Low Power Solid-State Sensor Device

This invention describes the design of a novel sensor to quantify molecular Oxygen (O2) based entirely on solid-state electronics. A derivative compound of Ruthenium II has been found to exhibit luminescence of a very specific quality. Upon reacting with molecular O2, the characteristics of the luminescence are found to change (quenching). This technology detects the change and enables quantification of the amount of Oxygen present. The method involves:
Immobilizing the ruthenium complex within a porous sol-gel processed glass film Casting this film directly onto the surface of a blue quantum well light emitting diode (LED)
Excitation of the LED and of the ruthenium complex thereof Filtration of the emission from the ruthenium complex u sing a low cost acrylic color filter Detection of the emission with an inexpensive silicon photodiode The sensor responses to gaseous and dissolved oxygen have been studied extensively and inferences drawn with statistical rigor and accuracy. The v alue propositions observed are:
Fast Response Times Good Reversibility Detection limits and ranges of high quality (0.5%, 0.02% and 110 ppb respectively for O2 in the gaseous – linear Stern-Volmer and multi-site Sten-Volmer analysis- and aqueou phase)
This sensor provides a cost effective alternative to traditional electrochemical-based O2 sensing as also provides a platform for other optically-based sensors.

Categories: Sensors, Optics

Type of Offer: Licensing

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