光纤O2敏感探头的制备与性能测试

通过对多孔光纤修饰Ru配合物掺杂的敏感膜,制备了一种O2光纤传感探头。该探头结构基于简单的多孔光纤,内部设有贯穿的微孔道作为敏感材料的载体以及微传感池,在微孔道内完成传感过程。通过沉积凝胶膜修饰敏感层,即将含有Ru(dpp)3]2+的溶胶直接吸入光纤内部,在光纤微孔阵列中形成高分子敏感膜。传感过程基于荧光淬灭原理,由于O2对敏感膜中的Ru(dpp)3]2+具有强烈的荧光淬灭作用,传感探头对于不同浓度的O2表现不同的荧光强度。实验结果表明:设计的探头对于0～100%浓度的O2呈线性响应,灵敏度I0/I100值为9.4,探头在50ms内即可做出快速响应。实验还显示,实验值与真值的误差小于3%,常压下的检测分辨率可以达到2%。

Preparation and performance testing of fiber-optic O2 sensitive probe

An oxygen optical sensing probe was fabricated by modifying the sensitive film doped with Ru compounds in a holy optical fiber. The structure of this probe was based on the simple holy optical fiber with internal microchannel structure throughout the whole fiber, in which the microchannel structure could be used as a carrier of sensitive materials and a micro-sensing pool and the sensing process was finished in it. The sensing film was deposited in the optical fiber by inhaling the cellulose solution containing ［Ru(dpp)3］2+ directly. Furthermore, the sensing process was based on fluorescence quenching process. As the oxygen could strongly quench the fluorescence of ［Ru(dpp)3］2+ in the sensitive film, the sensing probe could exhibit different fluorescence intensities for different oxygen concentrations. The experimental results show that the designed probe responses to the oxygen in linearity for a full concentration range of 0～100% , and the ratio of I0/I100 (where I0 and I100 respectively represent the fluorescence intensities of the optrode exposed to 100% N2 and 100% O2) is 9.4. Simultaneously, the probe can make a quick response within 50 ms. The experiment also show that the error between experimental value and real value is less than 3% and the resolution can be 2% in a normal pressure.