为了实现对海水温度与盐度变化的同时监测，提出了一种基于光子晶体光纤（PCF）的表面等离子体共振（SPR）传感器。该传感器探头通过在两段多模光纤之间熔接一段PCF实现，并在PCF表面镀金膜用以激发SPR现象。该方案将光纤SPR传感探头与温敏材料聚二甲基硅氧烷相结合形成双重SPR效应，实现了海水的温度与盐度同时检测。实验结果表明：该传感器的最大温度灵敏度为-2.021 nm/℃，最大盐度灵敏度为0.418 nm/‰。该传感器体积小、制作简单、性能优异，适用于海水的多参数、分布式测量，在液态物质测量中有较好的应用前景。

With the aim of achieving the simultaneous monitoring of changes in seawater temperature and salinity, we propose a surface plasmon resonance (SPR) sensor based on photonic crystal fibers (PCFs). The sensor probe is realized by fusing a segment of PCF between two segments of multimode fiber and plating a gold film on the surface of the PCF to stimulate the SPR phenomenon. This scheme combines the fiber optic SPR sensing probe with the temperature-sensitive material polydimethylsiloxane to form a dual SPR effect, achieving the simultaneous detection of the temperature and salinity of seawater. The experimental results show that the maximum temperature sensitivity of the sensor is－2.021 nm/℃, and the maximum salinity sensitivity is 0.418 nm/‰. This sensor has a small volume, simple production, and excellent performance. It is suitable for multi-parameter and distributed measurements of seawater and has good application prospects in liquid substance measurement.