Crossed-beam technique for measuring horizontal winds

Three ground-based single-beam detectors determine wind vectors present within a given volume. Winds approximately constant near a selected height, blowing into or out of a 90 degree arc can be calculated with reasonably small error

Wind vector calculation using crossed-beam data and detector arrangement for measuring horizontal winds

Vector calculations using crossed beam data and detector arrangement for measuring horizontal wind

Wind determination based on eddy transit times measured between four non-intersecting light beams

Wind determination based on eddy transit times measured between four nonintersecting light beam