Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Sensors (Basel). 2019 Sep 20;19(19):4063. doi: 10.3390/s19194063.
A highly sensitive temperature sensor based on surface plasmon resonance (SPR) of a side-polished single mode fiber is demonstrated. The sensor consists of a gold film coated side-polished fiber covered by a layer of UV-curable adhesive. Before introducing the UV-curable adhesive, the gold-coated fiber exhibits refractive index (RI) sensitivity of 1691.6 nm/RIU to 8800 nm/RIU in the range of 1.32 to 1.43. The resonant wavelength of the SPR sensor shifts to 650 nm when the adhesive is coated on the gold film, and is fixed at about 725 nm when the adhesive is cured. Due to the high thermo-optic and thermal expansion coefficient of the adhesive, the sensor structure achieves a temperature sensitivity of -0.978 nm/°C between 25 °C and 100 °C. The proposed optical fiber SPR sensor is simple, highly sensitive and cost effective, which may find potential applications for temperature measurements in the biomedical and environmental industries.
一种基于侧面抛磨单模光纤表面等离子体共振（SPR）的高灵敏度温度传感器得到了演示。该传感器由涂覆有金膜的侧面抛磨光纤和一层紫外光固化胶组成。在引入紫外光固化胶之前，金涂层光纤在折射率（RI）为 1.32 至 1.43 范围内的 RI 灵敏度为 1691.6nm/RIU 至 8800nm/RIU。当将胶涂覆在金膜上时，SPR 传感器的共振波长移至 650nm，而当胶固化时，共振波长固定在约 725nm。由于胶的高热光系数和热膨胀系数，传感器结构在 25°C 至 100°C 之间实现了-0.978nm/°C 的温度灵敏度。所提出的光纤 SPR 传感器结构简单、灵敏度高且具有成本效益，可能在生物医学和环境工业中的温度测量中具有潜在的应用。
