Tuning the Stiffness Balance Using Characteristic Frequencies as a Criterion for a Superconducting Gravity Gradiometer

Liu, Xikai; Ma, Dong; Chen, Liang

doi:10.3390/s18020517

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…Shown in Figure 1 is the layout of a home-made vertical vibrator. It is being developed to provide a clean vertical vibration for measuring the common-mode rejection ratio of gravity gradiometers [16].…”

Section: Practical Applicationmentioning

confidence: 99%

Reduce the Waveform Distortion Using High-Order Harmonical Driving Current for a Vibrator

et al. 2021

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A method to reduce waveform distortion is proposed and experimentally verified for vibrators driven by voice coil motors. In this method, a current including high-order harmonics is synthesized to drive the vibrator. The amplitudes and phases of the high-order harmonics are calculated based on the measured parameters which are correlated with the distortion. These parameters include the displacement dependence of the vibrator stiffness and that of the magnetic force per unit current. The calculation model is built on the nonlinear vibrator dynamic equation. By minimizing the lower order harmonics of the output acceleration, a series solution is obtained to synthesize the driving current. The feasibility has been demonstrated by Simulink simulation. Applying this strategy to a home-made vibrator, the waveform distortion of vibration acceleration has been reduced from 9.60% to 1.22%. The proposed method provides an alternative technology to reduce the distortion. This technology is especially useful in case that it is difficult to reduce the nonlinearity of the vibrator.

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Section: Practical Applicationmentioning

confidence: 99%

Reduce the Waveform Distortion Using High-Order Harmonical Driving Current for a Vibrator

et al. 2021

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“…The actuating method was described in Ref. [ 21 ], a brief calculation of the circuit is provided here. When a sinusoidal current is coupled into the superconducting loops through the adjustable gain amplifiers and the transformers, the total currents I 1 and I 2 can be calculated from the flux conservation of the two loops.…”

Section: Theoretical Analysismentioning

confidence: 99%

Method for Translation and Rotation Decoupling of Test Mass in Full-Maglev Vertical Superconducting Gravity Instruments

Wang

Chen

Liu

et al. 2020

Sensors

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For full-maglev vertical superconducting gravity instruments, displacement control in the non-sensitive axis is a key technique to suppress cross-coupling noise in a dynamic environment. Motion decoupling of the test mass is crucial for the control design. In practice, when levitated, the test mass is always in tilt, and unknown parameters will be introduced to the scale factors of displacement detection, which makes motion decoupling work extremely difficult. This paper proposes a method for decoupling the translation and rotation of the test mass in the non-sensitive axis for full-maglev vertical superconducting gravity instruments. In the method, superconducting circuits at low temperature and adjustable gain amplifiers at room temperature are combined to measure the difference between the scale factors caused by the tilt of the test mass. With the measured difference of the scale factors, the translation and rotation are decoupled according to the theoretical model. This method was verified with a test of a home-made full-maglev vertical superconducting accelerometer in which the translation and rotation were decoupled.

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A horizontal linear vibrator for measuring the cross-coupling coefficient of superconducting gravity gradiometers

et al. 2021

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Tuning the Stiffness Balance Using Characteristic Frequencies as a Criterion for a Superconducting Gravity Gradiometer

Cited by 7 publications

References 17 publications

Reduce the Waveform Distortion Using High-Order Harmonical Driving Current for a Vibrator

Reduce the Waveform Distortion Using High-Order Harmonical Driving Current for a Vibrator

Method for Translation and Rotation Decoupling of Test Mass in Full-Maglev Vertical Superconducting Gravity Instruments

A horizontal linear vibrator for measuring the cross-coupling coefficient of superconducting gravity gradiometers

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