Oxygen detection techniques are essential for marine environment and ecology researches. In this paper, the
development of luminescence intensity-based sensor system for dissolved oxygen (DO) measurement is presented. The
sensor film consists of tris(2,2-bipyridyl)ruthenium(II) (Ru(bpy)3Cl2) as photosensitive indicator which is immobilized
within the mixture of tetraethoxylsiane (TEOS) and methyl triethoxysilane (MTEOS) membrane. The laboratory
experimental results show that the ratio of the fluorescence intensity of the sensor correlates well with DO concentration
from 0 to 32.96 mg/l. Depending on the charge-coupled device (CCD) camera used, the proposed system can monitor the
0.9×0.9 cm areas with 9×9 μm resolutions and it can be used for oxygen distribution measurement in spatial and
temporal scale for undersea monitoring applications.