Measurements of temporal and spatial variation of surface potential using a torsion pendulum and a scanning conducting probe

Yin, Hong; Bai, Yanzheng; Hu, Ming; Liu, Li; Luo, Jun; Tan, Ding-Yin; Yeh, Hsien-Chi; Zhou, Zebing

doi:10.1103/physrevd.90.122001

Cited by 24 publications

(14 citation statements)

References 21 publications

(26 reference statements)

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“…Forces acting on the TM surface include other spontaneous outgassing and/or virtual leak pressure effects, from the many cables and other surfaces inside the GRS, as well as electrostatic noise from fluctuating small-scale surface patch potentials interacting with their own steady field values. Regarding the electrostatic noise, while the interaction of the spatially averaged stray fields and the TM charge is well measured in flight [15], random field fluctuations on smaller scales cannot be excluded, at the levels of the remaining noise, from either flight measurements or ground studies [16][17][18]. Pressure-related effects can be addressed by direct pressure measurements in representative GRS hardware, while electrostatic force noise and other short range forces can be studied on the ground in torsion pendulum tests with much smaller gaps between the TM and surrounding conducting surfaces.…”

mentioning

confidence: 99%

Beyond the Required LISA Free-Fall Performance: New LISA Pathfinder Results down to 20 μHz

Armano¹,

Audley²,

Baird³

et al. 2018

Phys. Rev. Lett.

281

207

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In the months since the publication of the first results, the noise performance of LISA Pathfinder has improved because of reduced Brownian noise due to the continued decrease in pressure around the test masses, from a better correction of noninertial effects, and from a better calibration of the electrostatic force actuation. In addition, the availability of numerous long noise measurement runs, during which no perturbation is purposely applied to the test masses, has allowed the measurement of noise with good statistics down to 20 μHz. The Letter presents the measured differential acceleration noise figure, which is at (1.74±0.05) fm s^{-2}/sqrt[Hz] above 2 mHz and (6±1)×10 fm s^{-2}/sqrt[Hz] at 20 μHz, and discusses the physical sources for the measured noise. This performance provides an experimental benchmark demonstrating the ability to realize the low-frequency science potential of the LISA mission, recently selected by the European Space Agency.

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mentioning

confidence: 99%

Beyond the Required LISA Free-Fall Performance: New LISA Pathfinder Results down to 20 μHz

Armano¹,

Audley²,

Baird³

et al. 2018

Phys. Rev. Lett.

281

207

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“…The schematic of this novel scheme is shown in Figure 13 a; this scheme combines the scanning capability of the Kelvin probe and the high precision of the torsion pendulum. Temporal variation of the surface potential can be measured at a level of 15 μV/Hz 1/2 at 0.03 Hz, and the surface-potential distribution can be obtained at a level of 330 μV at a 0.125-mm spatial resolution, as shown in Figure 13 b [ 57 ].…”

Section: Progress Of Electrostatic Accelerometer Development At Humentioning

confidence: 99%

Research and Development of Electrostatic Accelerometers for Space Science Missions at HUST

Bai

et al. 2017

Sensors

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High-precision electrostatic accelerometers have achieved remarkable success in satellite Earth gravity field recovery missions. Ultralow-noise inertial sensors play important roles in space gravitational wave detection missions such as the Laser Interferometer Space Antenna (LISA) mission, and key technologies have been verified in the LISA Pathfinder mission. Meanwhile, at Huazhong University of Science and Technology (HUST, China), a space accelerometer and inertial sensor based on capacitive sensors and the electrostatic control technique have also been studied and developed independently for more than 16 years. In this paper, we review the operational principle, application, and requirements of the electrostatic accelerometer and inertial sensor in different space missions. The development and progress of a space electrostatic accelerometer at HUST, including ground investigation and space verification are presented.

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“…The surface of an ideal metallic conductor is often assumed to be an equipotential. However, it would not be true for real metallic surface according to the measurements of surface potential [1][2][3][4][5][6][7][8][9][10], for example, Camp et al measured surface potential variations of 70 mV over scales of 10 mm in a mental sample [2]. Furthermore, fluctuations in the electric potential are also be observed by different experiments [4,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the methods to study the origin and influence of patch potential includes the experimental measurement and the theoretical modeling. For the experimental measurement of the patch effect, the Kelvin probe and the torsion pendulum methods are often used [4][5][6][7][8][9]32]. The Kelvin probe force microscopy (KPFM) can measure the potentials over the testing region with an extremely high spatial resolution of about several nanometers.…”

Section: Introductionmentioning

confidence: 99%

“…The torsion pendulum can measure the temporal fluctuations of surface potentials with a resolution of 30 µV/Hz 1/2 , but it can not obtain the information about the spatial potential distribution [9]. Therefore, Huazhong University of Science and Technology (HUST) research group developed a torsion pendulum with a scanning probe to measure the surface potential [6,7]. Their results show that the voltage resolution can reach a level of 4 µV/Hz 1/2 for a millimetre area and the spatial distribution is about 330 µV at 0.125 mm spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

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Electrostatic effect due to patch potentials between closely spaced surfaces

Ke¹,

Dong²,

Huang³

et al. 2023

Preprint

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The spatial variation and temporal variation in surface potential are important error sources in various precision experiments and deserved to be considered carefully. In the former case, the theoretical analysis shows that this effect depends on the surface potentials through their spatial autocorrelation functions. By making some modification to the quasi-local correlation model, we obtain a rigorous formula for the patch force, where the magnitude is proportional to 1 a 2 ( a w ) β(a/w)+2 with a the distance between two parallel plates, w the mean patch size, and β the scaling coefficient from −2 to −4. A torsion balance experiment is then conducted, and obtain a 0.4 mm effective patch size and 20 mV potential variance. In the latter case, we apply an adatom diffusion model to describe this mechanism and predicts a f −3/4 frequency dependence above 0.01 mHz. This prediction meets well with a typical experimental results. Finally, we apply these models to analyze the patch effect for two typical experiments. Our analysis will help to investigate the properties of surface potentials.

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Measurements of temporal and spatial variation of surface potential using a torsion pendulum and a scanning conducting probe

Cited by 24 publications

References 21 publications

Beyond the Required LISA Free-Fall Performance: New LISA Pathfinder Results down to 20 μHz

Beyond the Required LISA Free-Fall Performance: New LISA Pathfinder Results down to 20 μHz

Research and Development of Electrostatic Accelerometers for Space Science Missions at HUST

Electrostatic effect due to patch potentials between closely spaced surfaces

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