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基于荧光强度比值法,设计了一种使用两种荧光染料的光纤温度传感器.实验中,罗丹明B和罗丹明110分别为对温度敏感和对温度不敏感的荧光传感物质,利用聚合物光纤来传导激发光及接收荧光.由于两种染料的荧光谱峰相距60nm,因此容易将二者对应的荧光谱分开.通过确定能代表两种染料的最优荧光光谱范围,获得具有良好线性度的温度-荧光强度标定曲线.实验研究了不同浓度的荧光染料对标定曲线的影响,当染料浓度为0.3g/L时,可获得0.28℃的最小均方误差及0.0128/℃的灵敏度.此外,该传感器还具备一定的抗光源扰动和抗荧光染料漂白的能力.
Based on the fluorescence intensity ratio method, an optical fiber temperature sensor using two kinds of fluorescent dyes was designed.In the experiment, rhodamine B and rhodamine 110 were respectively temperature-sensitive and temperature-insensitive fluorescent sensing materials, using polymer optical fiber To guide the excitation light and receive fluorescence.Due to the two fluorescent dye peaks 60nm away from each other, it is easy to separate the two corresponding fluorescence spectrum by determining the optimal fluorescence spectrum that can represent the two dyes to obtain a good linearity Temperature-fluorescence intensity calibration curve.The effects of different concentrations of fluorescent dyes on the calibration curve were studied experimentally, the minimum mean square error of 0.28 ℃ and the sensitivity of 0.0128 / ℃ were obtained when the concentration of dye was 0.3g / L. In addition, The sensor also has a certain anti-light disturbance and anti-fluorescent dye bleaching ability.