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Method of phase extraction between coupled atom interferometers using ellipse-specific fitting.

G T Foster, J B Fixler, J M McGuirk

|November 21, 2007

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We developed a new analysis method for gravity gradient measurements. This technique accurately extracts phase shifts from noisy data, enabling precise gravity measurements even with significant vibrations.

Area of Science:

Geophysics
Instrumentation
Signal Processing

Background:

Gravity gradiometers are sensitive instruments for geophysical surveys.
Vibrational noise is a significant challenge in obtaining accurate gravity gradient data.
Existing methods struggle to isolate true signals from common-mode noise.

Purpose of the Study:

To present a novel ellipse-specific fitting analysis method.
To enable rapid extraction of induced gradient phase shifts.
To improve the accuracy of gravity gradient measurements in noisy environments.

Main Methods:

Utilizing sinusoidally coupled data from two gravimeters in a gradiometer setup.
Applying ellipse-specific fitting to analyze the data.
Developing a method to mitigate common-mode vibrational phase noise.

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Main Results:

Successful rapid extraction of induced gradient phase shifts was achieved.
Accurate measurement of gravity gradients was demonstrated.
The method proved effective even in the presence of large vibrational accelerations.

Conclusions:

The presented analysis method offers a robust solution for gravity gradient measurements.
This technique enhances the reliability of geophysical data acquisition.
It paves the way for more precise subsurface exploration using gravity gradiometry.