Measuring wind direction and strength in layer near ground i.e. up to 100 to 200 m - releasing balloon filled with light gas and attached to coil of light thread for observation of direction and speed of unwinding

摘要

A method of measuring the strength and direction of the wind in layers near the ground involves using a balloon (1) filled with light gas as a buoyancy body. The balloon is attached to a light chord (2) which runs out from a spool (3) as the balloon rises. The rate of revolution of the spool is measured and compared with that for the balloon rising when there is no wind to determine the wind drift and resulting horizontal wind speed. USE/ADVANTAGE - Economical measurement and evaluation of data. Estimating landing points of non-dirigible balloons and airships as well as likely performance of parachutes.