Phononic-fluidic cavity sensors for high-resolution measurement of concentration and speed of sound in liquid solutions and mixtures

Abstract A phononic-fluidic cavity sensor is a new type of acoustic fluid to measure volumetric liquid properties. In our work, it consists solid-air 3D phononic crystal (PnC) layers confining fluidic resonator generate strong, well separated resonance within the band gap. This allows for measurement changes in speed sound analyte with very high, linear sensitivity. this we present theoretical and experimental results sensitive determination sodium chloride glucose concentrations aqueous solutions. The 3D-printed cell rectangular chamber surrounded by an optimized PnC simple cubic ball beam design acting as metamaterial combining Bragg local scattering create optimal boundary conditions resonator. Analytical transmission line modeling used illustrate working principle sensor. Numerical finite element models describe structure behavior, frequency response at different mass fractions sample solutions validation experiments. high sensitivity concentration subsequently demonstrated over large range 0%–30%.