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Method to Measure Tone of Axial and Proximal Muscle
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A multi-orientation low-frequency rotational accelerometer.

J J McCann1, J Winterflood1, L Ju1

  • 1ARC Centre of Excellence OzGrav, UWA Node, The University of Western Australia, Perth, WA 6009, Australia.

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

We developed ALFRA, a compact rotational accelerometer, achieving high sensitivity for low-frequency measurements. This advanced sensor offers precise detection of rotational motion for various scientific applications.

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Area of Science:

  • Geophysics
  • Seismology
  • Instrumentation

Background:

  • Accurate measurement of low-frequency rotation is crucial for geophysical studies.
  • Existing rotational sensors often face limitations in sensitivity or size.

Purpose of the Study:

  • To introduce ALFRA, a novel low-frequency rotational accelerometer.
  • To demonstrate its high sensitivity and compact design for ground rotation sensing.

Main Methods:

  • Utilizing a beam-balance style rotation sensor with a cross flexure mount for versatile orientation.
  • Employing a walk-off sensor readout in a feedback loop with an electromagnetic coil for dynamic beam locking.

Main Results:

  • Achieved a readout sensitivity of a few nrad/Hz above 20 mHz.
  • Demonstrated a sensitivity of 0.1 nrad/Hz above 50 mHz.
  • The sensor measures 780 × 240 × 55 mm³, making it compact for ground applications.

Conclusions:

  • ALFRA offers high sensitivity and a compact form factor for low-frequency rotation sensing.
  • Its versatile mounting allows for measurement of various rotational components.
  • The developed sensor advances capabilities in geophysical and seismological instrumentation.