Title :
New method of digital fringe signal processing in an absolute gravimeter
Author :
Tsubokawa, T. ; Svitlov, S.
Author_Institution :
Div. of Earth Rotation, Nat. Astron. Obs., Iwate, Japan
Abstract :
We describe a digital fringe signal processing method realized in the new Tsubokawa-type transportable absolute gravimeter. A data processing algorithm based on the second-differences method has used neither the fringes counting nor the nonlinear least squares fitting. The relative combined standard uncertainty is less than 1/spl middot/10/sup -9/ of an absolute gravity value.
Keywords :
Michelson interferometers; finite difference methods; geophysical signal processing; gravimeters; measurement standards; measurement uncertainty; Michelson interferometer; Tsubokawa-type transportable gravimeter; absolute gravimeter; absolute gravity; data processing algorithm; digital fringe signal processing method; free-fall multiple-stations method; fringe phase detection; relative combined standard uncertainty; second-differences method; zero crossings; Data processing; Digital signal processing; Earth; Gravity measurement; Least squares methods; Metrology; Signal processing; Signal processing algorithms; Testing; Uncertainty;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1998 Conference on
Conference_Location :
Washington, DC, USA
Print_ISBN :
0-7803-5018-9
DOI :
10.1109/CPEM.1998.700125
