A note on constructing the gravity potential meter by using atomic clocks

2011 ◽  
Author(s):  
Kyozo Nozaki ◽  
Akito Araya
Keyword(s):  
Gravity Potential ◽  
Atomic Clocks

Determining gravity potential difference via VLBI time comparisons

2021 ◽  
Author(s):  
Yifan Wu ◽  
Wen-Bin Shen
Keyword(s):  
High Reliability ◽  
Space Station ◽  
Potential Difference ◽  
Gravity Potential ◽  
Atomic Clocks ◽  
Height System ◽  
Celestial Bodies ◽  
Excellent Work ◽  
Present Simulation ◽  
Comparison Technique

<p>VLBI technique plays important role in both astronomy and geodesy due its fantastic ability to determine the position of celestial bodies and the length of baseline on Earth. Moreover it also presents excellent work on time comparisons between atomic clocks located in remote positions where optical fiber links are not accessible. Due to its high reliability and stability, the information of Earth’s gravity field can be extracted from VLBI time comparisons in the framework of general relativity. In this study, we provide a formulation to determine the gravity potential difference by VLBI time comparisons. In fact the precision of the estimated gravity potential depends on the performance of participated clocks and the accuracy of time comparison technique. Thus we present simulation experiments using clocks with 10<sup>-16</sup>@1d stability and broadband VLBI observation and determine gravity potential difference within a VLBI network around world with 10 m<sup>2</sup>/s<sup>2 </sup>precision which is equivalent to 1 m in height. The results could be greatly improved using optical atomic clocks with much higher stabilities. Furthermore it can be applied to height transfer across oceans and unifying the height system. This study is supported by the National Natural Science Foundations of China (NSFC) under Grants 42030105, 41721003, 41804012, 41631072, 41874023, and Space Station Project (2020)228.</p>

Optical Atomic Clocks: From International Timekeeping to Gravity Potential Measurement

2019 ◽  
Author(s):  
Helen S. Margolis ◽  
Heiner Denker ◽  
Christian Voigt ◽  
Ludger Timmen ◽  
Jacopo Grotti ◽  
...  
Keyword(s):  
Gravity Potential ◽  
Atomic Clocks ◽  
Potential Measurement

Mass spectrometry for future atomic clocks

Nature ◽  
2020 ◽  
Vol 581 (7806) ◽  
pp. 35-36
Author(s):  
Marianna S. Safronova
Keyword(s):  
Mass Spectrometry ◽  
Atomic Clocks

Atomic clocks

1958 ◽  
Vol 4 (48) ◽  
pp. 647-653
Author(s):  
L. Essen
Keyword(s):  
Atomic Clocks

scholarly journals The surface layer integral method for the modelling of the radial gravity gradient component over sea surface

2019 ◽  
Vol 9 (1) ◽  
pp. 127-132
Author(s):  
D. Zhao ◽  
Z. Gong ◽  
J. Feng
Keyword(s):  
Surface Layer ◽  
Integral Method ◽  
Integral Formula ◽  
Radial Component ◽  
Second Order ◽  
Sea Surface ◽  
Gravity Potential ◽  
Gravity Gradient ◽  
Disturbing Potential ◽  
Gradient Component

Abstract For the modelling and determination of the Earth’s external gravity potential as well as its second-order radial derivatives in the space near sea surface, the surface layer integral method was discussed in the paper. The reasons for the applicability of the method over sea surface were discussed. From the original integral formula of disturbing potential based on the surface layer method, the expression of the radial component of the gravity gradient tensor was derived. Furthermore, an identity relation was introduced to modify the formula in order to reduce the singularity problem. Numerical experiments carried out over the marine area of China show that, the modi-fied surface layer integral method effectively improves the accuracy and reliability of the calculation of the second-order radial gradient component of the disturbing potential near sea surface.

scholarly journals Efforts towards a low-temperature-sensitive physics package for vapor cell atomic clocks

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Qiang Hao ◽  
Wenxiang Xue ◽  
Feng Xu ◽  
Kemu Wang ◽  
Peter Yun ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Sensitive ◽  
Atomic Clocks ◽  
Vapor Cell

scholarly journals Review of Environmental and Geological Microgravity Applications and Feasibility of Its Employment at Archaeological Sites in Israel

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Lev V. Eppelbaum
Keyword(s):  
Gravity Anomalies ◽  
Gravity Potential ◽  
Archaeological Sites ◽  
Useful Signal ◽  
Geometric Size ◽  
Archaeological Models ◽  
Vertical Gravity ◽  
Transformation Methods ◽  
Derivatives Of ◽  
Archaeological Objects

Microgravity investigations are widely applied at present for solving various environmental and geological problems. Unfortunately, microgravity survey is comparatively rarely used for searching for hidden ancient targets. It is caused mainly by small geometric size of the desired archaeological objects and various types of noise complicating the observed useful signal. At the same time, development of modern generation of field gravimetric equipment allows to register promptly and digitally microGal (10-8 m/s2) anomalies that offer a new challenge in this direction. An advanced methodology of gravity anomalies analysis and modern 3D modeling, intended for ancient targets delineation, is briefly presented. It is supposed to apply in archaeological microgravity the developed original methods for the surrounding terrain relief computing. Calculating second and third derivatives of gravity potential are useful for revealing some closed peculiarities of the different Physical-Archaeological Models (PAMs). It is underlined that physical measurement of vertical gravity derivatives in archaeological studying has a significant importance and cannot be replaced by any transformation methods. Archaeological targets in Israel have been ranged by their density/geometrical characteristics in several groups. The performed model computations indicate that microgravity investigations might be successfully applied at least in 20–25% of archaeological sites in Israel.

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