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Calibration result of oxygen sensor under aqueous environments. After changing the oxygenation condition of liquid inside the channel, the sensor intensity is allowed to stabilize over a period of 3 min. (a) Output signal (voltage) versus time as a function of oxygen concentration in the liquid-filled microchannels for different oxygen concentrations using a typical PtOEPK sensor. (b) Dimensionless output sensor intensity versus DO levels, as defined by the Stern−Volmer relation.
