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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microgravimetry—High precision observations of small gravity differences
Abstract The application of a Sartorius 4104 microbalance after Gast in vertical gradiometry was tested. A small mass of about 20 grams is suspended on thin fibers of different lengths Δℓ≤80 cm. From the weight difference of the small mass obtained at different levels along the plumb line the corresponding differences of gravity along the plumb line are inferred. The microbalance is mounted on a steal rack; measurements at constant low pressure (moderate vacuum) show the applicability of the balance as gravity difference sensor for field work. When environmental effects are further reduced (i,e, temperature is kept constant within ±0.1°C; pressure is controlled within 0.1 Torr etc.) the resolution of the balance can be fully exploited so a relative accuracy of ±$ 10^{−9} $ should be feasible and for laboratory experiments should be of the order of a few parts in ±$ 10^{−10} $. Vertical gravity gradients as observed on an improved moving platform with a LaCoste model G gravimeter are discussed. New possibilities of microgravimetry are pointed out. High precision observations and establishment of a system in an area of tectonic interest for detecting secular gravity changes are described.
Microgravimetry—High precision observations of small gravity differences
Abstract The application of a Sartorius 4104 microbalance after Gast in vertical gradiometry was tested. A small mass of about 20 grams is suspended on thin fibers of different lengths Δℓ≤80 cm. From the weight difference of the small mass obtained at different levels along the plumb line the corresponding differences of gravity along the plumb line are inferred. The microbalance is mounted on a steal rack; measurements at constant low pressure (moderate vacuum) show the applicability of the balance as gravity difference sensor for field work. When environmental effects are further reduced (i,e, temperature is kept constant within ±0.1°C; pressure is controlled within 0.1 Torr etc.) the resolution of the balance can be fully exploited so a relative accuracy of ±$ 10^{−9} $ should be feasible and for laboratory experiments should be of the order of a few parts in ±$ 10^{−10} $. Vertical gravity gradients as observed on an improved moving platform with a LaCoste model G gravimeter are discussed. New possibilities of microgravimetry are pointed out. High precision observations and establishment of a system in an area of tectonic interest for detecting secular gravity changes are described.
Microgravimetry—High precision observations of small gravity differences
Groten, Erwin (Autor:in)
1975
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Geodäsie , Geometrie , Geodynamik , Mathematik , Mineralogie
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