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基于光纤-电容液滴分析方法的原理,分析了光纤信号与水中盐度的关系,研究了盐度检测的可行性。利用菲涅耳公式推导了光纤信号与水中折射率的关系式,并由水中的盐度与折射率的关系及对应的数据表,计算了盐度变化引起的光纤信号的变化情况。搭建了实验装置,对20种不同盐度的溶液进行了实验,得到了20种溶液的光纤液滴指纹图及基于体积的液滴指纹图。分析结果表明,随着水中盐度的增加,光纤信号值不断增大。利用4滴完整液滴的光纤信号平均值分别建立了线性和二次多项式的盐度检测模型,通过比较两种模型的误差,得出线性模型检测误差较小、效果较好,最大检测误差为0.37%。
Based on the principle of optical fiber - capacitance drop analysis method, the relationship between optical fiber signal and salinity in water was analyzed and the feasibility of salinity detection was studied. The relationship between optical fiber signal and refractive index in water was deduced by using Fresnel formula. The change of optical fiber signal caused by salinity was calculated from the relationship between salinity and refractive index in water and the corresponding data table. An experimental setup was set up to experiment on 20 kinds of solutions with different salinities. Fiber fingerprints and volume-based fingerprints of 20 solutions were obtained. The analysis results show that with the increase of salinity in water, the optical fiber signal value increases continuously. The linear and quadratic polynomial salinity detection models were established by using the average of four drops of optical fiber signals. The error of the two models was compared. The results showed that the detection error of the linear model was smaller and the effect was better. The maximum detection error was 0.37%.