Flow Measurements with a 5 ns Correlator

Abstract

Spectron Development Laboratories, Inc., has implemented a 5 ns interval correlator for photon detection, ultrasonic acoustics, and other applications where existing digital correlators have been too slow or had too few stores. The time multiplexable ‘CORRELEX’ is operable stand-alone and has interface capability for high-speed serial and parallel computer communication. A brief system description is included.

This paper reviews three series of laser flow measurements with CORRELEX processors. Two refer to laser fringe and transit anemometer measurements with a small test jet in the laboratory for the U. S. Air Force Arnold Engineering Development Center. The third is a series of boundary layer measurements taken on a ‘bump model’ in the NASA Ames 6′ × 6′ Transonic Wind Tunnel. Graphic computer printouts of selected data are shown and a brief discussion of precision and limitations is included.