Comparative study of different output metrics for a three weakly coupled resonator sensor

This paper, for the first time, investigates the characteristics of different output metrics for a three degreeof- freedom (DoF) coupled resonator sensor. The main aspects examined are sensitivity and linear range. It is shown from theoretical estimations, equivalent RLC circuit model simulations and electrical measurements that using the vibration amplitude ratio as an output signal provides improved sensitivity and linearity range, compared to other methods such as shift in eigenstate, mode frequency or amplitude difference