Highly Sensitive Measurement of Liquid Density in Air Using Suspended Microcapillary Resonators
AbstractWe report the use of commercially available glass microcapillaries as micromechanical resonators for real-time monitoring of the mass density of a liquid that flows through the capillary. The vibration of a suspended region of the microcapillary is optically detected by measuring the forward scattering of a laser beam. The resonance frequency of the liquid filled microcapillary is measured for liquid binary mixtures of ethanol in water, glycerol in water and Triton in ethanol. The method achieves a detection limit in an air environment of 50 µg/mL that is only five times higher than that obtained with state-of-the-art suspended microchannel resonators encapsulated in vacuum. The method opens the door to novel advances for miniaturized total analysis systems based on microcapillaries with the add-on of mechanical transduction for sensing the rheological properties of the analyzed fluids without the need for vacuum encapsulation of the resonators. View Full-Text
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Malvar, O.; Ramos, D.; Martínez, C.; Kosaka, P.; Tamayo, J.; Calleja, M. Highly Sensitive Measurement of Liquid Density in Air Using Suspended Microcapillary Resonators. Sensors 2015, 15, 7650-7657.
Malvar O, Ramos D, Martínez C, Kosaka P, Tamayo J, Calleja M. Highly Sensitive Measurement of Liquid Density in Air Using Suspended Microcapillary Resonators. Sensors. 2015; 15(4):7650-7657.Chicago/Turabian Style
Malvar, Oscar; Ramos, Daniel; Martínez, Carmen; Kosaka, Priscila; Tamayo, Javier; Calleja, Montserrat. 2015. "Highly Sensitive Measurement of Liquid Density in Air Using Suspended Microcapillary Resonators." Sensors 15, no. 4: 7650-7657.