A New Method for Fringe-Signal Processing in Absolute Gravity Meters

Citation:
Parker, PR, Zumberge MA, Parker RL.  1995.  A New Method for Fringe-Signal Processing in Absolute Gravity Meters. Manuscripta Geodaetica. 20:173-181.

Date Published:

Mar

Abstract:

In all modern absolute gravity meters, an interferometer illuminated with a stabilized laser tracks the motion of a freely falling retroreflector. The value of gravity is measured by timing the passage of interference fringes. Typically, the sinusoidal fringe signal is converted to a series of pulses, a subset of which are input to a time digitizer. In our new system, the fringe signal is digitized with a fast analog-to-digital converter and fit to an increasing-frequency sine wave. In addition to being smaller and less expensive, the system should eliminate some potential systematic errors that may result from imperfect zero-crossing discrimination and pulse pre-scaling.

Notes:

n/a

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