An Investigation of the Automatic Relative Gravimeters

Paršeliūnas, Eimuntas; Petroškevičius, Petras; Obuchovski, Romuald; Birvydienė, Rosita

doi:10.4028/www.scientific.net/ssp.199.261

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…According to Scintrex Ltd. (2012a) the standard deviation of the measurements at any site should be better than 5 µGal under typical noise conditions. This high precision has been confirmed in several studies, e.g., Flury et al (2007), Zumberge et al (2008), Lederer (2009), Jacob et al (2010, Christiansen et al (2011), Yushkin (2011), Parseliunas et al (2008Parseliunas et al ( , 2011Parseliunas et al ( , 2013.…”

Section: Introductionmentioning

confidence: 60%

High tilt susceptibility of the Scintrex CG-5 relative gravimeters

Reudink

Klees

Francis

et al. 2014

J Geod

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We report on the susceptibility of the Scintrex CG-5 relative gravimeters to tilting, that is the tendency of the instrument of provide incorrect readings after being tilted (even by small angles) for a moderate period of time. Tilting of the instrument can occur when in transit between sites usually on the backseat of a car even using the specially designed transport case. Based on a series of experiments with different instruments, we demonstrate that the readings may be offset by tens of µGal. In addition, it may take hours before the first reliable readings can be taken, the actual time depending on how long the instrument had been tilted. This sensitivity to tilt in combination with the long time required for the instrument to provide reliable readings has not yet been reported in the literature and is not addressed adequately in the Scintrex CG-5 user manual. In particular, the inadequate instrument state cannot easily be detected by checking the readings during the observation or by reviewing the final data before leaving a site, pre-cautions suggested by Scintrex Ltd. In regional surveys with car transportation over periods of tens of minutes to hours, the gravity measurements can be degraded by some 10 µGal. In order to obtain high-quality results in line with the CG-5 specifications, the gravimeters must remain in upright position to within a few degrees during transits. This requirement may often be unrealistic during field observations, particularly when observing in hilly terrain or when walking with the instrument in a backpack.

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Section: Introductionmentioning

confidence: 60%

High tilt susceptibility of the Scintrex CG-5 relative gravimeters

Reudink

Klees

Francis

et al. 2014

J Geod

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“…The assessment of gravity modifications is required when reducing data on the measurements of the general system of the coordinates of a certain epoch. With the obtained measurements available, only changes in gravity are assessed [2]; however, variations in gravity direction and the deformations of the equipotential surfaces of the gravity field are not considered. The increasing accuracy of measurements [3,4,5] requires changes of all gravity field elements to be taken into account and thus a more precise assessment of their impact is required.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Disturbing Potential for the Gravity Field

Petroškevičius

Birvydienė

Popovas

2015

SSP

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The Earth’s gravity field tends to change due to various reasons. These are diverse processes occurring inside the Earth or changes initiated by human activity. The increasing accuracy of measurements has enabled to take into consideration fluctuations in the gravity field. The article presents research study on the effect of gravity potential describing variations in the gravity field affecting gravity field elements related to the performed measurements. Due to the effect of the disturbing potential, a change in gravity and the deviation of vertical and equipotential surface deformation have been determined. The paper has analyzed the disturbing effect of the material point or homogeneous sphere and has specified the possibilities of assessing the disturbing effect of any form of the homogeneous body. Based on the tidal potential induced by the celestial body, the disturbing effect of the Moon and Sun onto the Earth’s gravity field has been assessed. The carried out research indicates that the range of deformation changes in the equipotential surface of the Earth’s gravity field induced by the effect of the Moon is equal to 0.4824 m, whereas that of the Sun makes 0.1861 m. The conducted studies prove that, due to the effect of the Moon, the direction of the vertical, in terms of the Earth’s surface, tends to change up to 0.0541", and as a result of the Sun’s effect it could reach 0.0204". Having assessed the Lunisolar effect in the first order vertical network measurements in Lithuania, in a polygon with the perimeter of 451 km, it has been determined that the closing error of normal height difference has decreased by the factor of 1.3.

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“…Increasing the accuracy of geodetic measurements requires a more accurate assessment of non-parallelity of the equipotential surfaces. It is important for the development of modern geodetic basis [1,2], establishment of geodetic networks [3,4], geodetic works in unique objects (hydrotechnical equipment, tunnels, elementary particle accelerators, etc.) in the period of their construction and operation.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the determination feasibility of the non-parallelity of the gravity field equipotential surfaces

Petroškevičius

Birvydienė

Obuchovski

2014

The 9th International Conference "Environmental Engineering 2014"

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Geodetic measurements are performed in heterogeneous gravity field. Its equipotential surfaces have a complex shape. This needs to be estimated when processing detail geodetic measurements data. Orthometric heights are calculated from one of the equipotential surfacegeoid. Applying the normal height system and evaluating normal height differences needs to assess the non-parallelity of the equipotential surfaces of the gravity field. For that aim normal corrections, defining the non-parallelity of equipotential surfaces of normal gravity field and the deviation of the equipotential surfaces of real gravity field from the normal field are calculated. This work presents determination feasibility of the gravity field equipotential surfaces non-parallelity in Lithuanian territory. The six geodetic vertical network lines were selected for a research; the length of all lines is about 300 km. The gravimetric measurements by Scintrex CG-5 were performed at 203 points of the net. A mean square error of gravity acceleration values did not exceed 14 µGal. The normal corrections were calculated for measured height differences between points. A research shows that after reduction of a number of measured points twice, a mean square error of gravity acceleration values, calculated from interpolated Bouguer gravity anomalies, at the "not measured" points seeks 0.474 mGal, however the normal correction values have changed only in 0.01 mm. The use of gravity acceleration values, obtained from gravimetric map with the mean square error of 0.684 mGal, changes normal corrections up to 0.04 mm.

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An Investigation of the Automatic Relative Gravimeters

Cited by 6 publications

References 2 publications

High tilt susceptibility of the Scintrex CG-5 relative gravimeters

High tilt susceptibility of the Scintrex CG-5 relative gravimeters

The Effect of the Disturbing Potential for the Gravity Field

Investigation on the determination feasibility of the non-parallelity of the gravity field equipotential surfaces

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