Transcript for scene 9 of the video " Black Holes, Part 6, Gravity Waves" by Rolf Witzsche  

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Measured simultaneously at two different locations

The resulting gravitational waves have been measured simultaneously at two different locations. The method for observation is illustrated in figure 1 and 2. A light beam is split into two separate paths, shown in red and blue, which are recombined and calibrated to precisely match, shown in figure 1. In figure 2, the yellow gravitational wave changes the propagation time for the red light-path slightly. The resulting phase shift becomes a measurement for the gravitational wave.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche