Kim Hyeon-Ho, Choi Sang-Jin, Jeon Keum Soo, Pan Jae-Kyung
Department of Electrical Engineering and Smart Grid Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Korea.
Wind Valley Co. Ltd., 4 Yulchonsan-daero, Haeryong-myeon, Suncheon 58025, Korea.
Sensors (Basel). 2016 Feb 24;16(3):277. doi: 10.3390/s16030277.
We propose a novel non-contact optical fiber displacement sensor. It uses a radio frequency (RF) interrogation technique which is based on bidirectional modulation of a Mach-Zehnder electro-optical modulator (MZ-EOM). The displacement is measured from the free spectral range (FSR) which is determined by the dip frequencies of the modulated MZ-EOM transfer function. In experiments, the proposed sensor showed a sensitivity of 456 kHz/mm or 1.043 kHz/V in a measurement range of 7 mm. The displacement resolution of the proposed sensor depends on the linewidth and the power of the optical source. Resolution better than 0.05 μm would be achieved if an optical source which has a linewidth narrower than 1.5 nm and a received power larger than -36 dBm is used. Also, the multiplexing characteristic of the proposed sensor was experimentally validated.
我们提出了一种新型非接触式光纤位移传感器。它采用基于马赫-曾德尔电光调制器（MZ-EOM）双向调制的射频（RF）询问技术。位移是通过自由光谱范围（FSR）来测量的，该自由光谱范围由调制后的MZ-EOM传递函数的凹陷频率确定。在实验中，所提出的传感器在7mm的测量范围内显示出456kHz/mm或1.043kHz/V的灵敏度。所提出传感器的位移分辨率取决于光源的线宽和功率。如果使用线宽小于1.5nm且接收功率大于-36dBm的光源，将实现优于0.05μm的分辨率。此外，所提出传感器的复用特性也通过实验得到了验证。
