Zhang Zhe, Xu Baijie, Zhou Min, Bao Weijia, Xu Xizhen, Wang Ying, He Jun, Wang Yiping
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/GuangDong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060, China.
Micromachines (Basel). 2021 Feb 25;12(3):234. doi: 10.3390/mi12030234.
Over decades, fiber-optic temperature sensors based on conventional single-mode fibers (SMF) have been demonstrated with either high linearity and stability in a limited temperature region or poor linearity and thermal hysteresis in a high-temperature measurement range. For high-temperature measurements, isothermal annealing is typically necessary for the fiber-optic sensors, aiming at releasing the residual stress, eliminating the thermal hysteresis and, thus, improving the high-temperature measurement linearity and stability. In this article, an annealing-free fiber-optic high-temperature (1100 °C) sensor based on a diaphragm-free hollow-core fiber (HCF) Fabry-Perot interferometer (FPI) is proposed and experimentally demonstrated. The proposed sensor exhibits an excellent thermal stability and linearity (R > 0.99 in a 100-1100 °C range) without the need for high-temperature annealing. The proposed sensor is extremely simple in preparation, and the annealing-free property can reduce the cost of sensor production significantly, which is promising in mass production and industry applications.
几十年来，基于传统单模光纤（SMF）的光纤温度传感器已得到验证，它们要么在有限温度范围内具有高线性度和稳定性，要么在高温测量范围内线性度较差且存在热滞现象。对于高温测量，光纤传感器通常需要进行等温退火，目的是释放残余应力、消除热滞现象，从而提高高温测量的线性度和稳定性。在本文中，提出并通过实验验证了一种基于无膜空心光纤（HCF）法布里 - 珀罗干涉仪（FPI）的免退火光纤高温（1100°C）传感器。所提出的传感器具有出色的热稳定性和线性度（在100 - 1100°C范围内R > 0.99），无需高温退火。所提出的传感器制备极其简单，且免退火特性可显著降低传感器生产成本，在大规模生产和工业应用中具有广阔前景。
