If a gyro has only one gimbal ring, with consequently only one plane of freedom, it can be adapted for use as a rate gyro to measure a rate of angular movement.
Rate gyros are used in rate integrating gyroscopes, and in attitude control systems for vehicles, and in combination with other sensors to make inertial navigation systems.
The traditional type of rate gyro employs relatively conventional gyroscopes with viscous couplings to transfer the spin rate to allow it to be read.
[1][2] MEMS gyros are cheap and have no moving parts.
[citation needed] They often work by sonic resonance effects driven by piezoelectric transducers, that provide a signal when a rotation occurs.