Reconstruction of the free-falling body trajectory in an optical interferometric absolute gravimeter (Retraction Notice)

Absolute gravimeter uses optical interferometry to measure the trajectory of the free-falling body in vacuum and gets the best estimate of the gravity acceleration by least squares fitting calculation. In this paper, polynomial fitting is used to suppress the common drift of the interference fringe and the trajectory reconstruction of the free-falling body is realized by using the method of linear interpolation zero-crossing detection. The uncertainty of the measurement introduced by this method is analyzed in detail and the results show that with the maximum frequency of the interference fringes f0=4.17MHz and sampling rate fs=83.3MHz, the gravity acceleration measurement uncertainty introduced is 0.19μGal(μGal=10-8m/s2 ).