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A Spatially Distributed Fiber-Optic Temperature Sensor for Applications in the Steel Industry

机译：用于钢铁工业应用的空间分布式光纤温度传感器

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摘要

This paper presents a spatially distributed fiber-optic sensor system designed for demanding applications, like temperature measurements in the steel industry. The sensor system employed optical frequency domain reflectometry (OFDR) to interrogate Rayleigh backscattering signals in single-mode optical fibers. Temperature measurements employing the OFDR system were compared with conventional thermocouple measurements, accentuating the spatially distributed sensing capability of the fiber-optic system. Experiments were designed and conducted to test the spatial thermal mapping capability of the fiber-optic temperature measurement system. Experimental simulations provided evidence that the optical fiber system could resolve closely spaced temperature features, due to the high spatial resolution and fast measurement rates of the OFDR system. The ability of the fiber-optic system to perform temperature measurements in a metal casting was tested by monitoring aluminum solidification in a sand mold. The optical fiber, encased in a stainless steel tube, survived both mechanically and optically at temperatures exceeding 700 °C. The ability to distinguish between closely spaced temperature features that generate information-rich thermal maps opens up many applications in the steel industry.
机译：本文介绍了设计用于苛刻应用的空间分布式光纤传感器系统，如钢铁工业的温度测量。传感器系统采用光学频域反射区（OFDR）以在单模光纤中询问瑞利反向散射信号。将采用DSDR系统的温度测量与常规热电偶测量进行比较，使光纤系统的空间分布式感测能力进行了诱惑。设计并进行了实验，以测试光纤温度测量系统的空间热映射能力。实验仿真提供了证据表明，由于OFDR系统的高空间分辨率和快速测量速率，光纤系统可以解决紧密间隔的温度特征。通过在砂模中监测铝凝固来测试光纤系统在金属铸件中进行温度测量的能力。在不锈钢管中包装的光纤，在超过700℃的温度下机械和光学均存活。能够区分产生信息丰富的热贴图的紧密间隔温度特征，在钢铁工业中开辟了许多应用。

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