Abstract
We designed simply fabricated, highly sensitive, and cost-effective dual-polymer-coated Fabry–Perot interferometer (DFPI)-based temperature sensors by employing thermosensitive polymers and non-thermosensitive polymers, as well as different two successive dip-coating techniques (stepwise dip coating and polymer mixture coating). Seven sensors were fabricated using different polymer combinations for performance optimization. The experiments demonstrated that the stepwise dip-coated dual thermosensitive polymer sensors exhibited the highest sensitivity (2142.5 pm °C−1 for poly(methyl methacrylate)-polycarbonate (PMMA_PC) and 785.5 pm °C−1 for poly(methyl methacrylate)- polystyrene (PMMA_PS)). Conversely, the polymer-mixture-coated sensors yielded low sensitivities (339.5 pm °C−1 for the poly(methyl methacrylate)-polycarbonate mixture (PMMA_PC mixture) and 233.5 pm °C−1 for the poly(methyl methacrylate)-polystyrene mixture (PMMA_PS mixture). Thus, the coating method, polymer selection, and thin air-bubble-free coating are crucial for high-sensitivity DFPI-based sensors. Furthermore, the DFPI-based sensors yielded stable readouts, based on three measurements. Our comprehensive results confirm the effectiveness, reproducibility, stability, fast response, feasibility, and accuracy of temperature measurements using the proposed sensors. The excellent performance and simplicity of our proposed sensors are promising for biomedical, biochemical, and physical applications.
Highlights
Optic fiber-based sensors are becoming increasingly mature and have seen an increasing demand in the fields of biotechnology, energy, superconducting magnets, biomedicine, healthcare, aerospace, automotive technology, and civil engineering [1,2,3]
Numerous hybrid intrinsic Fabry–Perot interferometer-based temperature sensors have been developed by combining hollow core fibers, multimode fibers, photonic crystal fibers, and dual-core photonic crystal fibers with single-mode fibers (SMFs) [2,19,20,21]
A high-quality DFPI-based sensor can be obtained if the coating material conforms to the Fresnel reflection criterion, according to which the refractive index (RI) of the coating material should be higher than that of the fiber core and air (1.0) [23,33]
Summary
Optic fiber-based sensors are becoming increasingly mature and have seen an increasing demand in the fields of biotechnology, energy, superconducting magnets, biomedicine, healthcare, aerospace, automotive technology, and civil engineering [1,2,3]. Fabry–Perot interferometer-based temperature sensing utilizes the simple Fresnel reflection principle This principle accounts for the interference phenomenon owing to the difference between the thermo-optic coefficient (TOC) and the thermal expansion coefficient (TEC) of the coating material. Numerous hybrid intrinsic Fabry–Perot interferometer-based temperature sensors have been developed by combining hollow core fibers, multimode fibers, photonic crystal fibers, and dual-core photonic crystal fibers with single-mode fibers (SMFs) [2,19,20,21]. Such hybrid sensors are highly sensitive; they have some disadvantages, such as low reproducibility, high cost, and complicated fabrication
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
