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首页> 外文期刊>Optics Letters >Nanoscale TiO_2-coated LPGs as radiation-tolerant humidity sensors for high-energy physics applications
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Nanoscale TiO_2-coated LPGs as radiation-tolerant humidity sensors for high-energy physics applications

机译：纳米TiO_2涂层的液化石油气作为耐辐射的湿度传感器，用于高能物理应用

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摘要

This Letter deals with a feasibility analysis for the development of radiation-tolerant fiber-optic humidity sensors based on long-period grating (LPG) technology to be applied in high-energy physics (HEP) experiments currently running at the European Organization for Nuclear Research (CERN). In particular, here we propose a high-sensitivity LPG sensor coated with a finely tuned titanium dioxide (TiO_2) thin layer (～100 nm thick) through the solgel deposition method. Relative humidity (RH) monitoring in the range 0%-75% and at four different temperatures (in the range -10℃-25℃) was carried out to assess sensor performance in real operative conditions required in typical experiments running at CERN. Experimental results demonstrate the very high RH sensitivities of the proposed device (up to 1.4 nm/% RH in correspondence to very low humidity levels), which turned out to be from one to three orders of magnitude higher than those exhibited by fiber Bragg grating sensors coated with micrometer-thin polyimide overlays. The radiation tolerance capability of the TiO_2-coated LPG sensor is also investigated by comparing the sensing performance before and after its exposure to a 1 Mrad dose of γ-ionizing radiation. Overall, the results collected demonstrate the strong potential of the proposed technology with regard to its future exploitation in HEP applications as a robust and valid alternative to the commercial (polymer-based) hygrometers currently used.
机译：这封信涉及开发基于长周期光栅（LPG）技术的耐辐射光纤湿度传感器的可行性分析，该传感器将用于目前正在欧洲核研究组织运行的高能物理（HEP）实验中（CERN）。特别是，在这里，我们提出了一种通过溶胶凝胶沉积法在微调的二氧化钛（TiO_2）薄层（约100 nm厚）上涂覆的高灵敏度LPG传感器。进行了相对湿度（RH）监测（在0％-75％的范围内）和四个不同的温度（在-10℃-25℃的范围内），以评估在CERN进行的典型实验所需的实际操作条件下的传感器性能。实验结果表明，所提出的设备具有很高的RH灵敏度（相对于非常低的湿度，高达RH为1.4 nm /％RH），结果比光纤布拉格光栅传感器的灵敏度高出一到三个数量级。涂有微米级的薄聚酰亚胺覆盖层。还通过比较暴露于1 Mrad剂量的γ电离辐射之前和之后的传感性能，研究了涂覆TiO_2的LPG传感器的辐射耐受能力。总体而言，收集到的结果证明了该提议技术在HEP应用中的未来开发方面的强大潜力，可以作为当前使用的商用（基于聚合物的）湿度计的强大而有效的替代方案。

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