23-05-2012, 12:07 PM
MEMS GYROSCOPE
MEMS GYROSCOPE.pptx (Size: 915.24 KB / Downloads: 129)
What is a Gyroscope and need
Gyroscope is a device which can measure the angular velocity.
The bulky version of mechanical gyro was used in analog world, takes more space and subjected to wear and tear.
MEMS version can be used in digital world.
High sensitivity and robustness has been achieved
Mechanical Gyroscope
A spinning-wheel will resist any change
in its angular momentum vector relative
to inertial space.
Hence this system Isolates the
Spinning-wheel from outer angular movement
Ring LASER gyroscope-Type I
The inertial characteristics of light can also
be utilized, by letting two beams of
light travel in a loop in opposite directions.
If the loop rotates clockwise, the clockwise beam must travel a longer distance before finishing the loop. The opposite is true for the counter-clockwise beam. Combining the two rays in a detector, an interference pattern is formed, which will depend on the angular velocity.
Tuning Fork gyroscope
WORKING:
To a vibrating tuning fork in y-axis,
If angular velocity is given to z-axis
then because of Coriolis Force extra
vibration comes in x-axis.
This vibration is seen only when we are sitting on tuning fork(non inertial frame)
ADVANTAGE:
High resolution of 100degree/hour is achieved.
Very low drift 01 degree/hour.
Strong SNR