In rheology, torsionally vibrating quartz crystals are in use to determine dynamic shear moduli of liquids in the sonic and ultrasonic frequency range. A computer controlled measuring system using such crystals is described. The main advantages of this system are high measuring speed with respect to the manual AC bridge method and on-line data reduction. As an illustration measurements of a solution of polystyrene in toluene in the 10-100 kHz range are presented.
Beukema, G. J., & Mellema, J. (1981). Measuring system for complex shear modulus of liquids using torsionally vibrating quartz crystals. Journal of physics E: scientific instruments, 14(4), 418. https://doi.org/10.1088/0022-3735/14/4/006