetone sensing

• Main Authors: Kumar, Ajay, Pawar, Dnyandeo, Vairagi, Kaushal, Mondal, Samir, Kanawade, Rajesh
• Format: Conference Proceeding
• Language: English
• Subjects: Acetone sensing; Fabry-Perot interferometer (FPI); Fiber optic sensor; Negative axicon; Polyvinyl alcohol (PVA); Swelling
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2020.05.220

In this work, Polyvinyl alcohol (PVA) filled negative axicon tip based Fabry-Perot interferometer (FPI) sensor for acetone detection at room temperature has been proposed and demonstrated. The sensing principle of the fabricated sensor probe is based on the swelling of Fabry-Perot (FP) cavity proportional to the varied concentration of acetone vapors. The swelling results in wavelength shifts and intensity modulation of an interference pattern, attribute to the change in cavity length and change in the refractive index of the FP cavity. The sensitivity of the developed sensor in term of wavelength shift and Extinction Ratio (ER) change for acetone detection were observed of the order of around 8.3 pm/μL/L and 0.012 dBm/μL/L, respectively. The limit of detection (LOD), response and recovery time of the developed sensor were observed of the order of 2.04 μL/L, 30 s and 8 s, respectively. The proposed sensor is simple, miniaturized, cost-effective and highly sensitive to acetone vapors, therefore it could be used to fulfil the demand of industrial applications such as chemicals, plastics, nail polish and paint remover.