School of Information Science and Engineering, Fujian University of Technology, Fuzhou 350118, China.
School of Aerospace Engineering, Xiamen University, Xiamen 361005, China.
Sensors (Basel). 2019 Mar 4;19(5):1097. doi: 10.3390/s19051097.
Herein we design a fiber sensor able to simultaneously measure the temperature and the pressure under harsh conditions, such as strong electromagnetic interference and high pressure. It is built on the basis of the fiber-optic Fabry⁻Perot (F⁻P) interference and the temperature sensitive mechanism of fluorescent materials. Both halogen lamps and light-emitting diodes (LED) are employed as the excitation light source. The reflected light from the sensor contains the low coherent information of interference cavity and the fluorescent lifetime. This information is independent due to the separate optical path and the different demodulation device. It delivers the messages of pressure and temperature, respectively. It is demonstrated that the sensor achieved pressure measurement at the range of 120⁻400 KPa at room temperature with a sensitivity of 1.5 nm/KPa. Moreover, the linearity of pressure against the cavity length variation was over 99.9%. In the meantime, a temperature measurement in the range of 25⁻80 °C, with a sensitivity of 0.0048 ms/°C, was obtained. These experimental results evince that this kind of sensor has a simple configuration, low-cost, and easy fabrication. As such, it can be particularly applied to many fields.
在此，我们设计了一种能够在恶劣条件下（如强电磁干扰和高压）同时测量温度和压力的光纤传感器。它基于光纤 Fabry⁻Perot（F⁻P）干涉和荧光材料的温度敏感机制。卤素灯和发光二极管（LED）都被用作激发光源。传感器的反射光包含干涉腔的低相干信息和荧光寿命。由于光路和不同的解调装置是分开的，这些信息是独立的。它们分别传递压力和温度的信息。实验结果表明，该传感器在室温下实现了 120⁻400 kPa 范围内的压力测量，灵敏度为 1.5nm/KPa。此外，腔长变化与压力的线性度超过 99.9%。同时，还获得了 25⁻80°C 范围内的温度测量结果，灵敏度为 0.0048ms/°C。这些实验结果表明，这种传感器具有结构简单、成本低、易于制造等优点。因此，它可以特别应用于许多领域。
