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. 2016 Aug 26;10(4):044111. doi: 10.1063/1.4955155

FIG. 4.

FIG. 4.

Characterization curves of the pH sensor. (a) Effect of the channel height on the level of absorption detected by the photodiode, (b) step experiment to show the sensitivity of the pH sensor built in a channel with a height of 0.5 mm, (c) calibration curve of the pH sensor with a channel height of 0.5 mm, (d) effect of flow rate on the sensitivity of the pH sensor; tests done using a solution with a pH of 7.4. Error bars for different points of (c) and (d) are less than ±0.002 and not visible on figures.