Oxygen Sensors -- Fluorescence Quenching
Our O2 (molecular oxygen) sensors use the quenching of fluorescence by collision of molecular oxygen with a fluorophore that is trapped in an oxygen permeable sol gel or polymer. This technique is superior to polarographic electrodes in that O2 is not consumed. The sensing material can be coated on the tip of an optical fiber, or deposited as a thin film on flat substrates (patches and probe caps). 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 decay lifetime (tau) of the return signal. There are three chemistries available, ZERO-DRIFT AP for general purpose use in gases and aqueous based samples, MR hydrophobic sensor designed for fast response in gases, and HCR for use in aggressive hydrocarbon solvents such as toluene, alcohol, acetone and aviation fuels.
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 It is very resistant to prolonged exposure to elevated storage and operating temperatures. The matrix is polystyrene which provides excellent adhesion to plastic optical fibers and acrylic substrates.
HCR Chemistry HCR is our breakthrough sensor material that works in aggressive hydrocarbon organic solvents. These materials dissolve and or poison all other sensor materials in the market. It features excellent adhesion and resistance to 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.
MR Chemistry MR sensors are based on very hydrophobic sol gels, so the influence of water vapor on readings is eliminated without any degradation in response rate. It is ideal for measuring pO2 in gas mixtures where fast response is required.