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Microfluidic systems with integrated sensors are ideal platforms to study andemulate processes such as complex multiphase flow and reactive transport inporous media, numerical modeling of bulk systems in medicine, and inengineering. Existing commercial optical fibre sensing systems used inintegrated microfluidic devices are based on single-core fibres, limiting thespatial resolution in parameter measurements in such application scenarios.Here, we propose a multicore fibre-based pH system for in-situ pH mapping withtens of micrometer spatial resolution in microfluidic devices. Thedemonstration uses custom laser-manufactured glass microfluidic devices (calledfurther micromodels) consisting of two round ports. The micromodels comprisetwo lintels for the injection of various pH buffers and an outlet. The two-portsystem facilitates the injection of various pH solutions using independentpressure pumps. The multicore fibre imaging system provides spatial informationabout the pH environment from the intensity distribution of fluorescenceemission from the sensor attached to the fibre end facet, making use of thecores in the fibre as independent measurement channels. As a proof-of-concept,we performed pH measurements in micromodels through obstacles (glass and rockbeads), showing that the particle features can be clearly distinguishable fromthe intensity distribution from the fibre sensor.

In-situ multicore fibre-based pH mapping through obstacles in integrated microfluidic devices