First laser light for GRACE Follow-On
06 July 2018
The laser ranging interferometer (LRI) instrument has been successfully switched on aboard the recently launched twin U.S./German Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) satellites. The LRI, which is being flown as a technology demonstration, has made its first measurements in parallel with GRACE-FO's main microwave ranging instrument, and initial comparisons of the data from the two types of instruments show that they agree as expected.
"The LRI is a breakthrough for precision distance measurements in space," said LRI Instrument Manager Kirk McKenzie of NASA's Jet Propulsion Laboratory in Pasadena, California, which manages NASA's contribution to the instrument. "It's the first inter-spacecraft laser interferometer and the culmination of about a decade of NASA- and German-funded research and development."
Image credit: NASA/JPL-Caltech - Artist's rendering of the twin spacecraft of the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission.