Acousto-optic method for quality control of water mixed with miscible liquids

In this work, an acousto-optic (AO) method was developed to control the quality of water mixed with miscible liquids such as acetone and ethanol. A collimated laser beam passing through a transparent binary solution was diffracted by acoustic waves. It was proved that location of diffraction orders in a diffraction pattern was dependent on velocity of ultrasound while the velocity itself was determined by concentration of the solutions. We also found that acoustic impedances of the binary solutions have an influence on the diffraction efficiency. Finally, we noticed that measured dependences of the velocities and the diffraction efficiencies on the liquid concentrations were non-linear and symmetrical with respect to each other.

► Acousto-optical method was developed to control water adulteration by solvents.
► Variation of miscible liquid has a non linear effect on the diffraction efficiency.
► Increasing solvent concentration affects the location orders non linearly.
► Both diffraction parameters are symmetrical with each other, depending on concentration.
► Measurement sensitivity depends mainly on the detection set resolution.