Accession Number : ADD011377

Title :   Turbulence Measurement Interferometer Apparatus.

Descriptive Note : Patent,


Personal Author(s) : Geary,J M

Report Date : 14 Aug 1984

Pagination or Media Count : 6

Abstract : Turbulence measurement interferometer apparatus includes a station having an entrance pupil and an aerodynamically stable boom connected to the station. The station houses an optical mirror arrangement defining an optical axis which extends through the entrance pupil. The boom has an end point spaced from the station but disposed on the optical axis. A laser generates a low power beam which is split into first and second portions. The first portion is guided to the boom end point and launched therefrom as a spherical wavefront through turbulence in front of the entrance pupil and toward the mirror arrangement, which in turn transforms it into an object collimated wavefront. The second portion of the beam is transformed into a second collimated reference wavefront which is combined with the first collimated wavefront and produces an interference pattern which is recorded on a medium, such as a photographic plate. The interference pattern provides information on the turbulence structure present at the entrance pupil of the station.

Descriptors :   *Patents, *Optical interferometers, *Laser beams, Turbulence, Mirrors, High energy, Booms(Equipment), Aerodynamic stability, Beam splitting, Wavefronts

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE