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Gyro behavior on startup, while rotating

Posted by Jonathan Brandmeyer on April 25, 2010 at 8:39am
What happens to a MEMS gyro's null point if it starts up while actively rotating? Does the internal hardware make any assumption about the initial motion of the sensor when it starts up?

Say the gyro is sitting on a 50 deg/s spinning turntable when it is initially energized. Does the gyro stabilize to 50 deg/s +/- the normal initial null instability, or does it report an initial rate of ~zero even though it is actually spinning?

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  • David Gitz April 26, 2010 at 1:44pm
    It might, but I would have to consult the datasheet for the specific device you have. I believe (I'm not referencing anything here, just going off my memory) that there are 2 ways to make a MEMS gyro, the first implements a very small beam with sensors on both sides that measures the deflection of the beam due to rotation, and the other kind heats up very small bubbles of fluid and when they are rotated their temperature changes, something to that effect. I'm pretty sure that both kinds deal with some very small physical object that applies force to a transducer, so I would think that powering the device with a force already applied would calibrate it to that accordingly. Someone correct me.
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