Oxygen detection by fluorescence quenching of tetraphenylporphyrin immobilized in the original cladding of an optical fiber
Oxygen detection by fluorescence quenching of tetraphenylporphyrin immobilized in the original cladding of an optical fiber
复制标题
DOI：
10.1016/s0003-2670(98)00248-7
复制
发表时间：
1998-08-31
影响因子：
6.2
通讯作者：
Hieftje, GM
中科院分区：
文献类型：
--
作者：
Potyrailo, RA;Hieftje, GM
研制了一种新型光纤氧传感器。四苯基卟啉（TPP），嵌入到传统的低成本塑料包层石英光纤的原始分析物可渗透的包层中，由在光纤中传播的倏逝波激发;产生的荧光被捕获回光纤的导模中，并且可以在任一端检测到。周围介质中的氧淬灭荧光，并通过Stern-Volmer表达式进行定量。用超亮（13000 mcd）黄色590 nm发光二极管（LED）实现激发，在650 nm处监测发射。新传感器在测量的氧分压范围（55-760 Ω）内具有出色的精度（相对标准偏差（RSD）为0.1-0.2%），响应时间为1 s，氧的检测限为3.5 Ω，猝灭常数为7.5x10（-4）Ω（-1）。与早期的氧传感器不同，新设备不受测量气体样品相对湿度变化的影响。TPP的短（10 ns）荧光寿命和制造连续的化学敏感纤维数百米长的可能性，使传感器有吸引力的应用，需要空间分辨的氧气映射在大型偏远地区。(C)1998 Elsevier Science B. V.保留所有权利。
A new fiber-optic sensor for oxygen has been developed. Tetraphenylporphyrin (TPP), embedded into the original analyte-permeable cladding of a conventional low cost plastic-clad silica optical fiber, is excited by the evanescent-wave traveling in the fiber; the resulting fluorescence is captured back into the guided modes of the fiber and can be detected at either end. Oxygen in the surrounding medium quenches the fluorescence and is quantified by means of the Stern-Volmer expression. Excitation was achieved with an ultra-bright (13000 mcd) yellow 590 nm light-emitting diode (LED), with emission monitored at 650 nm. The new sensor offers excellent precision (relative standard deviation (RSD) of 0.1-0.2%) over the range of measured oxygen partial pressures (55-760 torr), a response time of 1 s, a detection limit of 3.5 torr of oxygen, and a quenching constant of 7.5x10(-4) torr(-1). Unlike earlier oxygen sensors, the new device is immune to changes in relative-humidity of measured gaseous samples. The short (10 ns) fluorescence lifetime of TPP and the possibility to fabricate continuous chemically sensitive fibers hundreds of meters long make the sensor attractive in applications that require spatially resolved oxygen mapping over large remote areas. (C) 1998 Elsevier Science B.V. All rights reserved.