A compact microwave microfluidic sensor using a re-entrant cavity

Hamzah, Hayder, Abduljabar, Ali, Lees, Jonathan ORCID: https://orcid.org/0000-0002-6217-7552 and Porch, Adrian ORCID: https://orcid.org/0000-0001-5293-8883 2018. A compact microwave microfluidic sensor using a re-entrant cavity. Sensors 18 (3) , 910. 10.3390/s18030910

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Abstract

A miniaturized 2.4 GHz re-entrant cavity has been designed, manufactured and tested as a sensor for microfluidic compositional analysis. It has been fully evaluated experimentally with water and common solvents, namely methanol, ethanol, and chloroform, with excellent agreement with the expected behaviour predicted by the Debye model. The sensor’s performance has also been assessed for analysis of segmented flow using water and oil. The samples’ interaction with the electric field in the gap region has been maximized by aligning the sample tube parallel to the electric field in this region, and the small width of the gap (typically 1 mm) result in a highly localised complex permittivity measurement. The re-entrant cavity has simple mechanical geometry, small size, high quality factor, and due to the high concentration of electric field in the gap region, a very small mode volume. These factors combine to result in a highly sensitive, compact sensor for both pure liquids and liquid mixtures in capillary or microfluidic environments

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	MDPI
ISSN:	1424-8220
Date of First Compliant Deposit:	30 July 2018
Date of Acceptance:	5 March 2018
Last Modified:	22 Mar 2024 07:21
URI:	https://orca.cardiff.ac.uk/id/eprint/113568

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