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A comparative study on polymer and metals coated TFBG temperature sensor: coating thickness impact

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Abstract

Recently, many researches have been conducted on a Taper Fiber Bragg Grating (TFBG) as a temperature sensor in a wide range of applications due to its significant merits. Besides, the majority of these researches have been focused on improving the sensor performance. In this work, the temperature sensitivity is enhanced by coating the sensor with four different materials Polymer, In, Zn and TiN with different coated layer thicknesses. This study presents the impact of the thickness layers of these materials on the overall performance of the TFBG temperature sensor. Different coating techniques are carried out which gave a uniform crystalline structure of the coated layer. Optical spectrum analyzer is used to monitor the Bragg wavelength shift of the TFBG sensor under different temperature values (25–150 °C). The results approve that the coating materials could enhance the temperature sensitivity depending on the material type and coating thickness, additionally, these coating layers sever as a protect layers for the grating area from the external environmental factors. For further investigation, simulation work is carried out using MATLAB; and there are good agreement between experimental and simulation studies. The results show that the layers with thickness of 50 µm, 15 µm, 7.5 µm and 12 µm were optimum thicknesses that gave a higher wavelength shift; hence higher temperature sensitivity for Polymer, Zn, TiN and In coating layers, respectively. Within these values, the temperature sensitivities were estimated to be 1.793 pm/°C, 2.351 pm/°C, 2.893 pm/°C and 3.547 pm/°C which enhanced approximately by factor 2, 3, 4 and 6 for Polymer, Zn, TiN and In coating layers respectively compared with sensitivity of bare TFBG sensor. This work will significantly enrich the knowledge of enhancing the sensor performance by polymer or metal coating approach.

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Acknowledgements

I appreciate the support obtained from Laser and Optoelectronics Engineering Department/ University of Technology – Iraq.

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This research was not funded by any public institution or private sector.

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  1. Laser and Optoelectronics Engineering, University of Technology, Baghdad, Iraq

    Zahraa S. Alshaikhli

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Author contributed to the whole study conception and design. Material preparation, data collection and analysis were performed by ZSA. The first draft of the manuscript and final manuscript were written by ZSA. The author read and approved the final manuscript.

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Correspondence to Zahraa S. Alshaikhli.

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Alshaikhli, Z.S. A comparative study on polymer and metals coated TFBG temperature sensor: coating thickness impact. Appl. Phys. A 130, 127 (2024). https://doi.org/10.1007/s00339-023-07269-7

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