Multiple inertial measurement units (IMUs) can be mounted on arms and legs for body tracking and monitoring. The yaw rate gyroscope can also be used for indoor robot control. This is called car dead-reckoning backup system. And a roll gyroscope can be used to activate airbags when a rollover condition happens.Ī yaw rate gyroscope can be used in cars to measure the orientation to keep the car moving on a digital map when GPS signal is lost. A yaw rate gyroscope can be used in cars to activate the electronic stability control (ESC) brake system to prevent accidents from happening when the car is making a sharp turn. Digital cameras use gyroscopes to detect hand rotation for image stabilization. MEMS gyroscopes can measure angular velocity.
The gyroscope will output zero-rate level of voltage or LSBs, which shows that the MEMS gyroscopes are not sensitive to linear acceleration such as tilt, shock, or vibration.įigure 2. Therefore, there will be no capacitance difference detected. When linear acceleration is applied to two masses, they move in the same direction. This differential value in capacitance is proportional to the angular velocity Ω > and is then converted into output voltage for analog gyroscopes or LSBs for digital gyroscopes. When angular velocity is applied, the Coriolis force on each mass also acts in opposite directions, which result in capacitance change. Two masses oscillate and move constantly in opposite directions (Figure 2). Most available MEMS gyroscopes use a tuning fork configuration. And the resulting physical displacement caused by the Coriolis force is then read from a capacitive sensing structure. When a mass (m) is moving in direction v→ and angular rotation velocity Ω→ is applied, then the mass will experience a force in the direction of the arrow as a result of the Coriolis force. MEMS gyroscopes use the Coriolis Effect to measure the angular rate, as shown in Figure 1. They are mass produced at low cost with small form factor to suit the consumer electronics market. MEMS gyroscopes are making significant progress towards high performance and low power consumption. Here, we discuss the methods and techniques of quickly getting meaningful information from a MEMS gyroscope in terms of angular velocity and angular displacement measurements.
Further applications such as dead reckoning and GPS assistance that require high sensitivity, low noise, and low drift over temperature and time are on the horizon.
#How does gyroscope work portable
MEMS gyroscopes have enabled exciting applications in portable devices including optical image stabilization for camera performance improvement, user interface for additional features and ease of use, and gaming for more exciting entertainment. The significant size reduction of multi-axis MEMS gyroscope structures and their integration with digital interface into a single package of a few square millimeters of area at an affordable cost have accelerated the penetration of MEMS gyroscopes into hand-held devices.
#How does gyroscope work how to
(November 15, 2010) - Jay Esfandyari, Roberto De Nuccio, Gang Xu, STMicroelectronics, introduce how MEMS gyroscopes work and their applications, the main parameters of a MEMS gyroscope with analog or digital outputs, practical MEMS gyroscope calibration techniques, and how to test the MEMS gyroscope performance in terms of angular displacement.