We demonstrate a novel chalcogenide glass (ChG)-capped optical fiber temperature sensor capable of operating within harsh environment. The sensor architecture utilizes the heat-induced phase change (amorphous-to-crystalline) property of ChGs, which rapidly (80–100 ns) changes the optical properties of the material. The sensor response to temperature variation around the phase change of the ChG cap at the tip of the fiber provides abrupt changes in the reflected power intensity. This temperature is indicative of the temperature at the sensing node. We present the sensing performance of six different compositions of ChGs and a method to interpret the temperature profile between 440 ${}^{\circ }$C and 600 ${}^{\circ }$C in real-time using an array structure. The unique radiation-hardness property of ChGs makes the devices compatible with high-temperature and high-radiation environments, such as monitoring the cladding temperature of Light Water (LWR) or Sodium-cooled Fast (SFR) reactors.

中文翻译：

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卤化钨玻璃覆盖的光纤传感器，用于极端环境下的实时温度监测

我们演示了一种新颖的硫属化物玻璃（ChG）封盖的光纤温度传感器，能够在恶劣的环境下运行。传感器架构利用了ChGs的热诱导相变（非晶态至晶体）特性，该特性迅速（80–100 ns）改变了材料的光学特性。传感器对光纤尖端处ChG帽相变周围温度变化的响应可提供反射功率强度的突变。该温度指示感测节点处的温度。我们介绍了六种不同组成的ChG的传感性能，以及一种解释440之间温度曲线的方法${}^{\circ }$C和600 ${}^{\circ }$C实时使用数组结构。ChGs独特的辐射硬度特性使该设备与高温和高辐射环境兼容，例如监测轻水（LWR）或钠冷快（SFR）反应堆的包壳温度。