000195953 001__ 195953
000195953 003__ CZ-ZdVUG
000195953 005__ 20191119103326.0
000195953 041__ $$aeng
000195953 040__ $$aABC039$$bcze
000195953 1001_ $$aPálinkáš, Vojtěch
000195953 24510 $$aOn the determination of verticality and Eötvös effects in absolute gravimetry
000195953 300__ $$a9 stran
000195953 5203_ $$aWe present a new method for an accurate alignment of the verticality in absolute gravimeters with macroscopic objects that allows simultaneous determination of the Eötvös effect. The method is based on measurements of lateral motions of freely falling objects by a position sensitive detector and has been experimentally used for one FG5 and one FG5X gravimeter. As for the verticality effect, we show that the current method (using alcohol pool) is insufficient and that systematic errors exceeding 1 µGal might be expected, as demonstrated for FG5X-251. The new method of verticality alignment based on minimizing the measured lateral accelerations allows to reduce systematic errors to about 0.1 µGal. Moreover, the measurements/underlying the alignment can be used for determination of the Eötvös effect that depends on the lateral velocity of the falling object in the east-west direction. The results for two FG5(X) gravimeters are presented, with Eötvös effects below 1 µGal that, however, cause biased gravity values so that relevant corrections should be applied. The method we are presenting does not allow to determine the verticality and Eötvös effects for particular drops in a measurement mode of a gravimeter. To do so, optical paths in the interferometer should have to be re-designed. Nevertheless, it is possible to determine both effects with a standard uncertainty better than 0.2 µGal using less than 50 drops carried out in a non-measurement mode.
000195953 655_4 $$ačlánek v odborném periodiku
000195953 7730_ $$92018$$dSpojené království Velké Británie a Severního Irska,2018.$$g55. (4), s.451-459$$tMetrologia$$x0026-1394
000195953 8564_ $$uhttps://iopscience.iop.org/article/10.1088/1681-7575/aac522
000195953 85642 $$ahttps://www.rvvi.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F18%3AN0000037%21RIV19-GA0-00025615
000195953 910__ $$aABC039
000195953 980__ $$aclanky_vugtk
000195953 985__ $$apalinkas
000195953 985__ $$ariv
000195953 985__ $$autvar24