Science-Specialists.com: Integrated Scientific Specialists - News: Fluorescence D.O. What exactly means? A fluorescent dye is stimulated in the membrane of the FDO® cap by a short wave length lightsource. By falling back into the passive state, long wave light is emitted, which is recorded as a measurement signal.If oxygen contacts the dye by diffusing through the membrane the period of back scattering light is shortened according to the oxygen concentration of the sample. The following technologies are used:IQMC TechnologyEach cap is individually factory calibrated. The calibration data are permanently stored on a chip which is installed in the membrane cap. EPRS (Equal Path Reference System)Measuring and reference path as well as optical components are identically designed with this sensor.Natural aging processes of the optical components cantherefore be compensated by the reference path andaccordingly compensated in the measuring path. Thiscauses a continuous high performance of the sensor. GLT (Green-light Technolgy)By stimulating the fluorescent reaction in the membrane with low energetic green-light, a bleeching of the fluorescentdye in the sensor membrane is avoided. This leads to a membrane lifetime of min. 2 years. C2 calibration:The optical measuring technology is based on a attenuated fluorescent signal in a defined time frame. To process this time measurement as precise as possible, the sensor optics are calibrated to the speed of light. This natural constant “c” is defined as the time that a light beam needs to go from one point to another.The sensor is precisely calibrated against a physicalconstant. The interaction of these technologies makes the FDO® a non-calibration sensor.

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