Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea.
Sensors (Basel). 2012;12(5):5888-95. doi: 10.3390/s120505888. Epub 2012 May 8.
We propose and demonstrate a fiber Bragg grating (FBG) sensor network employing the code division multiple access (CDMA) technique to identify information from individual sensors. To detect information without considering time delays between sensors, a sliding correlation method is applied, in which two different signals with the same pseudo-random binary sequence (PRBS) pattern, but slightly different frequencies, are applied to the source and detector sides. Moreover, for time domain detection, a wavelength-to-time conversion technique using a wavelength dispersive medium is introduced. The experimental results show that the proposed sensor network has a wide strain dynamic range of 2,400 με and a low crosstalk of 950:1.
我们提出并演示了一种采用码分多址（CDMA）技术的光纤布拉格光栅（FBG）传感器网络，以识别来自各个传感器的信息。为了在不考虑传感器之间时间延迟的情况下检测信息，应用了滑动相关方法，其中将两个具有相同伪随机二进制序列（PRBS）模式但略有不同频率的不同信号应用于光源和探测器侧。此外，对于时域检测，引入了使用波长色散介质的波长-时间转换技术。实验结果表明，所提出的传感器网络具有 2400 με 的宽应变动态范围和 950:1 的低串扰。
