Temperature Sensors Based on Polymer Fiber Optic Interferometer

Abstract

Temperature measurements are of great importance in many fields of human activities, including industry, technology, and science. For example, obtaining a certain temperature value or a sudden change in it can be the primary control marker of a chemical process. Fiber optic sensors have remarkable properties giving a broad range of applications. They enable continuous real-time temperature control in difficult-to-reach areas, in hazardous working environments (air pollution, chemical or ionizing contamination), and in the presence of electromagnetic disturbances. The use of fiber optic temperature sensors in polymer technology can significantly reduce the cost of their production. Moreover, the installation process and usage would be simplified. As a result, these types of sensors would become increasingly popular in industrial solutions. This review provides a critical overview of the latest development of fiber optic temperature sensors based on Fabry–Pérot interferometer made with polymer technology.

Ratiometric Temperature Sensing Using Highly Coupled Seven-Core Fibers

“…The SCF lengths were cleaved without using highly accurate stages, and the splicing between SMF and SCF used a standard splicing procedure in our Fujikura 60S splicer. Our fabrication process is straightforward if we compare it to very complex fiber structures that have been reported to achieve interferometric devices that can provide a sinusoidal spectral response [ 42 , 43 ]. This is a critical issue for a potential commercial application where simple fabrication processes are highly convenient.…”

Fiber Optic Temperature Sensor System Using Air-Filled Fabry–Pérot Cavity with Variable Pressure

“…Temperature is a key parameter that needs to be monitored and controlled precisely in a wide range of applications, including industrial, chemical, structural, biomedical, and environmental aspects. For the last three decades, various techniques have been developed regarding fiber optic temperature sensors such as fiber-Bragg grating (FBG)-based sensors [ 5 ], tapered fiber [ 6 ], waveguide coupling devices using surface plasmon resonance [ 7 ], fiber ring laser demodulation [ 8 ], modified fibers (panda fibers [ 9 ], multicore fiber [ 10 ]), and interferometer-based sensors [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Among these, temperature sensors based on Fabry–Pérot (FP) interferometers have proved to be an attractive option because of their additional advantages of simple structure and easy fabrication.…”

“…Nowadays, different types of FP interferometers are deployed, in terms of their composition and fabrication process. For example, interferometers can belong to the following types (a) fiber-tip: SMF-microfiber [ 11 ], SMF-polyvinyl alcohol [ 12 ]; (b) with diaphragm: FBG-graphene [ 13 , 14 ], MMF-silicon [ 15 ], FBG-fused silica [ 16 ]; (c) without diaphragm [ 17 ]; (d) polymer materials [ 18 ]; (e) inline microcavities [ 19 , 20 ]; (e) multiplexed sensors [ 21 ]; (f) microcantilever [ 22 ], polished materials [ 27 ]. However, each type of sensor has some drawbacks, which limit their application.…”

Impact of temperature on optical sensing in biology based on investigation of SARS‐CoV‐2

“…There are temperature sensors constructed with materials which parameters changes [ 9 ] (e.g., refractive index) due to the temperature changes [ 10 , 11 , 12 ]. Despite many changes of such sensors, their probes are based on the materials which make them toxic for biological tissue, their dimensions are too big to measure small samples [ 13 , 14 , 15 ] or the needed power for the proper operation can destroy the biological samples [ 16 , 17 , 18 ].…”