Application

Brief Introduction Of MEMS Gyroscope

Working principle of micromechanical gyroscope
The basic principle of MEMS gyroscopes is to use nanocrystal gyroscopes (MEMS core left) in MEMS systems to detect, measure, and interpret changes in angular acceleration and angular velocity. The characteristics of MEMS crystal gyro will oscillate with the change of external angular velocity. The rotor of nanocrystalline gyro in MEMS gyro will produce mechanical vibration with the change of external angular acceleration and angular velocity. MEMS gyroscope is a micro-mechanical angular velocity sensor based on micro-electro-mechanical system (MEMS) technology. It is a fast, accurate and compact sensor that can be used to measure and sense changes in angular acceleration and angular velocity.

Conventional mechanical gyroscopes mainly use the principle of conservation of angular momentum, that is, for a rotating object, its axis of rotation does not change with the rotation of the bracket carrying it. The MEMS gyroscope mainly utilizes the principle of Coriolis force (the tangential force of a rotating object when it has radial motion). The disclosed micromechanical gyroscope adopts the concept of the angular velocity of the vibrating object, and uses vibration to induce and detect. Coriolis force.

At the heart of the MEMS gyroscope is a micromachined mechanical unit that is designed to resonate in accordance with a tuning fork mechanism to convert the angular rate into a displacement of a particular sensing structure using the Coriolis force principle. Taking a single-axis offset (yaw, YAW) gyroscope as an example, the simplest working principle is explored through Tuli.

Two identical masses oscillate horizontally in opposite directions, as indicated by the horizontal arrow. When an angular rate is applied externally, a Coriolis force appears, the direction of the force being perpendicular to the direction of mass motion, as indicated by the vertical arrow. The resulting Coriolis force shifts the sense mass, which is proportional to the magnitude of the angular rate applied. Since the moving electrode (rotor) of the sensing portion of the sensor is located on the side of the fixed electrode (stator), the above displacement will cause a change in capacitance between the stator and the rotor, and therefore, the angular rate applied at the input portion of the gyroscope is Converted into a dedicated circuit to detect the electronic parameters --- capacitance.

Performance parameter

The important parameters of MEMS gyroscope include: Resolution, zero angular velocity output (zero output), Sensitivity and measurement range. These parameters are important indicators to judge the performance of MEMS gyroscopes, and also determine the application environment of gyroscopes.
The resolution is the minimum angular velocity that the gyroscope can detect, and this parameter and the zero angular velocity output are actually determined by the gyroscope's white noise. These three parameters mainly explain the internal performance and anti-interference ability of the gyroscope. For the user, the sensitivity has more practical selection significance. The measuring range refers to the maximum angular velocity that the gyroscope can measure. Different applications have different requirements for various performance indicators of gyroscopes.As a high performance MEMS gyro sensor ,ER-MG2-50/100 with 0.01-0.02°/hr bias instability and 0.0025-0.005°/√hr Angular Random Walk,stands out from the competition in the gyroscope market with high precision angular velocity output and sensitivity, and is specially designed for north seeking, pointing, initial alignment in logging tools/gyro tools, mining/drilling equipment, weapon/UAV launch systems, satellite antenna,target tracking system and so on.

If you want to get more details about MEMS gyroscope, pls visit https://www.ericcointernational.com/gyroscope/mems-gyroscope/

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