Yang Fuling, Zhu Kehui, Yu Xiaoyi, Liu Tianze, Lu Ke, Wang Zelong, Li Yan
School of Mechanical and Electrical Engineering, China University of Mining and Technology, Beijing 100083, China.
Micromachines (Basel). 2024 Jan 16;15(1):140. doi: 10.3390/mi15010140.
We propose an air gap fiber Bragg grating (g-FBG) sensor that can measure strain and temperature simultaneously. The sensor is made by aligning two fiber Bragg gratings (FBGs), and an air gap exists between these two sub-gratings. This sensor's architecture allows it to form a spectrum with phase-shifted fiber Bragg grating (PSFBG) spectroscopy and Fabry-Perot interference (FPI) spectroscopy. Since the sensitivity of PSFBG and FPI spectra is different for strain and temperature, it is possible to measure both strain and temperature by measuring one of the reflected dips of PSFBG and the interference dip of FPI. The experimental results show that the strain sensitivity is about 11.95 pm/με via the dip wavelength detection of FPI, and the temperature sensitivity is about 9.64 pm/°C via the dip wavelength detection of PSFBG. The g-FBG sensor demonstrates a resolution of approximately ±3.7 με within the strain range of 0 to 1000 με and about ±0.6 °C within the temperature range of 25 °C to 120 °C. The proposed g-FBG sensor, characterized by its simple structure, compact size, and cost-effectiveness, exhibits significant potential in the field of multi-parameter measurements.
我们提出了一种能够同时测量应变和温度的气隙光纤布拉格光栅（g-FBG）传感器。该传感器通过将两个光纤布拉格光栅（FBG）对齐制成，这两个子光栅之间存在一个气隙。这种传感器的结构使其能够利用相移光纤布拉格光栅（PSFBG）光谱和法布里 - 珀罗干涉（FPI）光谱形成一个光谱。由于PSFBG和FPI光谱对应变和温度的灵敏度不同，通过测量PSFBG的一个反射凹陷和FPI的干涉凹陷之一，就有可能同时测量应变和温度。实验结果表明，通过FPI的凹陷波长检测，应变灵敏度约为11.95 pm/με，通过PSFBG的凹陷波长检测，温度灵敏度约为9.64 pm/°C。g-FBG传感器在0至1000 με的应变范围内分辨率约为±3.7 με，在25°C至120°C的温度范围内分辨率约为±0.6°C。所提出的g-FBG传感器具有结构简单、尺寸紧凑和成本效益高的特点，在多参数测量领域展现出巨大潜力。
