MEMS gyroscope and FOG have different working principles as for two main types of gyroscopes. They can be used in many fields, such as oil drilling, mining, aerospace, UAV, etc.
▪ MEMS gyroscope
MEMS is the abbreviation of Micro Electro Mechanical Systems, which is micro-electromechanical systems. This system is based on micro/nano technology. Microelectromechanical systems can collect and process data by themselves, and can output data.
The traditional gyroscope mainly uses the principle of conservation of angular momentum. We can understand it as a constantly rotating object. Its axis of rotation does not change and is not affected by the rotation of the object. MEMS gyroscope is very different. Since MEMS gyros are chip-based, its size is very small and it is impossible to create a rotating structure. Therefore, MEMS gyroscope is based on the Coriolis force, which refers to the tangential force experienced by a rotating object when it has radial motion. Like MG2-50/100 (https://www.ericcointernational.com/gyroscope/mems-gyroscope/er-mg2-100-north-seeking-mems-gyro.html) is specially designed for the ground navigation and MG2-300/400 (https://www.ericcointernational.com/gyroscope/mems-gyroscope/er-mg2-300-navigation-mems-gyro.html) is specially designed for air navigation.
▪ FOG
FOG is the abbreviation of Fiber Optic Gyroscope. FOG is a gyroscope that utilizes the Sagnac effect. Since FOG is based on optical principles, unlike traditional gyroscopes that rely on the momentum moment of the rotor to sense angular motion, FOG is also defined as a non-gyro angular motion sensor.
Based on the Sagnac effect, when an annular light path rotates in inertial space around an axis perpendicular to the plane of the light path, an optical path difference will occur between two columns of light waves propagating oppositely in the light path due to the inertial motion of the light waves, resulting in the coherence of the two beams. Interference of light waves. There is a certain internal relationship between the phase difference corresponding to the optical path difference and the rotation angular rate. By monitoring and demodulating the interference light intensity signal, the rotation angular rate can be determined.
You can read the reference: https://www.ericcointernational.com/application/mems-gyroscope-vs-fog-whats-the-difference-between-them.html

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