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Measurement of dissolved oxygen concentration field in a microchannel using PtOEP/PS film

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Abstract

A planar optode system based on an oxygen quenchable luminophore platinum (II) octaethyporphrin (PtOEP) bound with thin polystyrene (PS) film and UV light-emitting diodes (UV-LEDs) was developed to measure the dissolved oxygen (DO) concentration field in microscale water flows. An intensity-based method adopting a pixel-to-pixel in situ calibration technique was used to visualize DO concentration fields in a Y-shaped microchannel. The achievable spatial resolution of the acquired concentration map could be as high as 2.94 μm. The diffusion process of DO through the interface between two parallel water flows having different DO concentrations was quantitatively analyzed. We found that the thickness of the concentration gradient of DO increased as the Reynolds number decreased. The ratio of diffusion length scales coincided with the ratio of inner scales of viscous shear layers in the microchannel for two different Reynolds numbers.

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Acknowledgments

This work was supported by the National Research Foundation (NRF) of Korea through a grant funded by the Korean Government (No. 2010-0000448, No. K20702001648-10E0100-07010). This work was supported by the second phase of Brain Korea21 Project in 2010.

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  1. School of Mechanical Engineering, Pusan National University, Busan, 609-735, Republic of Korea

    Dae Hun Song, Hyun Dong Kim & Kyung Chun Kim

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  1. Dae Hun Song
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  2. Hyun Dong Kim
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  3. Kyung Chun Kim
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Correspondence to Kyung Chun Kim.

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Song, D.H., Kim, H.D. & Kim, K.C. Measurement of dissolved oxygen concentration field in a microchannel using PtOEP/PS film. J Vis 14, 295–304 (2011). https://doi.org/10.1007/s12650-011-0096-8

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  • DOI: https://doi.org/10.1007/s12650-011-0096-8

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