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Angular rate sensor

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Rate Sensors.

== Rate Sensors ==


Rate Sensors are the devices that directly (without integration in conditional electronics) measure angular rate. Gyroscopes also measure angular rate. Generally gyroscopes are able to measure constant rate of rotations, while rate sensors also include devices with low cut off frequency that is other than zero. Main technologies for Rate Sensors:

• Electromechanical (various types),

• MEMS,

• Laser (RLG).

• Fiber optic,

• Sensors built on utilizing MHD effect, and

• Electrochemical (MET) sensors.

There are two types of MET rate sensors that directly measure angular rate: one that is able to measure constant angular rate (DC sensitive) and the one that is not.

Non DC sensitive angular rate sensor has design of a toroid filled with a special electrolyte that moves when the device is rotated about its sensitive axis. When it happen 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. The lower level of measurements could be as low as 0.005 Hz.

DC sensitive angular rate sensor or gyroscope has more complex design and uses measurement of carioles acceleration to come up with angular rate.

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