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Mems gyroscope
This document summarizes a MEMS gyroscope that uses the Coriolis effect and thermal properties to measure angular velocity. It operates by creating a temperature difference and temperature gradient within a material such as air when subjected to rotation, which is detected by pressure sensors instead of temperature sensors. The document includes the operating principle, a model of the gyroscope using air as the material, details of the mesh size, and results showing the correlation between angular velocity and the measured pressure difference.
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Mems gyroscope
- 1. MEMS Gyroscope NemishKanwar 2012A4PS305P Akershit Agarwal 2012A4PS340P Varun P Sharma 2012A4PS294P
- 2. Gyroscope ● Tomeasure Angular Velocity/Acceleration
- 3. Move To MEMS ● Small Size, Low Cost, Low Weight ● High Accuracy
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- 6. Thermal Gyroscope ●Temperature Difference ● Coriolis Force ● Temperature gradient in other direction
- 7. Modification ● Inletand Outlet for air ● Air flow due to Pressure Difference ● Pressure sensors used instead of temperature sensors ● Linear acceleration not taken into account
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- 10. MODEL Inlet NormalInflow Velocity= 1 μm/s Outlet Pressure= 0 Pa Volume force
- 11. MODEL MESH Size:0.03-0.1 micrometer
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- 14. Conclusion Correlation Result ω=3.8e11*ΔP-2.3e7 ● High Slope ● Theoretical Model
Editor's Notes
- #5 Helps in Positioning of Spacecraft Helps in detection of Yaw Rate, thus, helps in calculation of steering Error Roll Over detection Gaming Companies use MEMS Gyroscope in making Gaming Consoles Smart Phones are nowadays equipped with it, making it an input device for running of various applications Used as a Image Stabilization device for Cameras and Camcorders Detect Vibrations and Movements, thus robots can work more efficiently
- #6 Gyroscopes are based on the principle of coriolis effect. Coriolis force comes into effect whenever we observe a moving object from a rotating frame. As we can see from the figure. on the right side we see the observer is in the rotating frame and is observing the ball to follow a circular path but when we observe it from the inertial frame we see some other trajectory. The coriolis acceleration is given by following.
- #9 We could see the effect of coriolis force in the nature also. The winds travelling due to pressure differences are deflected due to rotation of the earth. Thermal Gyroscopes are based on the similar principles. Air current is generated by heating. the temperature sensors on both sides would read same values when no deflection is there i.e. when its not rotating. when rotation starts the air deflects on one side thus creating temperature difference. By plotting delta T with omega we can find the value of omega by measuring delta T.
- #12 Stream bend towards the direction of Force, illustrating the Effect of Coriolis Force
- #13 Pressure2 increases with increase in omega while Pressure1 decreases with increase in omega
- #14 COMSOL Calculated Pressure Difference for different values of Omega. Pressure v/s Omega was calculated using Matlab, and curve was fitted linearly to give equation of curve. In the actual device, this Pressure difference can be used to Calculate Omega of the device
- #15 Slope is too high and sensitivity is too low to be of Practical Importance Other devices like Pressure Sensor and pressure creator would be required driving up the cost of device