Relevant bibliographies by topics / Gravimeters (Geophysical instruments)

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  1. Journal articles
  2. Dissertations / Theses
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  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Gravimeters (Geophysical instruments)'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Gravimeters (Geophysical instruments)"

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Vitushkin, L. F., E. P. Krivtsov, P. P. Krolitsky, V. V. Nalivaev, O. A. Orlov, and M. M. Haleev. "State primary special standard of acceleration unit in the field of gravimetry GET 190-2023: reproduction and transmission of the unit under the influence of geophysical factors." Izmeritel`naya Tekhnika, no. 1 (March 8, 2024): 4–11. http://dx.doi.org/10.32446/0368-1025it.2024-1-4-11.

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The relevance of research on the reproduction and transmission of the acceleration unit in gravimetry is determined by the development of measuring instruments for the absolute value of the acceleration of free fall and its changes. Qualitative and quantitative changes in the instrument base are due to the requirements of applied tasks solved using gravimetric data in such fields as geodesy, navigation, geodynamics, as well as the expansion of the field of practical application of absolute gravimeters. At the same time, in order to solve applied problems, along with accuracy requirements at a level close to the maximum achievable at the current level of technology development, maximum territorial coverage of measurement sites within the entire territory of the Russian Federation is often necessary. The accuracy of the results obtained with the help of measuring instruments is determined by the level of their metrological support, the main stages of which are the reproduction of the corresponding unit by the standard and its transfer to the measuring instrument. An analysis of possible sources of errors in gravimetric equipment has shown that when reproducing and transmitting the acceleration unit in gravimetry, it is necessary to take into account the influence of geophysical factors that manifest themselves as additional accelerations of a gravitational or inertial nature. The distribution of the gravitational field within a gravimetric point can manifest itself as an additional constant acceleration. Seismic processes and lunar and solar tides manifest themselves as variable accelerations. For various stages of metrological support of gravimetric devices, the mechanisms of the effects of such accelerations have been studied, as well as methods for accounting and reducing their influence using additional equipment have been developed. An additional gravimetric point with a cryogenic relative gravimeter and a broadband seismometer, as well as transported absolute ballistic and relative quartz gravimeters, were introduced into the State primary special standard of acceleration units in the field of gravimetry GET 190-2023.
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Wu, Xuejian, Zachary Pagel, Bola S. Malek, Timothy H. Nguyen, Fei Zi, Daniel S. Scheirer, and Holger Müller. "Gravity surveys using a mobile atom interferometer." Science Advances 5, no. 9 (September 2019): eaax0800. http://dx.doi.org/10.1126/sciadv.aax0800.

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Mobile gravimetry is important in metrology, navigation, geodesy, and geophysics. Atomic gravimeters could be among the most accurate mobile gravimeters but are currently constrained by being complex and fragile. Here, we demonstrate a mobile atomic gravimeter, measuring tidal gravity variations in the laboratory and surveying gravity in the field. The tidal gravity measurements achieve a sensitivity of 37 μGal/Hz (1 μGal = 10 nm/s2) and a long-term stability of better than 2 μGal, revealing ocean tidal loading effects and recording several distant earthquakes. We survey gravity in the Berkeley Hills with an uncertainty of around 0.04 mGal and determine the density of the subsurface rocks from the vertical gravity gradient. With simplicity and sensitivity, our instrument paves the way for bringing atomic gravimeters to field applications.
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NOVÁK, Adam, and Juraj JANÁK. "Estimating the thermal effect in gPhoneX observations." Contributions to Geophysics and Geodesy 52, no. 4 (December 12, 2022): 501–15. http://dx.doi.org/10.31577/congeo.2022.52.4.1.

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Stationary relative gravimeters are used in variety of applications, mainly due to their high sampling rate which is more suitable for study of certain geodynamic effects than absolute gravimeters. Study of weak signals is almost exclusively in the domain of superconducting gravimeters, as they possess the highest accuracy and stability of all types of relative gravimeters. Possible alternative to superconducting gravimeters are portable earth tide metal spring gravimeters. Zero-length spring gravimeters (e.g. LCR instruments) are usually considered to be the most accurate mechanical spring gravimeters. However, compared to superconducting instruments they remain too unstable for long-term gravity monitoring. Main reason supporting this statement is related to instrument's sensitivity to temperature changes and temperature induced tilts. Gravity observations from the gPhoneX #108 gravimeter stationed at Hurbanovo gravimetric observatory were tested in order to confirm the correlation between the observed gravity changes and ambient temperature changes and provide a solution for correcting the gPhone data for influence of the ambient temperature changes. Paper also aims to serve as a guide for other operators to estimate a parameters required for the calculation of ambient temperature correction.
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Greco, Filippo, Federica Riguzzi, and Giovanna Berrino. "Insights into Seismogenetic Areas in Central Italy from Combined Absolute Gravity and GNSS Measurements." Remote Sensing 13, no. 22 (November 18, 2021): 4649. http://dx.doi.org/10.3390/rs13224649.

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In this study we present and discuss gravity and ground deformation variations, at different time scales, observed in a wide mesh absolute gravity and GNSS network set up in central Italy. The network was installed in the area affected by the 2009 (L’Aquila; Mw 6.1) and 2016 (Amatrice-Norcia; Mw 6.0 and 6.5) seismic activity, in order to verify if gravity and ground deformation variations could be related to seismic effects. The new network includes 5 stations distributed between the Lazio, Umbria, and Abruzzo regions. From 2018 to 2020 three campaigns were carried out using the transportable Micro-g LaCoste FG5#238 and the portable Micro-g LaCoste A10#39 absolute gravimeters and completed with two simultaneous GNSS measurements. Topographic instruments, measurement and analysis techniques enabling accurate measurements in the positioning of the stations and to control their variations over time were applied. The high reliability and accuracy of the absolute gravity data gathered, after being corrected for known effects, showed a negative short-term (2018–2020) pattern throughout the area, up to −30 µGal. Since some stations of the new network coincided with benchmarks already measured in the past, an analysis of long-term gravity changes was carried out and a fair degree of stability was observed in two stations, while positive large variations, of approximately 70 and 157 µGal, were recorded in the other two stations in the time intervals 1954–2020 and 2005–2010, respectively. On the other hand, variations highlighted by GNSS height measurements were all below 3 cm. Here, the first long-lasting gravity measurements carried out with absolute gravimeters in a seismic area in Italy are presented, providing meaningful geophysical information. The obtained results, in terms of availability of a combined absolute gravity and GNSS network, definition of data acquisition and analysis procedures, as well as creation of a high quality data archive, lay the foundations for a multidisciplinary approach towards improving the knowledge of this seismogenetic area of Italy.
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Cooke, Anne-Karin, Cédric Champollion, and Nicolas Le Moigne. "First evaluation of an absolute quantum gravimeter (AQG#B01) for future field experiments." Geoscientific Instrumentation, Methods and Data Systems 10, no. 1 (March 24, 2021): 65–79. http://dx.doi.org/10.5194/gi-10-65-2021.

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Abstract. Quantum gravimeters are a promising new development allowing for continuous absolute gravity monitoring while remaining user-friendly and transportable. In this study, we present experiments carried out to assess the capacity of the AQG#B01 in view of future deployment as a field gravimeter for hydrogeophysical applications. The AQG#B01 is the field version follow-up of the AQG#A01 portable absolute quantum gravimeter developed by the French quantum sensor company Muquans. We assess the instrument's performance in terms of stability (absence of instrumental drift) and sensitivity in relation to other gravimeters. No significant instrumental drift was observed over several weeks of measurement. We discuss the observations concerning the accuracy of the AQG#B01 in comparison with a state-of-the-art absolute gravimeter (Micro-g-LaCoste, FG5#228). We report the repeatability to be better than 50 nm s−2. This study furthermore investigates whether changes in instrument tilt and external temperature and a combination of both, which are likely to occur during field campaigns, influence the measurement of gravitational attraction. We repeatedly tested external temperatures between 20 and 30 ∘C and did not find any significant effect. As an example of a geophysical signal, a 100 nm s−2 gravity change is detected with the AQG#B01 after a rainfall event at the Larzac geodetic observatory (southern France). The data agreed with the gravity changes measured with a superconducting relative gravimeter (GWR, iGrav#002) and the expected gravity change simulated as an infinite Bouguer slab approximation. We report 2 weeks of stable operation under semi-terrain conditions in a garage without temperature-control. We close with operational recommendations for potential users and discuss specific possible future field applications. While not claiming completeness, we nevertheless present the first characterization of a quantum gravimeter carried out by future users. Selected criteria for the assessment of its suitability in field applications have been investigated and are complemented with a discussion of further necessary experiments.
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Pettersen, Bjørn Ragnvald. "A historical review of gravimetric observations in Norway." History of Geo- and Space Sciences 7, no. 2 (October 27, 2016): 79–89. http://dx.doi.org/10.5194/hgss-7-79-2016.

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Abstract. The first gravity determinations in Norway were made by Edward Sabine in 1823 with a pendulum instrument by Henry Kater. Seventy years later a Sterneck pendulum was acquired by the Norwegian Commission for the International Arc Measurements. It improved the precision and eventually reduced the bias of the absolute calibration from 85 to 15 mGal. The last pendulum observations in Norway were made in 1955 with an instrument from Cambridge University. At a precision of ±1 mGal, the purpose was to calibrate a section of the gravity line from Rome, Italy, to Hammerfest, Norway. Relative spring gravimeters were introduced in Norway in 1946 and were used to densify and expand the national gravity network. These data were used to produce regional geoids for Norway and adjacent ocean areas. Improved instrument precision allowed them to connect Norwegian and foreign fundamental stations as well. Extensive geophysical prospecting was made, as in other countries. The introduction of absolute gravimeters based on free-fall methods, especially after 2004, improved the calibration by 3 orders of magnitude and immediately revealed the secular changes of the gravity field in Norway. This was later confirmed by satellite gravimetry, which provides homogeneous data sets for global and regional gravity models. The first-ever determinations of gravity at sea were made by pendulum observations onboard the Norwegian polar vessel Fram during frozen-in conditions in the Arctic Ocean in 1893–1896. Simultaneously, an indirect method was developed at the University of Oslo for deducing gravity at sea with a hypsometer. The precision of both methods was greatly superseded by relative spring gravimeters 50 years later. They were employed extensively both at sea and on land. When GPS allowed precise positioning, relative gravimeters were mounted in airplanes to cover large areas of ocean faster than before. Gravimetry is currently being applied to study geodynamical phenomena relevant to climate change. The viscoelastic postglacial land uplift of Fennoscandia has been detected by terrestrial gravity time series as well as by satellite gravimetry. Corrections for local effects of snow load, hydrology, and ocean loading at coastal stations have been improved. The elastic adjustment of present-day melting of glaciers at Svalbard and in mainland Norway has been detected. Gravimetry is extensively employed at offshore oil facilities to monitor the subsidence of the ocean floor during oil and gas extraction.
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Vu, Dinh Toan, Jérôme Verdun, José Cali, Marcia Maia, Charles Poitou, Jérôme Ammann, Clément Roussel, Jean-François D’Eu, and Marie-Édith Bouhier. "High-Resolution Gravity Measurements on Board an Autonomous Underwater Vehicle: Data Reduction and Accuracy Assessment." Remote Sensing 16, no. 3 (January 25, 2024): 461. http://dx.doi.org/10.3390/rs16030461.

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Gravity on Earth is of great interest in geodesy, geophysics, and natural resource exploration. Ship-based gravimeters are a widely used instrument for the collection of surface gravity field data in marine regions. However, due to the considerable distance from the sea surface to the seafloor, the spatial resolution of surface gravity data collected from ships is often insufficient to image the detail of seafloor geological structures and to explore offshore natural minerals. Therefore, the development of a mobile underwater gravimetry system is necessary. The GraviMob gravimeter, developed for a moving underwater platform by Geo-Ocean (UMR 6538 CNRS-Ifremer-UBO-UBS), GeF (UR4630, Cnam) and MAPPEM Geophysics, has been tested over the last few years. In this study, we report on the high-resolution gravity measurements from the GraviMob system mounted on an Autonomous Underwater Vehicle, which can measure at depths of up to several kilometres. The dedicated GraviMob underwater gravity measurements were conducted in the Mediterranean Sea in March 2016, with a total of 26 underwater measurement profiles. All these measurement profiles were processed and validated. In a first step, the GraviMob gravity measurements were corrected for temperature based on a linear relationship between temperature and gravity differences. Through repeated profiles, we acquired GraviMob gravity measurements with an estimated error varying from 0.8 to 2.6 mGal with standard deviation after applying the proposed temperature correction. In a second step, the shipborne gravity data were downward continued to the measurement depth to validate the GraviMob measurements. Comparisons between the corrected GraviMob gravity anomalies and downward continued surface shipborne gravity data revealed a standard deviation varying from 0.8 to 3.2 mGal and a mean bias value varying from −0.6 to 0.6 mGal. These results highlight the great potential of the GraviMob system in measuring underwater gravity.
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Genrich, J. F., and J. B. Minster. "Near‐real time reduction of shipboard gravity using Kalman‐filtered GPS measurements." GEOPHYSICS 56, no. 12 (December 1991): 1971–79. http://dx.doi.org/10.1190/1.1443008.

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We have developed a Kalman filter to estimate accurate Eötvös corrections and horizontal ship accelerations from Global Positioning System (GPS) fixes. High‐resolution shipboard gravity measurements are obtained with a newly designed, linear phase, Finite Impulse Response (FIR) low‐pass filter. Both filters are combined to yield accurate, near‐real time, Eötvös‐corrected underway gravity estimates. Error ranges that reflect uncertainty in navigation for these estimates are calculated from autocovariances of Kalman velocity estimates by means of variance propagation expressions for time‐invariant linear digital filters. Estimates of horizontal ship acceleration are combined with a simplified instrument impulse response model in an attempt to remove transient noise from the gravimeter output. We apply the technique to data collected by two shipboard gravimeters, a LaCoste & Romberg Model S Air‐Sea Gravity Meter and a Bell Aerospace BGM-3 Marine Gravity Meter System, operated side‐by‐side on the Scripps R/V Thomas Washington during Leg 1 of the Roundabout expedition. In the absence of significant horizontal accelerations due to course or speed changes, both instruments yield data with good repeatability, characterized by rms differences of less than 1 mGal. Horizontal accelerations generate transient signals that cannot be modeled at present to an accuracy of better than 5 mGal. Difficulties in removing these transients are primarily due to insufficient quantitative knowledge of the response of the instrument, including the gyro‐stabilized platform. This can be determined analytically or empirically.
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Dransfield, Mark. "Searchlights for gravity and magnetics." GEOPHYSICS 80, no. 1 (January 1, 2015): G27—G34. http://dx.doi.org/10.1190/geo2014-0256.1.

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The development of mental schemata is important in developing an understanding of physical phenomena and processes. Gravitational and magnetic fields are often visualized by geophysicists as equipotential surfaces (for gravity) and field lines (for magnetics). In these cases, the schemata treat the geology as the source of the field. In seismic and electromagnetic prospecting, one instead visualizes a field that is emitted by the instrument. Example schemata are traveling wavefronts (seismic) and smoke rings (electromagnetic induction in the dissipative limit). I carried this instrument-focused conceptualization over to potential field prospecting by a schema, which envisages the instrument as a probe, illuminating the earth in a manner analogous to a searchlight. Different potential-field instruments (potentiometers, gravimeters, magnetometers, and gradiometers) each have different beam characteristics and consequently illuminate the earth in different ways. This schema provides a new way of visualizing potential fields in prospecting with applications in instrument development, data acquisition and processing, and interpretation.
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Xie, Dongdong, Shuhua Yan, Lingxiao Zhu, Huankai Zhang, and Xu Zhang. "Review on Vibration Isolation Method for Atomic Interference Gravimeter." Journal of Physics: Conference Series 2125, no. 1 (November 1, 2021): 012022. http://dx.doi.org/10.1088/1742-6596/2125/1/012022.

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Abstract The cold atomic interference absolute gravimeter is an ultra-precision instrument for measuring absolute gravity acceleration. At present, the highest measurement accuracy can reach the order of micro gamma. It has important application value and research significance in many disciplines, such as geophysics, resource exploration and assisted navigation. Because of its ultra-high precision, the ultra-low frequency micro-vibration noise on the ground has become one of the important factors affecting its accuracy, and it is also the bottleneck of the further development of gravimeter. Firstly, based on the theoretical and experimental results, this paper analyzes the vibration isolation requirements of atomic interference gravimeter. Secondly, it summarizes the research progress of atomic interference gravimeter isolation system and introduces three main isolation methods: passive vibration isolation, active vibration isolation and vibration compensation. Finally, the future development direction of atomic interference gravimeter isolation technology is analyzed and prospected.
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Dissertations / Theses on the topic "Gravimeters (Geophysical instruments)"

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Ridgway, Jeffrey R. "The development of a deep-towed gravity meter, and its use in marine geophysical surveys of offshore Southern California and an airborn laser altimeter survey of Long Valley, California /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9907824.

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Amarante, Rogério Rodrigues 1972. "Sistematização do processamento de dados gravimétricos aplicados a determinação do modelo geoidal." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258364.

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Orientador: Jorge Luiz Alves Trabanco
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Made available in DSpace on 2018-08-21T16:53:48Z (GMT). No. of bitstreams: 1 Amarante_RogerioRodrigues_D.pdf: 8479306 bytes, checksum: c6760b22f8c1f110ad1b61e48c59508b (MD5) Previous issue date: 2012
Resumo: Com o uso de métodos adequados, receptores GNSS podem determinar coordenadas com acurácia suficiente para aplicação em projetos de engenharia. Porém a altitude elipsoidal obtida não utiliza o mesmo sistema de referência da engenharia de transportes. A altitude elipsoidal pode ser transformada em ortométrica com a utilização de modelos geoidais que são gerados a partir de dados gravimétricos. Neste trabalho são apresentados alguns conceitos introdutórios sobre a geração de modelo geoidais. Em seguida mostra o desenvolvimento de uma nova sistematização do tratamento de dados gravimétricos com objetivo de facilitar a detecção de erros, aumentar a produtividade e melhorar a organização de resultados obtidos. Dentro deste desenvolvimento, são revisadas as teorias utilizadas para transformar medições feitas com gravímetros diferenciais em aceleração da gravidade. Apresenta também técnicas de ajustamento de observações com intuito tratar erros aleatórios. A nova abordagem sugerida foi utilizada para o desenvolvimento de um software objetivando validar as idéias propostas, permitir a comparação com outras soluções existentes e também servir como uma contribuição tecnológica. Dados gravimétricos reais foram testados dentro da abordagem proposta tendo sido observados mais organização, ganho de produtividade e principalmente a detecção de erros grosseiros e aleatórios. Com a revisão do cálculo da correção da maré, percebeu-se que programas e equipamentos atualmente em uso não possuem configuração do fator gravimétrico, fato que pode influenciar em até 0; 007mGals no processamento das observações
Abstract: With the use of appropriate methods, GNSS receivers can determine coordinates with sufficient accuracy for use in projects. The ellipsoidal height obtained, however, does not use the same reference system as the one used in transportation engineering. The ellipsoidal height can be transformed to orthometric height using geoid models that are generated from gravimetric data. In this work some introductory concepts on the generation of geoid model are presented. Then it shows the development of a new approach in systematization of gravimetric data processing aiming to facilitate the detection of errors, increase productivity and improve the organization of the results obtained in the gravimetric surveys. Within this development, the theories used to convert measurements of the differences in gravity acceleration are revised. It also features adjustment techniques of observations in order to deal with random errors. The new suggested approach was used to develop software in order to validate the proposed ideas, allow comparison with other existing solutions, and also serves as a technological contribution. Gravimetric data were tested within the suggested approach. It was observed better organization, productivity gains and mainly detection of gross errors and random. With the review of the tide correction calculation, it was realized that programs and equipments now widely used have no gravimetric factor setting, a fact that can influence up to 0; 007mGals in processing the readings
Doutorado
Transportes
Doutor em Engenharia Civil
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Abd, El-Gelil Mahmoud Salem. "Superconducting gravimetry and earth dynamics /." 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:NR51664.

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Thesis (Ph.D.)--York University, 2009. Graduate Programme in Earth and Space Science.
Typescript. Includes bibliographical references (leaves 152-160). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:NR51664
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Books on the topic "Gravimeters (Geophysical instruments)"

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Voutsas, Alexander M. Lunar gravimeter. Beverly Hills, Calif. (9100 Wilshire Blvd., Beverly Hills 90212): Century University, 1986.

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Veselov, K. E. Gravimetricheskai͡a︡ sʺemka. Moskva: "Nedra", 1986.

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Institut fiziki Zemli im. O.I͡U. Shmidta, ed. Apparatura i metodika okeanskikh gravimetricheskikh nabli͡udeniĭ. Moskva: Institut fiziki Zemli AN SSSR, 1988.

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Kurbanov, M. Razrabotka variometricheskoĭ apparatury dli︠a︡ graviseĭsmoprognosticheskikh issledovaniĭ. Ashgabat: Ylym, 1994.

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Arnet, Felix. SG 95, das neue Schweregrundnetz der Schweiz. Zürich, Switzerland: Schweizerische Geodätische Kommission, 1997.

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Wessells, Claude W. Blue Ridge Gravimeter Calibration Base Line, established 1985. Rockville, MD: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Ocean Service, Charting and Geodetic Services, 1985.

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Iliff, Robert L. The AFGL absolute gravity system's error budget revisited. Hanscom AFB, MA: Earth Sciences Division, Air Force Geophysics Laboratory, 1985.

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Iliff, Robert L. The AFGL absolute gravity system's error budget revisited. Hanscom AFB, MA: Earth Sciences Division, Air Force Geophysics Laboratory, 1985.

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Akademii͡a nauk SSSR. Komissii͡a po izuchenii͡u neprilivnykh izmeneniĭ sily ti͡azhesti. Soveshchanie. Povtornye gravimetricheskie nabli͡udenii͡a: Sbornik nauchnykh trudov Soveshchanii͡a Komissii po izuchenii͡u neprilivnykh izmeneniĭ sily ti͡azhesti, Moskva, mart 1986 g. Moskva: Akademii͡a nauk SSSR, Mezhduvedomstvennyĭ geofizicheskiĭ kom-t pri Prezidiume AN SSSR, 1988.

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Iliff, Robert L. The AFGL absolute gravity system's error budget revisited. Hanscom AFB, MA: Earth Sciences Division, Air Force Geophysics Laboratory, 1985.

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Book chapters on the topic "Gravimeters (Geophysical instruments)"

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Niebauer, T. "Gravimetric Methods – Absolute Gravimeter: Instruments Concepts and Implementation." In Treatise on Geophysics, 43–64. Elsevier, 2007. http://dx.doi.org/10.1016/b978-044452748-6.00055-9.

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Conference papers on the topic "Gravimeters (Geophysical instruments)"

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Yao, Jiamin, Wei Zhuang, Jinyang Feng, Yang Zhao, Shaokai Wang, Shuqing Wu, Fang Fang, and Tianchu Li. "An Ultra-Low-Frequency Active Vertical Vibration Isolator With Horizontal Constraints for Absolute Gravimetry." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-68008.

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Abstract Absolute gravimeters have been widely used as an important instrument in geological exploration and geophysics. To achieve a required measurement precision, it is necessary to integrate a vertical vibration isolator with ultra-low resonance frequency into the gravimeter. In this paper, an active vibration isolator designed on the basis of a BM-10 passive vibration isolation platform is presented. In the isolator, a seismometer placed next to the payload on the same plate outputs a voltage signal proportional to the payload’s velocity. According to this signal, a feedback circuit based on a PID controller controls two identical voice coil actuators to drive the platform synchronously. In this way, the vibration of the payload is suppressed. The BM-10 platform has 6-DOF passive vibration isolation originally, but its horizontal vibration isolation is proved unnecessary or even harmful in absolute gravimetry. Hence, two linear bushings are applied as a horizontal constraint to ensure that the payload only moves vertically in a straight line. Experiments show the resonance period of the isolator reaches approximately 88 s. In addition, the active vibration isolator has shown a much better performance for vibrations at low frequency than the passive isolator. In the future, the vibration isolator will be improved and then be integrated in the NIM-AGRb-1 atom-interferometry absolute gravimeter for the evaluation of its performance.
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Wen, Yi, Kang Wu, Meiying Guo, and Lijun Wang. "A Compound Recoil-Compensated Chamber Design for Free-Fall Absolute Gravimeters." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23572.

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Abstract The ballistic free-fall absolute gravimeters are most commonly-used instruments for high-precision absolute gravity measurements in many fields, such as scientific research, resource survey, geophysics and so on. The instrumental recoil vibrations generated by the release of the test mass can cause troublesome systematic bias, because these vibrations are highly reproducible from drop to drop with coherent phase. A compound counterbalanced design of chamber using both belt-driven mechanism and cam-driven structure is proposed in this paper. This structure is designed to achieve excellent recoil compensation as well as long freefall length for high precision measurements. Simulation results show that the recoil vibration amplitude of the compound recoil-compensated structure during the drop is about 1/4 of that with only belt-driven counterbalanced structure. This confirms the feasibility and superiority of the new design. And it is believed that the absolute gravimeter based on this newly proposed chamber design is expected to obtain more precise gravity measurement results in the future.
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