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Implementation of a Reference Interferometer for Nanodetection
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A low-frequency torsion pendulum with interferometric readout.

M P Ross1, K Venkateswara1, C A Hagedorn1

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

The Review of Scientific Instruments
|July 10, 2021
PubMed
Summary
This summary is machine-generated.

We developed a sensitive torsion pendulum for precise angle measurements. This instrument achieves low noise levels, enabling applications in seismology, gravitational wave detection, and fundamental physics tests.

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Area of Science:

  • Experimental Physics
  • Geophysics
  • Astrophysics

Background:

  • Precise measurement of small angles is crucial for various scientific disciplines.
  • Existing instruments face limitations in sensitivity and frequency range for certain applications.

Purpose of the Study:

  • To develop and characterize a novel torsion pendulum system with high sensitivity.
  • To explore its potential applications in seismology, gravity studies, and gravitational wave detection.

Main Methods:

  • Construction of a torsion pendulum with a large mass-quadrupole moment.
  • Utilized a Michelson interferometer for high-precision angle measurement.
  • Characterized the system's noise performance across a wide frequency range.

Main Results:

  • Achieved noise levels of approximately 200 prad/√Hz between 0.2 and 30 Hz.
  • Demonstrated noise levels of approximately 10 prad/√Hz above 100 Hz.
  • The system operates with a resonant frequency of 2.8 mHz.

Conclusions:

  • The developed torsion pendulum offers unprecedented sensitivity for angular measurements.
  • Potential applications include studying rotational seismic motion, elastogravity signals, and gravitational waves.
  • The system is a valuable tool for fundamental tests of gravity.