Effects and Prospects of the Vibration Isolation Methods for an Atomic Interference Gravimeter

Gong, Wenbin; Liu, An; Huang, Chi‐Chou; Che, Hao; Feng, Chengxu; Qin, Fangjun

doi:10.3390/s22020583

Cited by 13 publications

(9 citation statements)

References 95 publications

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“…The initial isolation frequency of a linear isolator is √ 2 times its natural frequency [15,16]. In other words, a lower natural frequency is required to achieve low-frequency isolation using a linear isolator.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Zero Stiffness Isolator Suitable for Low-Frequency Vibration

et al. 2023

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This paper proposes a quasi-zero stiffness (QZS) isolator based on an inclined trapezoidal beam to explore its advantages in low-frequency passive vibration isolation. The nonlinear stiffness of the inclined trapezoidal beam due to the buckling effect is investigated through finite element simulation, and a linear positive stiffness spring is connected in parallel to form a QZS isolator with high-static and low-dynamic stiffness performance. The natural frequency of the isolator in the QZS region is simulated and analyzed, and the dynamic response of the QZS isolator under different damping ratios, excitation and load conditions is explored. The prototype of the QZS isolator was manufactured, and a static compression experiment was conducted to obtain its nonlinear stiffness. The dynamic experiment results verify the correctness of the simulation conclusions. The simulation and experimental data demonstrate that the QZS isolator has the characteristics of lower initial isolation frequency compared with the equivalent linear isolator. The proposed QZS isolator has an initial isolation frequency of 2.91 Hz and achieves a 90% isolation efficiency at 7.02 Hz. The proposed QZS isolator has great application prospects and can provide a reference for optimizing low-frequency or ultra-low-frequency isolators.

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Section: Introductionmentioning

confidence: 99%

Quasi-Zero Stiffness Isolator Suitable for Low-Frequency Vibration

et al. 2023

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“…Figure 1.1 shows one of the possible optical setups for interferometry measurement of the LCoS wavefront, proposed by [4]. However, due to the nature of interferometry, these methods usually require a highly stable environment with minimal vibration and ambient light [6], which is not always available in every circumstance. In this paper, we intend to evaluate the classical polarimetric method [7,8,9], validating its application in the measurement of non-uniform phase response of LCoS-SLMs.…”

Section: Introductionmentioning

confidence: 99%

57.2: Error Analysis in LCoS Phase Uniformity Measurement with Classical Polarimetric Method for Holographic Display Applications

Zhang,

2023

Symp Digest of Tech Papers

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The classical polarimetric method has been widely used in Liquid Crystal on Silicon (LCoS) phase depth measurement with a simple optical setup. However, the current method does not provide sufficient accuracy to measure the phase uniformity due to interference caused by LCoS cover glass reflections. This paper is aimed at mathematically analyzing the errors caused by non‐ideal glass reflections, and proposing procedures to reduce or eliminate such errors. The measurement is discussed in three conditions, including an ideal condition with no reflections off the LCoS cover glass, a second condition with only forward reflection off the cover glass and a third condition with only backward reflection off the cover glass. It is discovered that the backward reflection has the largest contribution to the overall measurement error, and is the main obstacle to high‐quality measurements. Several procedures including optical alignment, gap thickness measurement and phase estimation based on gap thickness are proposed, making the uniformity measurement more qualitative and consistent.

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“…Presently, vibration noise is commonly inhibited by vibration isolation or compensation [8][9][10][11]. A vibration isolation platform is effective in easing the interference caused by vibration on gravity measurement, and helps to achieve good accuracy measurement [12].…”

Section: Introductionmentioning

confidence: 99%

A vibration compensation optimization method for a mobile atomic gravimeter

Gong

Liu

et al. 2023

Meas. Sci. Technol.

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The information on the earth’s gravity provides significant strategic support for the national economy, defense, and security. Atomic gravimeter (AG) realizes highly precise measurements of gravitational acceleration by virtue of atomic interference. Vibration noise is a strong contributor to the limitation on the measurement sensitivity and accuracy of an AG. Vibration compensation enhances the environmental adaptability of an AG since it can facilitate the measurement of gravity when an isolation platform is unavailable. A dynamic compensation filter was devised for the correction of the data output from a seismometer, which expanded the bandwidth of the seismometer and lowered the distortion of vibration signals. Additionally, transfer function estimation was introduced to better reflect the actual vibration of the Raman mirror. Based on the simplified transfer function model, this method can modify the interference fringes of the AG in real-time. The experimental results exposed that the proposed optimization method could make the cosine fitting phase uncertainty of interference fringes attenuate by up to 85.91%, and reach the uncertainty of about 76.37 μGal in a complicated vibration environment. The measurement accuracy was effectively improved by the proposed method. After all, it was verified that the proposed method was effective and adaptable in a complicated environment.

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Effects and Prospects of the Vibration Isolation Methods for an Atomic Interference Gravimeter

Cited by 13 publications

References 95 publications

Quasi-Zero Stiffness Isolator Suitable for Low-Frequency Vibration

Quasi-Zero Stiffness Isolator Suitable for Low-Frequency Vibration

57.2: Error Analysis in LCoS Phase Uniformity Measurement with Classical Polarimetric Method for Holographic Display Applications

A vibration compensation optimization method for a mobile atomic gravimeter

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