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A high-precision mechanical absolute-rotation sensor.

Krishna Venkateswara1, Charles A Hagedorn1, Matthew D Turner1

  • 1Center for Experimental and Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA.

The Review of Scientific Instruments
|February 13, 2014
PubMed
Summary
This summary is machine-generated.

We created a new mechanical sensor to precisely measure ground rotation. This device achieves high sensitivity, crucial for advanced seismic isolation experiments and rotational seismology.

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Area of Science:

  • Geophysics
  • Instrumentation
  • Seismology

Background:

  • Measuring subtle ground rotations is critical for advanced scientific experiments.
  • Existing methods may struggle with sensitivity and distinguishing true signals from noise.

Purpose of the Study:

  • To develop a mechanical absolute-rotation sensor with high sensitivity.
  • To differentiate background rotation signals from intrinsic instrument noise.

Main Methods:

  • A meter-scale beam balance with a resonance frequency of 10.8 mHz was employed.
  • Optical readout using a high-sensitivity autocollimator was utilized.
  • Co-located measurements with a tiltmeter were performed.

Main Results:

  • The sensor achieves sub-nrad/√Hz sensitivity above 30 mHz for ground rotation.
  • Excellent horizontal displacement rejection of better than 3 × 10(-5) rad/m was demonstrated.
  • Distinction between background rotation and instrument noise was achieved.

Conclusions:

  • The developed mechanical absolute-rotation sensor offers high precision for geophysical measurements.
  • This instrument is valuable for rotational seismology and enhancing seismic isolation in sensitive experiments.
  • Applications include noise rejection for seismometers in gravitational-wave observatories.