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提出了利用光纤倏逝波传感器通过光吸收方法来测量溶液中磷酸根离子浓度的新方法。将通信用标准单模光纤(SMF)局部腐蚀到接近芯层后放入不同浓度的磷钼蓝溶液中,当以磷钼蓝光吸收峰值为探测光波长时,光纤表面的倏逝波会部分被溶液吸收,通过测量光纤输出光强来计算溶液中的磷酸根离子浓度。实验结果表明,磷钼蓝溶液中磷浓度为0.04～0.40mg/L范围内,溶液的吸光度与磷浓度近似成线性关系,探测灵敏度为0.53L/mg,线性相关系数为0.918。基于光纤技术的传感器件结构紧凑、制作简单、成本低,有利于实现传感器的微型化。
A new method for measuring the concentration of phosphate ions in solution by optical absorption spectroscopy using optical fiber evanescent sensors was proposed. The standard single-mode optical fiber (SMF) for communication is locally etched into the near-core layer and then put into different concentrations of phosphomolybdate blue solution. When the absorption peak of phosphomolybdenum blue is used as the detection wavelength, the evanescent wave of the optical fiber surface will be partially The solution is absorbed and the phosphate ion concentration in the solution is calculated by measuring the optical output power of the fiber. The experimental results showed that the phosphorus concentration in the phosphomolybdenum blue solution ranged from 0.04 to 0.40 mg / L, and the absorbance of the solution was approximately linear with the phosphorus concentration. The detection sensitivity was 0.53 L / mg and the linear correlation coefficient was 0.918. The sensor device based on optical fiber technology has the advantages of compact structure, simple manufacture and low cost, and is favorable for miniaturization of the sensor.