光纤型表面等离子体共振(SPR)传感器波长通常处于可见光波段，为使该类器件工作在光通信窗口，提出一种基于光栅结构的波长可控型海水折射率传感器，传感器传感区域由镀有光栅结构的侧边抛磨光纤构成。研究了传感区域横截面的电场强度分布、光栅不同结构参数与SPR传感器波长的关系以及在海水折射率范围内随着折射率变化共振波长的变化趋势，最后分析了共振波长与折射率两者的关系，得出该传感器灵敏度为5650 nm/RIU，分辨率可达到1.77×10-6 RIU,可实现快速、高灵敏度的海水折射率测量。

A tilt sensor based on an intermodal photonic crystal fiber (PCF) interferometer is demonstrated. The sensor consists of a tubular filled with NaCl aqueous solutions and an intermodal PCF interferometer, which is formed by using a short PCF with two single-mode fibers (SMFs) spliced at both ends, and the air-holes in the splice regions are fully collapsed. The intermodal PCF interferometer is fixed in a rigid glass tubular with a slant orientation, and a half of the PCF is immersed in the NaCl aqueous solutions, while the other half is exposed in air. When tilting the tubular, the length of the PCF immersed changes so that the transmission spectrum moves. Therefore, by monitoring the wavelength shift, the tilt angle can be achieved. In the experiment, a 0.8-cm-length intermodal PCF interferometer was adopted. The sensitivity of the proposed sensor was obtained from -1.5461 nm/° to -30.1244 nm/° when measuring from -35.1° to 37.05°.

报道了一种基于腰椎放大和单模多模单模(SMS)光纤结构相结合的折射率传感器。在两根单模光纤(SMF)之间，放大熔接一根长为18 mm的多模光纤(MMF)，构成全光纤传感器。外界折射率的变化会引起光纤包层模的有效折射率的改变，从而导致干涉光谱的变化。实验结果表明，当外界折射率变化范围为1.3725~1.4620时，传感器的灵敏度为152.237 nm/RIU(RIU为折射率单位)。该折射率传感器的温度交叉灵敏度为2.6×10-4RIU/℃，因此温度变化很小时，温度对折射率测量的影响可以忽略。该的折射率传感器制造简单且成本低，因此在生物化学测量中有比较好的应用前景。

介绍了一种可测量相对湿度的March-Zehnder(MZ)干涉的湿度光纤传感器，其传感结构是在两段标准单模之间腰椎放大熔接一段长为15 mm 的单模光纤，并在中间的单模部分涂上一层5%的聚乙烯醇(PVA)。PVA 的折射率随着环境湿度的变化而改变，从而使包层模有效折射率发生变化。当中间单模光纤周围环境湿度发生变化时，相应干涉峰中心波长也会发生移动，通过测量透射光谱来测量包层周围环境的湿度变化。实验测得该湿度传感器的灵敏度为0.0983 nm/%RH（RH 表示相对湿度）。实验也证明基于MZ 干涉的湿度光纤传感器具有良好的稳定性等一系列突出的优点。

A brief review of recent progress in researches, productions and applications of full distributed fiber Raman photon sensors at China Jiliang University (CJLU) is presented. In order to improve the measurement distance, the accuracy, the space resolution, the ability of multi-parameter measurements, and the intelligence of full distributed fiber sensor systems, a new generation fiber sensor technology based on the optical fiber nonlinear scattering fusion principle is proposed. A series of new generation full distributed fiber sensors are investigated and designed, which consist of new generation ultra-long distance full distributed fiber Raman and Rayleigh scattering photon sensors integrated with a fiber Raman amplifier, auto-correction full distributed fiber Raman photon temperature sensors based on Raman correlation dual sources, full distributed fiber Raman photon temperature sensors based on a pulse coding source, full distributed fiber Raman photon temperature sensors using a fiber Raman wavelength shifter, a new type of Brillouin optical time domain analyzers (BOTDAs) integrated with a fiber Raman amplifier for replacing a fiber Brillouin amplifier, full distributed fiber Raman and Brillouin photon sensors integrated with a fiber Raman amplifier, and full distributed fiber Brillouin photon sensors integrated with a fiber Brillouin frequency shifter. The Internet of things is believed as one of candidates of the next technological revolution, which has driven hundreds of millions of class markets. Sensor networks are important components of the Internet of things. The full distributed optical fiber sensor network (Rayleigh, Raman, and Brillouin scattering) is a 3S (smart materials, smart structure, and smart skill) system, which is easy to construct smart fiber sensor networks. The distributed optical fiber sensor can be embedded in the power grids, railways, bridges, tunnels, roads, constructions, water supply systems, dams, oil and gas pipelines and other facilities, and can be integrated with wireless networks.

The authors overview recent progress of fiber loop mirror based sensors in China Jiliang University. With the unique characteristics of fiber loop mirror made by various inserted fibers, fiber loop mirror based sensors have the potential to be exploited in a variety of wide applications.

提出了一种基于倾斜光纤光栅与多模光纤相结合的温度不敏感振动传感器，其振动传感头是在倾斜光纤光栅与单模光纤之间加入一小段多模光纤所组成。倾斜光纤光栅的反射光谱有布拉格模和包层模两部分组成，其中多模光纤的作用是将倾斜光纤光栅反射包层模耦合到单模光纤的基模。倾斜光纤光栅包层模对外界振动很敏感，通过传感器的包层模平均输出功率完成对外界振动物理量测量。由于采用强度解调的方式，可以大大降低传感器装置的复杂性。实验表明：当传感器温度从20 ℃上升到70 ℃时，传感器的输出平均光功率均方根误差为0.01 μW，其反射光谱平均输出功率影响很小，故可以避免外界温度对测量结果的影响。

提出了一种基于两段相同长度的保偏光纤环镜的温度不敏感相对湿度传感器，其中一段保偏光纤经高浓度的氢氟酸腐蚀后覆以一层湿敏材料聚乙烯醇薄膜用于获得空气的相对湿度，另一段保偏光纤则对传感器的温度进行补偿。该传感器成功实现了对周围环境相对湿度(RH)20%~80%范围内的测量，同时不受外界环境温度的影响。实验表明，该传感器所得数据呈现出良好的线性关系，获得的湿度灵敏度为0.98 nm/%(RH)，温度所带来的影响仅为0.0072 nm/℃，达到了消除温度影响的目的。

提出一种使用磁性液体的新型光纤Sagnac磁场传感器。磁性液体具有磁致可变双折射效应和二向色性，在外加磁场作用下，液体中的磁性纳米粒子沿磁场方向结链规则排列，形成各向异性。将其制成液体薄膜，放入具有一段保偏光纤的Sagnac环中，使光纤Saganc干涉仪的正弦形状干涉光谱可随外磁场变化。光纤中传输光垂直经过磁性液体薄膜，在外加磁场与磁性液体薄膜平面平行时，传输光产生双折射现象，干涉光谱的峰值波长随着外加磁场的变化而变化。传感器灵敏度与磁性液体薄膜厚度有关，对于60 μm的磁性液体薄膜，灵敏度为16.7 pm/Oe(1 Oe≈79.578 A/m)，分辨率为0.60 Oe。而在外加磁场与磁性液体平面垂直时，干涉光谱的峰值波长几乎不随外加磁场的变化而变化。

提出了一种基于光子晶体光纤Sagnac干涉仪的横向压力传感器。使用的光子晶体光纤为低双折射光纤，首先预先在Saganc环中的光子晶体光纤上施加初始压力，使Sagnac干涉仪产生正弦干涉光谱，然后再将被测物体放在光子晶体光纤上，由于被测物体重力的作用，Saganc干涉仪输出的光谱产生移动，实现横向压力传感测量。传感器具有高灵敏度0.529 nm/(N·mm)及超低的温度系数-0.4 pm/℃，其环境温度的影响可以忽略。