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Modelling of Hysteresis and creep in SAW strain sensors

V. Kalinin

Proc. of 2014 IEEE Int. Frequency Control Symp., Taipei, Taiwan, 19-22 May 2014.


Shear strain transfer from a part surface to a SAW substrate is analyzed for a SAW strain sensor attached to the part by an elastic adhesive. An analytic expression for the strain transfer function is obtained. A viscoelasticity model for the adhesive is proposed that allows prediction of the shear strain sensor output as a function of time. The model gives good match of the theoretical values of creep/relaxation and hysteresis to those observed in SAW torque sensors.