Department of Electrical Engineering and Smart Grid Research Center, Chonbuk National University, Jeonbuk 561-756, Korea.
Sensors (Basel). 2013 Jul 2;13(7):8403-11. doi: 10.3390/s130708403.
We propose and experimentally demonstrate the novel radio-frequency (RF) interrogation of a fiber Bragg grating (FBG) sensor using bidirectional modulation of a Mach-Zehnder electro-optical modulator (MZ-EOM). Based on the microwave photonic technique and active detection, the transfer function of the proposed system was obtained, and the time delay was calculated from the change in the free spectral range (FSR) at different wavelengths over the optimal measuring range. The results show that the time delay and the wavelength variation have a good linear relationship, with a gradient of 9.31 ps/nm. An actual measurement taken with a sensing FBG for temperature variation shows the relationship with a gradient of 0.93 ps/10 °C. The developed system could be used for FBG temperature or strain sensing and other multiplexed sensor applications.
我们提出并实验证明了一种新颖的光纤布拉格光栅（FBG）传感器的射频（RF）询问技术，该技术使用马赫-曾德尔电光调制器（MZ-EOM）的双向调制。基于微波光子技术和主动检测，获得了所提出系统的传递函数，并从不同波长在最佳测量范围内的自由光谱范围（FSR）的变化中计算出了时间延迟。结果表明，时间延迟和波长变化具有良好的线性关系，斜率为 9.31 ps/nm。用温度变化的传感 FBG 进行的实际测量显示出与 0.93 ps/10°C 的梯度关系。所开发的系统可用于 FBG 温度或应变传感以及其他多路复用传感器应用。
