عنوان مقاله [English]
Quartz crystal is a piezoelectric material and due to the inverse piesoelectric effect, applying an AC voltage to this crystal makes the crystal to vibrate. The natural frequency of these forced vibrations varies with the application of mechanical stresses, and temperature change in the crystal. In this article, a digital resonator force sensor was designed and simulated. This new force sensor has two working mode. In the first mode, the sensitivity of the sensor to the applied force is maximum, and in the second mode, the temperature error of the sensor is reduced. The sensor output in these working modes was simulated by a numerical-mathematical model. The model was verified by experimental data in previous literature. The effect of force azimuth angle, and length of loading edges at the crystal, were evaluated on both working modes.
The possibility of making measurements in two working modes leads to the increase of measurement resolution, by increase in sensitivity, and also the increase of measurement accuracy, by decreasing the thermal error on the sensor.