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A high precision, compact electromechanical ground rotation sensor.

V Dergachev1, R DeSalvo1, M Asadoor2

  • 1LIGO Laboratory, California Institute of Technology, MS 100-36, Pasadena, California 91125, USA.

The Review of Scientific Instruments
|June 2, 2014
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Summary
This summary is machine-generated.

We developed a low-noise mechanical rotation sensor using a tungsten carbide knife edge. This innovation is crucial for seismic isolation systems and rotational seismology, enabling more sensitive measurements.

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Area of Science:

  • Seismology
  • Gravitational Wave Detection
  • Mechanical Engineering

Background:

  • Precision seismic isolation systems are vital for gravitational wave interferometers and rotational seismology.
  • Existing sensors face limitations in sensitivity and noise performance.

Purpose of the Study:

  • To develop and characterize a novel mechanical rotation sensor.
  • To achieve low-noise operation for enhanced seismic and rotational measurements.

Main Methods:

  • Constructed a mechanical rotation sensor utilizing a tungsten carbide knife edge pivot.
  • Employed an air-core linear variable differential transformer for position sensing.
  • Evaluated sensor performance and noise floor.

Main Results:

  • Demonstrated a low noise floor for the rotation sensor.
  • Achieved an upper bound noise floor of 5.7 × 10⁻⁹ rad/√Hz at 10 mHz and 6.4 × 10⁻¹⁰ rad/√Hz at 0.1 Hz.
  • Knife edge hinge performance is free from dislocation self-organized criticality noise.

Conclusions:

  • The developed mechanical rotation sensor offers high sensitivity and low noise.
  • This sensor is suitable for advanced seismic isolation systems and rotational seismology.
  • The design minimizes noise sources, paving the way for more precise measurements.