MEMS Gyroscope
A vibrating gyroscope fabricated using microelectromechanical systems technology. It exploits the Coriolis force effect, with micron-scale sensing structures patterned on a silicon wafer through silicon micromachining, to measure angular velocity. Its defining characteristics are small size, low power consumption, and suitability for batch manufacturing.
Timeline (last 90 days)
MEMS gyroscopes use a vibrating scheme, in which a proof mass microfabricated from silicon vibrates at high frequency under the action of drive electrodes, and when rotating, the Coriolis force deflects the vibration direction, with the angular velocity calculated by detecting changes in capacitance.
The drive frequency of a MEMS gyroscope is usually chosen near the structural resonant frequency to amplify the response.
Deep reactive ion etching (DRIE) uses alternating etching and passivation steps to etch high-aspect-ratio vertical structures into silicon wafers, and is a core process in the manufacture of MEMS gyroscopes.
If packaging stress is not well controlled, it will deform the silicon structure, causing the gyroscope's zero bias to drift with temperature or time.
The bias stability of MEMS gyroscopes is usually far lower than that of fiber-optic gyroscopes and ring laser gyroscopes, and high-precision scenarios such as submarines and aerospace still rely on larger-volume optical gyroscopes.
The bias stability of consumer-grade MEMS gyroscopes may be a few degrees to tens of degrees per hour, while fiber-optic gyroscopes can achieve 0.01°/h or even lower.
MEMS gyroscopes rely on detecting tiny capacitance changes, and their signals are weak and susceptible to temperature and stress interference; optical gyroscopes use the Sagnac effect, and the longer the optical path and the larger the area, the higher the sensitivity, so it is difficult to reduce their size.
The angle random walk of MEMS gyroscopes (which characterizes short-term noise) is usually greater than that of optical gyroscopes.
Semiconductor processes allow micron-scale beams, combs and electrodes to be fabricated in batches on silicon wafers, and a single tape-out can produce hundreds or thousands of MEMS sensing structures.
MEMS gyroscopes are especially sensitive to the stability of drive amplitude, quadrature coupling errors and temperature drift, all of which directly affect bias precision.
All Facts (11)
现代消费级MEMS陀螺仪的角速度测量精度可达0.01°/s量级，采样率通常在1000Hz以上
80%UnverifiedMEMS gyroscopes use a vibrating scheme, in which a proof mass microfabricated from silicon vibrates at high frequency under the action of drive electrodes, and when rotating, the Coriolis force deflects the vibration direction, with the angular velocity calculated by detecting changes in capacitance.
50%UnverifiedThe drive frequency of a MEMS gyroscope is usually chosen near the structural resonant frequency to amplify the response.
50%UnverifiedDeep reactive ion etching (DRIE) uses alternating etching and passivation steps to etch high-aspect-ratio vertical structures into silicon wafers, and is a core process in the manufacture of MEMS gyroscopes.
50%UnverifiedIf packaging stress is not well controlled, it will deform the silicon structure, causing the gyroscope's zero bias to drift with temperature or time.
50%UnverifiedThe bias stability of MEMS gyroscopes is usually far lower than that of fiber-optic gyroscopes and ring laser gyroscopes, and high-precision scenarios such as submarines and aerospace still rely on larger-volume optical gyroscopes.
50%UnverifiedThe bias stability of consumer-grade MEMS gyroscopes may be a few degrees to tens of degrees per hour, while fiber-optic gyroscopes can achieve 0.01°/h or even lower.
50%UnverifiedMEMS gyroscopes rely on detecting tiny capacitance changes, and their signals are weak and susceptible to temperature and stress interference; optical gyroscopes use the Sagnac effect, and the longer the optical path and the larger the area, the higher the sensitivity, so it is difficult to reduce their size.
50%UnverifiedThe angle random walk of MEMS gyroscopes (which characterizes short-term noise) is usually greater than that of optical gyroscopes.
50%UnverifiedSemiconductor processes allow micron-scale beams, combs and electrodes to be fabricated in batches on silicon wafers, and a single tape-out can produce hundreds or thousands of MEMS sensing structures.
50%UnverifiedMEMS gyroscopes are especially sensitive to the stability of drive amplitude, quadrature coupling errors and temperature drift, all of which directly affect bias precision.
50%