A cost-effective oxygen probe manufactured by simple fabrication processes

During the last decade, the development of different technologies for determining oxygen has undergone a great expansion in favour of industrial developments and the dilemmas it presents to engineering. Dissolved oxygen monitoring by colorimetry, and electrochemical sensors presents several difficulties for long-term application and without constant maintenance, which are partially solved by optical measurement technology. As part of the development of a low-cost sensor, with low energy consumption capable of taking gaseous and dissolved oxygen readings, we developed a low-cost sensor with an easy and fast manufacturing procedure based on PtOEP and PDMS membranes and a simple reading system based on led / photodiode system. This document reports an analysis of different thicknesses (0.1-2.5 mm), different solvents (toluene and THF), and indicator concentrations (363, 545, 727 ppm) and their relationship to the absorption spectrum. The response of the membranes in a controlled gaseous and liquid environment is also analyzed, from which it is possible to set the better sensitivity related to the most efficient membrane.