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Method to Measure Tone of Axial and Proximal Muscle

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Published on: December 14, 2011

A torque type full tensor gravity gradiometer based on a flexure-strip suspension.

T X Zhang¹, Y Z Bai¹, W Hong¹

¹MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.

The Review of Scientific Instruments

|July 3, 2020

Summary

This summary is machine-generated.

A new torque type gravity gradiometer overcomes limitations of accelerometer-based systems for earth resource exploration. This improved design offers high potential resolution, paving the way for next-generation gravity exploration technologies.

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Area of Science:

Geophysics
Instrumentation Science

Background:

Full tensor gravity gradiometers are crucial for earth resource exploration.
Accelerometer-based systems face limitations in dynamic range and scale factor consistency.

Purpose of the Study:

To re-consider and improve the torque type gravity gradiometer for enhanced performance.
To overcome the limitations of existing accelerometer-based gravity gradiometers.

Main Methods:

Proposed an improved torque type full tensor gravity gradiometer utilizing a flexure-strip suspension.
Analyzed key noise sources: mechanical thermal noise, position sensing noise, and readout noise.
Measured full tensor gravity gradient by observing angle variations at three azimuths.

Main Results:

A prototype gravity gradiometer achieved a resolution of 3 E/Hz^1/2 at 0.1 Hz, close to the designed 2 E/Hz^1/2.
Seismic noise was identified as the primary limiting factor for the prototype's resolution.
Demonstrated the feasibility of the flexure-strip suspension for balancing sensitivity and response time.

Conclusions:

The improved torque type gravity gradiometer shows high potential for next-generation gravity exploration.
Its independence from matching combination requirements offers significant advantages.
Further improvements are anticipated, enhancing its applicability in resource exploration.