Vibration compensation of an atom gravimeter

Xu, Aopeng; Kong, Delong; Fu, Zhijie; Wang, Zhaoying; Lin, Qiang

doi:10.3788/col201917.070201

Cited by 14 publications

(7 citation statements)

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“…By modulating the frequency difference of the Raman lasers, the atoms only interact with one pair of counterpropagation Raman lasers, and achieve a momentum variation of 𝑘 eff = (𝑘 1 − 𝑘 2 ) ≈ 2 𝑘 1 . When neglecting the gravity gradient and noise, the phase difference Φ of the two MZ interferometer arms is expressed as [16] Φ…”

Section: Vibration Noise In the Atomic Gravimetermentioning

confidence: 99%

“…These vibration noise suppression techniques can be classified into two kinds: the first kind is reducing the absolute vibration of the mirror by putting it on a passive or active vibration isolation platform, in this way the vibration noise below 10 Hz could be reduced to a level of 10 −8 g/Hz 1/2 , [13,15] the second kind is monitoring the vibration of the mirror with high sensitive seismometer or accelerometer, and then correcting the vibration phase with real-time compensation or post-correction techniques. [16,17] The real-time compensation technique feedbacks the monitored vibration noise power spectral densities to the Raman laser phase-locked device to compensate vibration noise while the post-correction technique compensates the vibration noise induced phase fluctuations in the final atomic interference phase. However, from the perspective of implemental technology, these methods either need to add a cumbersome vibration isolation platform or an expensive seismometer to the atomic gravimeter.…”

Section: Introductionmentioning

confidence: 99%

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Michelson laser interferometer-based vibration noise contribution measurement method for cold atom interferometry gravimeter*

Zhang¹,

Hu²,

Wang³

et al. 2020

Chinese Phys. B

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The measurement performance of the atom interferometry absolute gravimeter is strongly affected by the ground vibration noise. We propose a vibration noise evaluation scheme using a Michelson laser interferometer constructed by the intrinsic Raman laser of the atomic gravimeter. Theoretical analysis shows that the vibration phase measurement accuracy is better than 4 mrad, which corresponds to about 10−10 g accuracy for a single shot gravity measurement. Compared with the commercial seismometer or accelerometer, this method is a simple, low cost, direct, and fully synchronized measurement of the vibration phase which should benefit the development of the atomic gravimeter. On the other side, limited by equivalence principle, the result of the laser interferometer is not absolute but relative vibration measurement. Triangular cap method could be used to evaluation the noise contribution of vibration, which is a different method from others and should benefit the development of the atomic gravimeter.

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Section: Vibration Noise In the Atomic Gravimetermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Michelson laser interferometer-based vibration noise contribution measurement method for cold atom interferometry gravimeter*

Zhang¹,

Hu²,

Wang³

et al. 2020

Chinese Phys. B

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“…The vibration-induced noise will inevitably exert an effect on the measurement, leading to the measurement error of the gravimeter. As revealed in some test results, an accurate gravity measurement is not easily implemented if the vibration-induced noise is not inhibited [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…At the end of the 20th century, vibration compensation was put forth to detect the vibration-induced noise of a reference mirror inside a gravimeter using a sensor, such as a seismometer or an accelerometer, and then correct the measured gravity accordingly. The vibration compensation with a seismometer in a laboratory had been achieved by some research teams from the Observatoire de Paris [ 16 ], the Universität Hannover [ 17 ], the National Institute of Metrology, China [ 18 ], the Tsinghua University [ 19 ], and the Zhejiang University [ 9 ]. After vibration compensation, the standard deviation of each measurement reached dozens or hundreds of µGal.…”

Section: Introductionmentioning

confidence: 99%

An Approach of Vibration Compensation for Atomic Gravimeter under Complex Vibration Environment

Che

Zhu

et al. 2023

Sensors

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Atomic gravimeter has been more frequently applied under complex and dynamic environments, but its measurement accuracy is seriously hampered by vibration-induced noise. In this case, vibration compensation provides a way to enhance the accuracy of gravity measurements by correcting the phase noise that resulted from the vibration of a Raman reflector, and improving the fitting of an interference fringe. An accurate estimation of the transfer function of vibration between the Raman reflector and the sensor plays a significant role in optimizing the effect of vibration compensation. For this reason, a vibration compensation approach was explored based on EO (equilibrium optimizer) for estimating the transfer function simplified model of a Raman reflector, and it was used to correct the interference fringe of an atomic gravimeter. The test results revealed that this approach greatly restored the actual vibration of the Raman reflector in a complex vibration environment. With a vibration compensation algorithm, it achieved the correction and fitting of the original interference fringe. In general, it dramatically reduced the RMSE (root mean square error) at the time of fitting and significantly improved the residual error in the gravity measurement. Compared with other conventional algorithms, such as GA (genetic algorithm) and PSO (particle swarm optimization), this approach realized a faster convergence and better optimization, so as to ensure more accurate gravity measurements. The study of this vibration compensation approach could provide a reference for the application of an atomic gravimeter in a wider and more complex environment.

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“…For this reason, vibration noise isolation and attenuation are crucial to obtaining accurate atomic interference phase and realizing accurate gravity field information detection. In order to guarantee the measurement precision of an atomic gravity, vibration isolation techniques [5,6] and vibration compensation methods [7][8][9] are often employed for vibration noise suppression. The noise in the marine environment is very complex and vulnerable to impulse noise, so it is difficult to process the signal [10].…”

Section: Introductionmentioning

confidence: 99%

A Vibration Signal Denoising Method of Marine Atomic Gravimeter Based on Improved Variational Mode Decomposition

Gong

Liao

et al. 2022

Wireless Communications and Mobile Computing

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As a high-precision gravity measuring device, a marine atomic gravimeter is highly sensitive to vibration signals. Accurate measurement and analysis of vibration signal is the primary condition to realize vibration compensation and vibration suppression. Denoising plays a crucial role in the processing of these vibration signals. The vibration signals of a marine gravimeter contain numerous nonlinear and nonstationary components. In this paper, a vibration signal denoising method of marine atomic gravimeter based on improved variational mode decomposition (VMD) was put forward to effectively suppress the noise. An improved genetic particle swarm optimization (GPSO) was first adopted for the parametric optimization of VMD by taking minimum permutation entropy (PE) as fitness function and adaptively determining the optimal parameters of VMD. PE was then utilized to calculate the proportion of noise-containing components in the intrinsic mode function (IMF) components obtained by VMD. The components were classified into noise and signal components by searching for the mutation points of two adjacent IMF permutation entropies. On this basis, noise components were denoised by Savitzky-Golay (SG) filter. In the end, the denoised components were reconstructed with the signal components to generate denoised vibration signals. To verify the effectiveness, the proposed method was applied in denoising, simulated and measured vibration signals of a marine atomic gravimeter, and compared with Daubechies (db) wavelet, Symlets (sym) wavelet, and empirical mode decomposition (EMD). The results showed that the proposed method could effectively remove the noise from nonlinear vibration signals and retain the authentic and useful information, so that it was able to provide the supporting data for gravity compensation of marine atomic gravimeter.

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Vibration compensation of an atom gravimeter

Cited by 14 publications

References 0 publications

Michelson laser interferometer-based vibration noise contribution measurement method for cold atom interferometry gravimeter*

Michelson laser interferometer-based vibration noise contribution measurement method for cold atom interferometry gravimeter*

An Approach of Vibration Compensation for Atomic Gravimeter under Complex Vibration Environment

A Vibration Signal Denoising Method of Marine Atomic Gravimeter Based on Improved Variational Mode Decomposition

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