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报道了一种基于荧光猝灭原理的光纤氧气传感器.采用塑料光纤作为传感和传光元件进行氧气传感,传感头制成U形.以邻菲咯啉钌作为荧光标记物,用溶胶-凝胶法制备敏感材料.采用相移法来实现对荧光寿命的测定.测量了不同弯曲半径传感头对氧气传感的灵敏度,发现当U形光纤的弯曲半径较小时系统的灵敏度较高.对荧光寿命和氧气浓度的关系进行了测量,发现二者呈亚线性关系,提出双荧光体模型解释这一实验现象.
An optical fiber oxygen sensor based on the principle of fluorescence quenching is reported. Oxygen sensing is performed using plastic optical fiber as the sensing and light transmitting element, and the sensing head is made into a U shape. The ruthenium phenanthroline is used as a fluorescent marker, - Gel method for the preparation of sensitive materials.Determination of fluorescence lifetime was achieved by the phase shift method.The sensitivities of different bending radius sensors to oxygen sensing were measured and it was found that the sensitivity of the system was higher when the bending radius of U- The relationship between fluorescence lifetime and oxygen concentration was measured and found to be sub - linear, and a dual phosphor model was proposed to explain this phenomenon.