Abstract
In a ballistic gravimeter, when a test body rotates during free fall an optical path error results, unless the centre of mass (COM) and the optical centre of the corner cube are exactly co-located. The error associated with the rotation needs to be held to 1 µGal (1 µGal = 10−8 m s−2) or less, so as to not compromise the accuracy of today's absolute gravimeters. This error is systematic, difficult to monitor and can be decreased in only two ways: (1) by reducing the rotation rate of the falling object and/or (2) by minimizing the distance between the COM of the dropping object and the optical centre of the corner cube embedded in it. We report here on a new direct and extremely sensitive method for minimizing the distance between the COM and the optical centre.
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