Abstract. A compact all-fiber temperature sensor based on a gold nanoparticle (GNP)-coated macrobent standard single-mode fiber (SMF) has been proposed and experimentally demonstrated. It can be easily constructed by just bending an SMF into a suitable bending radius to constitute a Mach–Zehnder modal interferometer. The sensing area of the bent SMF was coated with GNP utilizing the magnetron sputtering technique. Different tuned GNP thicknesses of ∼10, 20, and 30 nm were deposited on different bent fibers and the temperature-sensing performance was examined experimentally. Throughout the experiments, the wavelengths of the monitored interference dips decreased gradually and were blueshifted with an increase in temperature in the range of 35°C to 47°C. Among the three coated sensing heads, the proposed sensor coated by an ∼20-nm layer thickness of GNP showed the best performance with excellent sensitivity, fast rise time, and an excellent resolution of −2.56 nm / °C, 1.73 ms, and 1.82 × 10 − 4°C, respectively. Benefiting from its excellent advantages of simple configuration, easy fabrication, and high mechanical strength, this high-sensitivity temperature sensor could be a competitive candidate for precise temperature measurement of the human body.

中文翻译：

---

全光纤、基于金纳米粒子涂层宏弯单模光纤的高灵敏度传感器，用于人体温度监测

摘要。已经提出并实验证明了一种基于金纳米粒子 (GNP) 涂层宏弯标准单模光纤 (SMF) 的紧凑型全光纤温度传感器。只需将 SMF 弯曲成合适的弯曲半径即可轻松构建它，以构成 Mach-Zehnder 模态干涉仪。利用磁控溅射技术在弯曲的 SMF 的传感区域涂上 GNP。将~10、20 和 30 nm 的不同调谐 GNP 厚度沉积在不同的弯曲纤维上，并通过实验检查温度传感性能。在整个实验过程中，监测到的干涉下降的波长逐渐减少，并且随着温度在 35°C 到 47°C 范围内升高而发生蓝移。在三个涂层传感头中，所提出的由~20 纳米 GNP 层厚度涂覆的传感器表现出最佳性能，具有出色的灵敏度、快速的上升时间和 -2.56 nm / °C、1.73 ms 和 1.82 × 10 − 4°C 的出色分辨率分别。得益于其配置简单、制造容易、机械强度高等优点，这种高灵敏度的温度传感器有望成为精确测量人体温度的有力竞争者。