Tunable resonators in the low kHz range for viscosity sensing

► Two resonating sensors. ► Both of them can be detuned in a range of over one decade ranging from 1 kHz to over 10 kHz approximately. ► Closed form model for both types of sensors ► Good response to viscosity. ► Comparison of both sensors and discussion of their benefits. ► New setups improving drastically the sensor's stability.