Measurement of Thermal Gradients Using Long Period Gratings at Different Levels of Ambient Refractive Indices
| Autor: | Marcel Koffi, Wojtek J. Bock, Frédéric Lesage, Predrag Mikulic, Tinko Eftimov |
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| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
Materials science Optical fiber Physics::Optics 02 engineering and technology Grating 01 natural sciences Temperature measurement law.invention 010309 optics 020210 optoelectronics & photonics Optics Fiber Bragg grating law Long period 0103 physical sciences Thermal 0202 electrical engineering electronic engineering information engineering Mean radiant temperature business.industry 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Temperature gradient Fiber optic sensor 0210 nano-technology business Refractive index |
| Zdroj: | Journal of Lightwave Technology. 37:4674-4679 |
| ISSN: | 1558-2213 0733-8724 |
| DOI: | 10.1109/jlt.2019.2916229 |
| Popis: | In this paper, we present the results for thermal gradient measurements using constant period UV written long-period gratings (LPGs) in photosensitive and SMF-28 fibers. We have studied theoretically and experimentally the effect of thermal gradients on the spectrum of LPGs. It has been shown theoretically and confirmed experimentally that thermal gradients lead to changes of the depth of the grating spectrum while changes of the mean temperature cause shifts of the resonance wavelength. Thus, thermal gradients and average temperature can be independently measured using a single LPG. Sensitivities to temperature difference and to average temperature for LPGs in air have been found to be higher than in water. |
| Databáze: | OpenAIRE |
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