Author Topic: Lower cost digital 3-axis gyro  (Read 117 times)

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Offline raptor1956

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Lower cost digital 3-axis gyro
« on: July 11, 2019, 07:41:52 pm »
I'm looking into picking up a digital gyro with sufficient resolution to detect rotation down to 15 arcsec/sec and perhaps a bit better.  Alternatively, increasing the sampling interval to 10 seconds or so might permit a bit less resolution.  Ultimately, I want to be able to measure the rotation of the Earth which is just a bit over 15 degrees per hour or 15 arcsec/sec.  There are LOTS of units in the $20-$80 range with many including 3-axis accelerometers as well as magnetometers and baro sensors and I'd be happy getting a more capable sensor so long as the price is right.  I understand that MEMS is capable of detecting Earths rotation but just which model is hard to discern. 

Of course, when attempting to measure Earth's rotation it's a good idea to mount the sensor with a polar alignment and if the unit is sensitive enough the angular velocities should help with roughing the polar alignment.  Such a sensor might speed telescope alignment, though to get down to sub arcmin accuracy I don't see anything but the highest performance laser gyros being able to do that.  But, if getting a rough alignment is quicker then tweaking that by sighting on Polaris and other stars is still necessary.


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