Multiplexing of optical fiber gas sensors with a frequency-modulated continuous-wave technique.
Multiplexing of optical fiber gas sensors with a frequency-modulated continuous-wave technique.
复制标题
采用调频连续波技术的光纤气体传感器的多路复用。
DOI：
10.1364/ao.40.001011
复制
发表时间：
2001
期刊：
影响因子：
1.9
通讯作者：
Y. Liao
中科院分区：
文献类型：
--
作者：
H. Yu;W. Jin;H. Ho;K. Chan;C. Chan;M. Demokan;G. Stewart;B. Culshaw;Y. Liao
我们报道了一种利用调频连续波技术来多路传输光纤气体传感器的方法。传感器网络是梯形拓扑，并由可调谐激光器进行询问。研究了系统在检测灵敏度和传感器间串扰方面的性能，发现来自不同通道的信号之间的相干混合限制了系统的性能。适当的波长调制扫描与低通滤波相结合，可以显著提高系统性能。计算机模拟表明，可以实现一个由37个乙炔传感器组成的阵列，每个传感器的检测精度为10(6)中的2000份。实验证明，一种双传感器乙炔检测系统对2.5厘米气体室的检测灵敏度为165ppm/10(6)(或最小可检测吸光度为2.1×10(-4))，串扰为-25分贝。
We report on the use of a frequency-modulated continuous-wave technique for multiplexing optical fiber gas sensors. The sensor network is of a ladder topology and is interrogated by a tunable laser. The system performance in terms of detection sensitivity and cross talk between sensors was investigated and found to be limited by coherent mixing between signals from different channels. The system performance can be improved significantly by use of appropriate wavelength modulation-scanning coupled with low-pass filtering. Computer simulation shows that an array of 37 acetylene sensors with a detection accuracy of 2000 parts in 10(6) for each sensor may be realized. A two-sensor acetylene detection system was experimentally demonstrated that had a detection sensitivity of 165 parts in 10(6) for 2.5-cm gas cells (or a minimum detectable absorbance of 2.1 x 10(-4)) and a cross talk of -25 dB.