A high-precision mechanical absolute-rotation sensor.

@article{Venkateswara2014AHM,
  title={A high-precision mechanical absolute-rotation sensor.},
  author={Krishna Venkateswara and Charles A. Hagedorn and Matthew D Turner and Trevor B. Arp and Jens H Gundlach},
  journal={The Review of scientific instruments},
  year={2014},
  volume={85 1},
  pages={
          015005
        }
}
We have developed a mechanical absolute-rotation sensor capable of resolving ground rotation angle of less than 1 nrad/√Hz above 30 mHz and 0.2 nrad/√Hz above 100 mHz about a single horizontal axis. The device consists of a meter-scale beam balance, suspended by a pair of flexures, with a resonance frequency of 10.8 mHz. The center of mass is located 3 μm above the pivot, giving an excellent horizontal displacement rejection of better than 3 × 10(-5) rad/m. The angle of the beam is read out… 
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