基于光纤SPR光谱分析的水质矿化度检测研究

从溶液离子影响表面等离子体共振(SPR)光谱特征的角度，分析讨论了光纤SPR光谱对水溶液离子成分检测的灵敏特征，基于此并应用于以矿化度为代表的水质检测中。研究通过对不同离子状态的电解质溶液(NaCl，KCl，CaCl₂，MgCl₂，Na₂CO₃，MgSO₄和ZnSO₄)和非电解质溶液(蔗糖、丙三醇、葡萄糖)下的光纤SPR光谱分析，得到水环境的杂质离子含量对SPR光谱的影响规律，进而实现了水质矿化度的检测。研究同时给出了光纤SPR光谱法与电导率分析法在八种不同水样的检测对比分析，光纤SPR光谱法拥有高灵敏度、快速响应、抗电磁干扰等优点，对光纤SPR技术在水质检测领域的应用打下良好的基础。

Surface Plasmon Resonance Spectral Based Fiber Optic Sensor for Detection of Total Dissolved Solids in Water Quality Analysis

As surface plasmon resonance (SPR) spectrum is sensitive to refractive index of the mediums, we explored its sensitivity characteristic of ions composition detection in a solution so as to measure the total dissolved solid value in water. Seven ionic (NaCl, KCl, CaCl₂, MgCl₂, Na₂CO₃, MgSO₄ and ZnSO₄) and 3 non-ionic (glucose, glycerol and sucrose) liquid samples were studied experimentally with a fiber optic SPR sensor. The influence of ion concentration on the resonance wavelength shift in SPR spectrum was investigated and discussed, and with that, the response curves were established to realize the detection of total dissolved solid in water quality analysis. The FO-SPR sensor spectral curve for TDS measurement was in conformity with ionic conductivity in 8 different water samples, and results show that the spectral method was better in high ion concentration detection of water. This research will broaden the SPR application in the field of water quality monitoring.