000195969 001__ 195969
000195969 003__ CZ-ZdVUG
000195969 005__ 20191209131938.0
000195969 041__ $$aeng
000195969 040__ $$aABC039$$bcze
000195969 1001_ $$aPálinkáš, Vojtěch
000195969 24510 $$aTwo methods for determination of the effective wavenumber of gaussian beams in absolute gravimeters
000195969 300__ $$a13 stran
000195969 5203_ $$aThis paper presents two methods for evaluation of the effective wavenumber of nearly Gaussian beams in laser interferometers that can be used for determination of the so called diffraction correction in absolute gravimeters. The first method, that can be simply used in situ, is an empirical procedure based on the evaluation of the variability of g measurements against the amount of light limited by an iris diaphragm and transmitted to a photodetector. However, the precision of this method depends on the beam quality similarly as in case of the conventional method based on measurement of beam width. The second method, that is more complex, is based on beam profiling in various distances and on calculation of the effective wavenumber using the second spatial derivative of the non-ideal beam field envelope. The measurement results achieved by both methods are presented on the example of two absolute gravimeters and the determined diffraction corrections are compared with results obtained by measurements of beam width. Agreement of methods within about 1 µGal have been found with average diffraction corrections slightly exceeding +2 µGal for three FG5(X) gravimeter's configurations.
000195969 655_4 $$ačlánek v odborném periodiku
000195969 7730_ $$92018$$dPolská republika,2018.$$g25 (4), s. 701-713$$tMetrology and measurement systems$$x0860-8229
000195969 8564_ $$uhttp://journals.pan.pl/Content/108926/PDF/art_05.pdf?handler=pdf
000195969 85642 $$ahttps://www.rvvi.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F18%3AN0000038%21RIV19-GA0-00025615
000195969 910__ $$aABC039
000195969 980__ $$aclanky_vugtk
000195969 985__ $$apalinkas
000195969 985__ $$ariv
000195969 985__ $$autvar24