Multi-point FLEET velocimetry in a Mach 4 Ludwieg tube using a diffractive optical element Academic Article uri icon


  • A diffractive optical element was paired with femtosecond laser electronic excitation tagging (FLEET) velocimetry and used to probe multiple locations in a high-speed wind tunnel. Two configurations were explored, one that uses the traditional method of viewing from a perspective orthogonal to the beam axis and another that uses a perspective parallel to the beam axis. In the latter, the FLEET emissions are viewed as points that can allow for FLEET measurements in a wall normal fashion without the laser needing to impinge upon the surface. The configurations are demonstrated in a Mach 4 Ludwieg tube, highlighting their utility in high-speed flow measurements.

published proceedings

  • Applied Optics

author list (cited authors)

  • Siddiqui, F., & Gragston, M.

citation count

  • 0

complete list of authors

  • Siddiqui, Farhan||Gragston, Mark

publication date

  • February 2024