Generally gyroscopes are able to measure a constant rotation rate, while rate sensors also include devices with a low cut off frequency that is other than zero.
A non–DC-sensitive angular rate sensor consists of a toroid filled with a special electrolyte that moves when the device is rotated about its measurement axis.
When this happens the electrolyte flows through the sensing element, which is rigidly fixed inside the channel, and the motion is detected.
The output signal is proportional to the angular rate due to internal integration that occurs inside of the sensing element.
A DC-sensitive angular rate sensor or gyroscope has a more complex design and uses measurement of Coriolis acceleration to determine angular rate.. Angular rate sensors are used in a variety of applications including vehicle handling, crash, biomechanics, and high-rate ballistics testing.