Non-invasive pressure sensing in microfluidic chips using laser interferometry

Asm Kamruzzaman; Yusuf A. Koksal; Xiaolong Yin; Hossein Kazemi; Erdal Ozkan; Necati U. Kaya

doi:10.1117/12.2514391

18 March 2019 Non-invasive pressure sensing in microfluidic chips using laser interferometry

Asm Kamruzzaman, Yusuf A. Koksal, Xiaolong Yin, Hossein Kazemi, Erdal Ozkan, Necati U. Kaya

Proceedings Volume 10973, Smart Structures and NDE for Energy Systems and Industry 4.0; 109730M (2019) https://doi.org/10.1117/12.2514391
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

Precision fluid pressure detection in microfluidics is challenging due to the restricted accessibility for integration of pressure sensors. We propose an adapted geometric laser interferometry technique capable of sensing changes in fluid pressure within the microfluidic chips noninvasively. In the past, similar interferometric approaches have been proposed for pressure determination in microfluidic devices; in this study, we experimented a different setup. We allowed a heliumneon laser beam to propagate through the air filled microchannels. We then captured the interference of the reflected waves from the microchip using a high-resolution camera sensor as bright and dark fringes, for applied pressures of 1-10 psi. These fringes shift with changes in air pressure inside the microchannels, and they (fringe shift) are interpreted as related to the changing air index of refraction and density. The use of optical interferometry for microfluidic pressure measurements is limited at this point; however, it is highly promising.

Conference Presentation

Citation Download Citation

Asm Kamruzzaman, Yusuf A. Koksal, Xiaolong Yin, Hossein Kazemi, Erdal Ozkan, and Necati U. Kaya "Non-invasive pressure sensing in microfluidic chips using laser interferometry", Proc. SPIE 10973, Smart Structures and NDE for Energy Systems and Industry 4.0, 109730M (18 March 2019); https://doi.org/10.1117/12.2514391

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