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A new ellipse fitting method of the minimum differential-mode noise in the atom interference gravimeter

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Chinese Physics B 2018年第7期27卷 190-195页

作者： Aopeng Xu Zhaoying Wang Delong Kong Zhijie Fu Qiang Lin Institute of Optics Department of PhysicsZhejiang UniversityHangzhou 310027China Center for Optics and Optoelectronics Research College of ScienceZhejiang University of TechnologyHangzhou 310023China

Ellipse fitting is a useful tool to obtain the differential signal of two atom interference gravimeters. The quality standard of ellipse fitting should be the deviation between the true phase and the fitting phase of the interference fringe. In this paper, we present a new algorithm to fit the ellipse. The algorithm is to minimize the differential noise of two interference gravimeters and obtain a more accurate value of the gravity gradient. We have theoretically derived the expression of the differential-mode noise and implemented the ellipse fitting in the program. This new algorithm is also compared with the classical methods.

关键词： ellipse fitting atom interference gravity measurement

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measurement and Analysis of Vibration Effect of Free-falling Corner Cube Driving Mechanism in Free Fall Absolute Gravimeter

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Acta Geologica Sinica(English Edition) 2024年第S1期98卷 84-86页

作者： ZHANG Bing ZHU Xiaoyi WU Qiong XUE Bing XING Lili WU Yanxiong SU Peng WANG Xiaolei WANG Yuru WANG Chuhan Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Institute of Geophysics China Earthquake AdministrationBeijing 100081China Institute of Disaster Prevention SanheHebei 065201China

The vibration interference of the reference corner cube runs through the free flight process of the free-falling corner cube,which is superimposed on the whole laser interference ***,it is necessary to solve the inter... 详细信息

关键词： laser interference absolute gravimeter gravity measurement vibration influence

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Interpretation of Geological and gravity Data from the Bamiléké Plateau (West-Cameroon): Implication for the Understanding of Its Underground Lithotectonic Geometry

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Journal of Geoscience and Environment Protection 2024年第9期12卷 283-314页

作者： Louis Christian Kamgang Chendjou Jean Victor Kenfack Jules Tcheumenak Kouémo Fidèle Koumetio Armand Kagou Dongmo Department of Earth Sciences Faculty of Science University of Dschang Dschang Cameroon Department of Earth Sciences Faculty of Sciences University of Douala Douala Cameroon Department of Physics Faculty of Sciences University of Dschang Dschang Cameroon

The Bamiléké Plateau represents a key domain in the understanding of the geodynamics associated with the central Cameroon shear. The study aimed to highlight the subsurface architecture of the plateaus basement setting with focus on high potential areas for hydrogeological and mining development projects. To this end, geological field observations were carried out. Since the structures sought were near-surface, a separation approach based on the upward continuation method was applied to the Bouguer anomaly grid. A set of processing techniques, including vertical derivative or DZ, analytical signal or SA and categorization of gravity signatures, was applied to generate the residual map. The synthesis geological model, obtained from analysis and interpretation of the various transformed maps and 2.5D modeling of two gravity profiles P1 and P2 highlights the following features: 1) intrusions of steep-sided granitic batholiths from Dschang to Bandjoun (profile P1), increasing in width from NW (Dschang) to SE (Bandjoun);2) larger volume batholiths with moderate sides located at Bafang and Bangangté (profile P1). These plutonic massifs were weakened by brittle deformation, which favored the emplacement of phonolite or anorthosite dykes within them. The emplacement of these dykes was accompanied by compressional faults with high dip between Dschang and Bandjoun and extensional faults with medium dip between Bafang and Bangangté. These fault zones (trending N85E to N95E) are ideal for hydrogeological investigations in a basement setting, as well as a series of dyke networks that could potentially be preferred zones for the circulation and accumulation of useful substances. The resulting geological sections P1 and P2 highlight the influence of granitic intrusions in the geological system of the study area, as well as the structural control associated with the various dyke intrusions. All the models obtained can serve as fundamental references for hydrogeological and mining e

关键词： Bamiléké Plateau gravity measurement gravity Anomalies Lineaments

PRECISE LEVELING OF THE VERY LONG QINLING MOUNTAIN TUNNEL

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Geo-Spatial Information Science 2000年第1期3卷 57-61页

作者： ZHANG Zhenglu YANG Zhentao XU Shaoquan ZHANG Xiangduo School of Geo-science and Surveying Engineering WTUSM Wuhan China

The Qinling tunnel with length of 18. 488km is located on the railway line from Xi’ an (Shanxi Province) to Ankan (Sichuan Province) in the middle of Qinling moun- tain. It is the longest double track railway tunnel in China and takes the third place in the world. According to the design, the break-through error in vertical direction caused by the al- timetric control surveying is limited to 18mm for the case of one piercing face. Because the leveling route reaches over 120km in length and must go over two mountains in 2 800m height, the first-order precise leveling and precise gravity measurement should be carried out in the construction stage. In this paper the field leveling approach, the application of new technology,some experience as well as the office calculation with final results analysis are in- troduced. By meticulous planning, organization and observation, the final accuracy of vertical difference between two tunnel end points is only 8mm, and it provides reliable surveying guarantee for this great tunnel engineering. Finally it is pointed out that this vertical differ- ence distinguishes obviously from the primary measurement result as high as 114mm. It means that the primary result is not accurate enough.

关键词： tunnel break-through error vertical control surveying gravity measurement

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