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Sensors 2017, 17(11), 2471; doi:10.3390/s17112471

A New Scale Factor Adjustment Method for Magnetic Force Feedback Accelerometer

1
MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
2
School of Physics and Astronomy, Sun Yat-sen University, Guangzhou 510275, China
3
Institute of Geophysics, Huazhong University of Science and Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Received: 26 September 2017 / Revised: 25 October 2017 / Accepted: 25 October 2017 / Published: 27 October 2017
(This article belongs to the Special Issue Inertial Sensors for Positioning and Navigation)
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Abstract

A new and simple method to adjust the scale factor of a magnetic force feedback accelerometer is presented, which could be used in developing a rotating accelerometer gravity gradient instrument (GGI). Adjusting and matching the acceleration-to-current transfer function of the four accelerometers automatically is one of the basic and necessary technologies for rejecting the common mode accelerations in the development of GGI. In order to adjust the scale factor of the magnetic force rebalance accelerometer, an external current is injected and combined with the normal feedback current; they are then applied together to the torque coil of the magnetic actuator. The injected current could be varied proportionally according to the external adjustment needs, and the change in the acceleration-to-current transfer function then realized dynamically. The new adjustment method has the advantages of no extra assembly and ease of operation. Changes in the scale factors range from 33% smaller to 100% larger are verified experimentally by adjusting the different external coefficients. The static noise of the used accelerometer is compared under conditions with and without the injecting current, and the experimental results find no change at the current noise level, which further confirms the validity of the presented method. View Full-Text
Keywords: accelerometer; adjustment of scale factor; magnetic force feedback; gravity gradient instrument accelerometer; adjustment of scale factor; magnetic force feedback; gravity gradient instrument
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Huang, X.; Deng, Z.; Xie, Y.; Li, Z.; Fan, J.; Tu, L. A New Scale Factor Adjustment Method for Magnetic Force Feedback Accelerometer. Sensors 2017, 17, 2471.

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