However, the MEMS gyroscopes suffer from the unreliability caused by the unstable mechanical structure. Micro electro-mechanical system (MEMS) gyroscopes 7 have gained a lot of attention for the small size. ![]() Because of ever increasing demands for gyroscope in the consumer electronics market, the major concern is on miniaturization and low cost. However, RLGs and IFOGs are expensive bulk sensors, resulting in the disadvantages of weight, footprint and power consumption. Majority of high-precision gyroscopes are based on the optical Sagnac effect 1 such as ring laser gyroscopes (RLGs) 2, 3 and interferometric fiber optic gyroscopes (IFOGs) 4, 5, 6, with sensitivities in the range of μdeg/s to thousand μdeg/s. Gyroscope is a kind of angular velocity sensor, which is widely used on airplanes, ships, cars and even mobile phones nowadays.
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