A 2-axis gyroscope with a synchronously-driven dual mass

We report a detuned 2-axis yaw-and-roll gyroscope with a single sensor element. We designed and fabricated a novel structure composed of a synchronously driven dual mass and three types of supporting beams to limit the movable direction of each mass. The designed resonant frequencies agreed well with the measured values, which resulted in 2-axis detuning ratios of -0.7 and -2.2%. The fabricated gyroscope showed a cross-axis sensitivity of +/-2.7%. The test results demonstrated that the gyroscope simultaneously detects yaw and roll rates with low cross-axis sensitivity.