Laser interferometer for spaceborne mapping of the Earth's gravity field

Marina Dehne, Felipe Guzmn Cervantes, Benjamin Sheard, Gerhard Heinzel, Karsten Danzmann

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The Gravity Recovery and Climate Experiment (GRACE) is one of the present missions to map the Earth's gravity field. The aim of a GRACE follow-on mission is to map the gravitational field of the Earth with higher resolution over at least 6 years. This should lead to a deeper insight into geophysical processes of the Earth's system. One suggested detector for this purpose consists of two identical spacecraft carrying drag-free test masses in a low Earth orbit at an altitude of the order of 300 km, following each other with a distance on the order of 50 to 100 km. Changes in the Earth's gravity field will induce distance fluctuations between two test masses on separate spacecraft. These variations in the frequency range 1 to 100 mHz are to be monitored by a laser interferometer with nanometer precision. We present preliminary results of a heterodyne interferometer configuration using polarising optics, demonstrating the required phase sensitivity.

Original languageEnglish (US)
Article number012023
JournalJournal of Physics: Conference Series
StatePublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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