Oxygen Sensors -- Fluorescence Quenching
Our oxygen sensors use the quenching of fluorescence by collision of molecular oxygen with a fluorophore that is trapped in an oxygen permeable polymer. This technique is superior to electrodes, in that O2 is not consumed. The sensing material can be put on the tip of an optical fiber, or made as a thin film on flat substrates (patches). We have a variety of sizes and shapes but they all work by the same principle. The NEOFOX "reader" is a phase fluorometer, which pulses a blue LED and measures the red fluorescence lifetime (tau) of the return signal. There are two chemistries available, ZERO-DRIFT AP for general purpose use in gases and aqueous based samples, and HCR for use in aggressive hydrocarbon solvents.
ZERO-DRIFT AP Chemistry This is our best sensor yet! Our breakthrough multi-layered formulation has virtually no drift due to photo-bleaching. It is not influenced by water vapor, and so it can be calibrated in gases and used without error in liquids. It is very resistant to prolonged exposure to elevated storage and operating temperatures.
HCR Chemistry HCR is formulated to work in organic solvents, which interfere with standard formulations. It features excellent adhesion in alcohols, jet fuels, toluene, acetone and many other hydrocarbons. We can test our probe in your solvent to validate its use. Just give us a call.