Engineers at the Arnold Engineering Development Complex and the American company MetroLaser are using a new type of laser measurement system to test the speed of engine exhaust and help find ways to reduce aircraft noise.

In November 2021, a team from MetroLaser used the J85 engine testbed maintained by Arnold Engineering Development Complex (AEDC) at the University of Tennessee Space Institute’s Propulsion Research Facility (PRF) near Arnold Air Force Base, Tennessee, to study its three-component planar Doppler. velocimetry (PDV), a system that allows non-intrusive optical measurements of the velocity of gases at the exhaust of an engine.

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