14 May 2018 Low-cost fiber optic sensor array for simultaneous detection of hydrogen and temperature
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Monitoring the dissolved gases and oil temperatures are the most responsive and dependable strategies of assessing the running state and health of power transformers. Novel fiber optic sensor approaches that minimize the footprint and cost of chemical sensors compatible with electrical asset insulation oil monitoring can ultimately allow the deployment on a broader range of power assets. Fiber optic sensor arrays based on nanocomposite thin films for simultaneous gas and temperature sensing at low temperatures have been fabricated. The performance of the sensor array was evaluated with two sensing elements comprised of Pd and Au nanoparticle incorporated SiO2 thin films, which were deposited onto a coreless fiber by dip-coating in series and then fusion-spliced with two multimode fibers on either end. Such fiber optic sensor array showed monotonic responses over a wide range of H2 at ambient conditions. A response of the localized surface plasmon resonance absorption peak of Au to changing temperatures from ambient to 110 °C was observed. Optical responses of H2 and temperatures showed opposite directions in transmission signals, which were evaluated by using principal component analysis (PCA). The resulting PCA score plot clearly shows discrimination between the characteristic signal of H2 gas and temperature. In order to realize potential field deployment, the optical testing system employed low-cost components such as LEDs as fixedwavelength light sources and silicon photodiodes as detectors. The potential applications of such sensor arrays are dual-purpose gas and temperature sensing for on-site deployment in power transformers and other grid asset health monitoring.
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Chenhu Sun, Chenhu Sun, Ping Lu, Ping Lu, Ruishu Wright, Ruishu Wright, Paul R. Ohodnicki, Paul R. Ohodnicki, "Low-cost fiber optic sensor array for simultaneous detection of hydrogen and temperature", Proc. SPIE 10654, Fiber Optic Sensors and Applications XV, 1065405 (14 May 2018); doi: 10.1117/12.2304633; https://doi.org/10.1117/12.2304633

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