Speakers
Description
Within industries such as nuclear reactors and aerospace, working environments have extreme temperatures ranging from cryogenic operations below -$100\,^{\circ}\mathrm{C}$ to high heat at $300\,^{\circ}\mathrm{C}$. Fiber Bragg Grating (FBG) sensors with polyimide coating offer a promising solution due to their compact size, multiplexing capability, and resistance to signal degradation in high temperatures. In this study, temperature-sensitive FBG sensors with polyimide coating from iXblue are experimentally characterised to evaluate their suitability for high-temperature operation in such environments. Controlled temperature calibration experiments were conducted over an extended temperature range to determine the thermal response of the sensors. The Bragg wavelength shift was recorded as a function of temperature, and key performance metrics including sensitivity, linearity, and repeatability were evaluated. Particular attention was given to sensor stability and consistency under elevated temperatures representative of nuclear and aerospace conditions. The results demonstrate that the sensors exhibit a strong and repeatable linear response across the tested temperature range, with stable sensitivity coefficients and minimal hysteresis. These findings confirm the suitability of radiation-hardened FBG sensors for precise temperature monitoring in extreme environments, supporting their potential deployment in nuclear reactors, space systems, and other high-temperature applications.
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