18 November 2013 Low-cost temperature measurement using LPG and total transmitted power
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Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 8785FH (2013) https://doi.org/10.1117/12.2027595
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal
Abstract
In this paper we present an extremely low-cost system for temperature measurement using Long Period Grating sensors (LPG) in such an unusual way that prevents experimenters and end users from utilizing OSA which are extremely expensive, thus saving tenths of thousand of euros. The basic idea is using total power measurement instead of wavelength shift for which a low-cost power meter is sufficient to precisely measure temperature. When certain fabrication conditions are met, the total transmitted power by the LPG has a monotonous behavior with temperature, making it a good and cost-effective sensor. Its sensitivity is approximately linear with 4.162 μW/°C and the uncertainty is about 1μW with a potential resolution of 0.24 °C. The results obtained so far show that this temperature sensor has a good performance and has many advantages over the standard FBG and LPG ones: exhibit short response time, portability and low cost.
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Pedro Simões, Paulo Lopes, "Low-cost temperature measurement using LPG and total transmitted power", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785FH (18 November 2013); doi: 10.1117/12.2027595; https://doi.org/10.1117/12.2027595
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