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通过将Loop型谐振腔嵌入在具有正热光系数的MgF2中,设计了海水中温度弱敏感的盐度传感器来实现海水盐度测量。利用COMSOL软件建立海水盐度传感模型,结合Matlab对盐度传感器的特征参量进行数值研究。结果表明:传感器的温度特性依赖于微纳光纤的半径,温度弱敏感的光纤半径随探测波长的减小而减小;盐度灵敏度随镀膜厚度和光纤半径的增大而减小;探测极限随镀膜厚度的增加而增大,随波长的减小而减小。通过优化,传感器盐度灵敏度可达0.025 nm/(mg/mL),探测极限可达到0.15 mg/mL。
By embedding the Loop resonator in MgF2 with a positive thermal coefficient, a salinity sensor is designed to measure the salinity of seawater. The seawater salinity sensing model was established by COMSOL software, and the salient characteristic parameters of salinity sensor were numerically studied with Matlab. The results show that the temperature dependence of the sensor depends on the radius of the micro-nano fiber. The temperature-sensitive fiber radius decreases with the decrease of the detection wavelength. The salinity sensitivity decreases with the increase of coating thickness and fiber radius. Coating thickness increases with increasing wavelength decreases with the decrease. Through optimization, the sensitivity of the sensor salinity up to 0.025 nm / (mg / mL), detection limit of up to 0.15 mg / mL.