The measurement of fluid pressure inside pores is a major challenge in experimental studies of two-phase flow in porous media. In this paper, we describe the manufacturing procedure of a micro-model with integrated fibre optic pressure sensors. They have a circular measurement window with a diameter of 260 $$\upmu \hbox {m}$$μm, which enables the measurement of pressure at the pore scale. As a porous medium, we used a PDMS micro-model with known physical and surface properties. A given pore geometry was produced following a procedure we had developed earlier. We explain the technology behind fibre optic pressure sensors and the procedure for integrating these sensors into a micro-model and demonstrate their utility for the measurement of pore pressure under transient two-phase flow conditions. Finally, we present and analyse results of single and two-phase flow experiments performed in the micro-model and discuss the link between small-scale fast pressure changes with pore-scale events.

中文翻译：

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制造带有集成光纤压力传感器的微型模型

孔隙内流体压力的测量是多孔介质中两相流实验研究的主要挑战。在本文中，我们描述了带有集成光纤压力传感器的微型模型的制造过程。它们有一个直径为 260 $$\upmu \hbox {m}$$μm 的圆形测量窗口，可以在孔隙尺度上测量压力。作为多孔介质，我们使用了具有已知物理和表面特性的 PDMS 微模型。按照我们之前开发的程序生成给定的孔几何形状。我们解释了光纤压力传感器背后的技术以及将这些传感器集成到微模型中的过程，并展示了它们在瞬态两相流条件下测量孔隙压力的实用性。最后，