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介绍了一种基于时分复用光纤传感技术的准分布折射率传感器。通过测量光纤端面的菲涅耳反射信号的强度,实现对待测溶液折射率的分布检测。在多个测量点之间采用不同长度的延迟光纤,利用不同传感位置处的菲涅耳反射信号回到测量端的时间差来实现距离可分辨的多点测量。实验结果表明该传感器的测量距离达16 km,测得折射率范围为1.3486~1.4525,对应的灵敏度范围为38.785~305.430 dB/RIU(RIU为折射率单元)。
A quasi-distributed refractive index sensor based on time-division multiplexing optical fiber sensing technology is introduced. By measuring the intensity of the Fresnel reflection signal on the end face of the fiber, the distribution of the refractive index of the solution to be measured is detected. The use of different lengths of delay fiber between multiple measurement points enables distance-resolved multipoint measurements using the time difference between the Fresnel reflected signals at different sensing locations back to the measurement end. The experimental results show that the sensor has a measuring distance of 16 km and a refractive index range of 1.3486 ~ 1.4525. The corresponding sensitivity range is 38.785 ~ 305.430 dB / RIU (RIU is the refractive index unit).