The fluorescence method dissolved oxygen sensor is based on the principle of fluorescence quenching. Blue light is irradiated onto the fluorescent substance to excite it and emit red light. Due to the quenching effect, oxygen molecules can take away energy, so the time and intensity of the excited red light are inversely proportional to the concentration of oxygen molecules. By measuring the lifetime of excited red light and comparing it with internal calibration values, the concentration of oxygen molecules can be calculated.
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