Patent ID: 8931341
Filing Date: 2015-01-13
Classification: G01V

Abstract:
1. A test mass having a center of mass point and which is adapted to freefall under the influence of gravity in an interferometric light beam gravity characteristic measurement apparatus, comprising: a first retroreflector having an optical center point and operative to reflect a first incident light beam as a first reflected light beam; a second retroreflector having an optical center point and operative to reflect a second incident light beam as a second reflected light beam; and wherein: the first and second retroreflectors are retained on the test mass with their respective optical center points each separated at a finite equal distance from the center of mass point, with the optical center points and the center of mass point all co-linear with one another, with the center of mass point located between the optical center points, and with the first and second retroreflectors oriented to reflect the first and second reflected light beams parallel to one another and in opposite directions from one another.