U-Shaped Polymer Cladding and Hetero-Core Fiber Optic Sensors for Monitoring Scale Formation in Geothermal Brine
U-Shaped Polymer Cladding and Hetero-Core Fiber Optic Sensors for Monitoring Scale Formation in Geothermal Brine
复制标题
用于监测地热盐水中水垢形成的 U 形聚合物包层和异芯光纤传感器
DOI：
10.1080/00032719.2020.1732400
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发表时间：
2020
影响因子：
2
通讯作者：
Kuramitz Hideki
中科院分区：
文献类型：
--
作者：
Okazaki Takuya;Seto Ryuichi;Watanabe Tomoaki;Ueda Akira;Kuramitz Hideki
在开发用于监测地热盐水中结垢的光纤传感器时，高灵敏度和易于处理是期望的特征。这些特性已经成功地增强了U形传感器的其他应用。在这项工作中，U形光纤传感器的规模形成的报告。这种传感器很容易通过弯曲多模光纤的暴露芯来制造。两种类型的光纤，即，聚合物包层石英光纤和异芯结构光纤，用于制备U型传感器。水和纤芯之间的全内反射百分比受表面上形成的CaCO3垢的高折射率的影响。对于实验室测量，U形光纤传感器相对于碳酸钙的形成的光学响应进行了研究，在氯化钙水溶液和碳酸氢钠的混合物中，使用白光源和光谱检测器。U形纤维传感器对传感器表面上的碳酸钙形成有响应。当将U形传感器与其直的对应物进行比较时，几乎没有检测到灵敏度的变化。透射率的变化与弯曲半径无关。最后，U形聚合物包层光纤传感器用于监测在Takigami地热发电厂的地热盐水中的硅垢形成。
In the development of fiber optic sensors for monitoring scale formation in geothermal brine, high sensitivity and easy handling are desirable features. These characteristics have already been successfully enhanced for U-shaped sensors with other applications. In this work, U-shaped fiber optic sensors for scale formation are reported. The sensors were easily fabricated by bending the exposed core of a multimode fiber optic. Two types of fiber optics, i.e., a polymer cladding silica fiber and a hetero-core structure fiber, were used in preparing the U-shaped sensors. The percentage of total internal reflection between water and the fiber core is affected by the high refractive index of the CaCO3scale formed on the surface. For laboratory measurements, the optical responses of the U-shaped fiber sensors with respect to calcium carbonate formation were investigated in a mixture of calcium chloride dehydrate and sodium hydrogen carbonate using a white-light source and a spectroscopic detector. The U-shaped fiber sensors were responsive to calcium carbonate formation on the sensor surface. Almost no change in the sensitivity was detected when comparing the U-shaped sensors with their straight counterparts. The transmittance changes were independent of the bending radius. Finally, the U-shaped polymer cladding fiber sensor was used to monitor the silica scale formation in geothermal brine at the Takigami geothermal plant.
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DOI：
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