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Sensors 2017, 17(8), 1710;

New Matching Method for Accelerometers in Gravity Gradiometer

College of Mechatronics and Automation, National University of Defense Technology, Changsha 410073, China
Author to whom correspondence should be addressed.
Received: 11 June 2017 / Revised: 15 July 2017 / Accepted: 21 July 2017 / Published: 25 July 2017
(This article belongs to the Section Physical Sensors)
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The gravity gradiometer is widely used in mineral prospecting, including in the exploration of mineral, oil and gas deposits. The mismatch of accelerometers adversely affects the measuring precision of rotating accelerometer-based gravity gradiometers. Several strategies have been investigated to address the imbalance of accelerometers in gradiometers. These strategies, however, complicate gradiometer structures because feedback loops and re-designed accelerometers are needed in these strategies. In this paper, we present a novel matching method, which is based on a new configuration of accelerometers in a gravity gradiometer. In the new configuration, an angle was introduced between the measurement direction of the accelerometer and the spin direction. With the introduced angle, accelerometers could measure the centrifugal acceleration generated by the rotating disc. Matching was realized by updating the scale factors of the accelerometers with the help of centrifugal acceleration. Further simulation computations showed that after adopting the new matching method, signal-to-noise ratio improved from −41 dB to 22 dB. Compared with other matching methods, our method is more flexible and costs less. The matching accuracy of this new method is similar to that of other methods. Our method provides a new idea for matching methods in gravity gradiometer measurement. View Full-Text
Keywords: matching method; gravity gradiometer; configuration matching method; gravity gradiometer; configuration

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Wei, H.; Wu, M.; Cao, J. New Matching Method for Accelerometers in Gravity Gradiometer. Sensors 2017, 17, 1710.

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