The use of optical sensors for oxygen measurement is becoming more important because of their capability for low-cost and direct measurement, but as yet, little has been reported about their long-term performance. Phosphorescent sensors based on platinum octaethylporphyrin (PtOEP) embedded in polymer matrices tend to degrade with time. To reduce the rate of degradation, sensor films were fabricated and then coated with a layer of polydimethylsiloxane (PDMS) and tested in a six-month study. The PDMS-coated sensors showed an average degradation rate of ~0.073 %/day, compared to ~0.18 %/day for uncoated sensors. Titania beads were also incorporated into the films to increase light scattering and improve the response; these beads compensated to some degree for the absorption due to the PDMS films. The films with titania beads improved the response significantly (about 40%) compared to the films without titania beads. Incorporation of titania beads also moderately improved the aging characteristics.

由于光学传感器具有低成本和直接测量的能力，因此将光学传感器用于氧气测量正变得越来越重要，但迄今为止，关于其长期性能的报道很少。嵌入聚合物基质中的基于八辛基卟啉铂（PtOEP）的磷光传感器往往会随着时间而退化。为了降低降解速度，先制作了传感器膜，然后在膜上涂了一层聚二甲基硅氧烷（PDMS），并进行了为期六个月的研究测试。涂有PDMS的传感器的平均降解率为〜0.073％/天，而未涂膜的传感器的平均降解率为〜0.18％/天。二氧化钛珠也被掺入薄膜中以增加光散射并改善响应。这些珠粒在某种程度上补偿了由于PDMS膜引起的吸收。与没有二氧化钛珠的膜相比，具有二氧化钛珠的膜显着改善了响应（约40％）。掺入二氧化钛珠也适度改善了老化特性。