Chloride erosion is the main factor to decrease durability of concrete, it is fairly important to control and monitor chloride in concrete structure. A new sensor based on a suspended core optical fiber was developed to detect the chloride in concrete, in which lucigenin is selected as a fluorescence sensitive material for chloride. A novel type of the sol-gel membrane was introduced to immobilize lucigenin onto the inner wall of the suspended core optical fiber with dip-coating method. The properties of the sol-gel membrane were characterized by scanning electron microscope (SEM) and Fourier transforming infrared (FT-IR), and energy of evanescent field the suspended core optical fiber was calculated by using COMSOL. The fluorescence fluctuations of the optic fiber sensor are chloride concentration-dependent and the relationship between relative fluorescence intensity and chloride concentration follows the Stern–Volmer equation. The linear calibration formulas I₀/I = 1 + 1.463[Cl⁻] (R² = 0.973) and I₀/I = 1 + 1.982[Cl⁻] (R² = 0.984) with the detection limit of 0.02 M are obtained through detecting standard KCl solution and concrete simulated pore solution of KCl (pH = 13.5), respectively. Besides, specificity of the sensor is also tested.

氯离子侵蚀是降低混凝土耐久性的主要因素，控制和监测混凝土结构中的氯离子非常重要。开发了一种基于悬浮芯光纤的新型传感器，用于检测混凝土中的氯化物，其中选择了光泽精作为氯化物的荧光敏感材料。介绍了一种新型的溶胶-凝胶膜，采用浸涂法将黄精蛋白固定在悬浮芯光纤的内壁上。通过扫描电子显微镜（SEM）和傅立叶变换红外光谱（FT-IR）对溶胶-凝胶膜的性能进行了表征，并利用COMSOL计算了悬浮芯光纤的van逝场能量。光纤传感器的荧光波动取决于氯化物浓度，相对荧光强度和氯化物浓度之间的关系遵循Stern–Volmer方程。线性校准公式I 通过检测标准KCl溶液获得检出限为0.02 M的₀ / I = 1 + 1.463 [Cl ^- ]（R ²  = 0.973）和I ₀ / I = 1 + 1.982 [Cl ^- ]（R ² = 0.984）和KCl（pH = 13.5）的混凝土模拟孔隙溶液。此外，还测试了传感器的特异性。