commgrp@silver.ucs.indiana.edu (BACS Data Communications Group) (09/29/90)
Someone gave me an interesting article: An Inexpensive Sonic Anemometer for Eddy Correlation by G. S. Campbell and M.H. Unsworth _Journal of Applied Meteorology_ v. 18, August 1979. It uses inexpensive ultrasonic transducers and PLL circuitry. It has no moving parts, detects very low velocities, is directional, low- powered, and can be built from about $20 worth of Radio Sh*ck parts. It also has a temperature output. I plan to build one for cave-wind and other infrasonic studies. Copy for SASE. -- Frank Reid W9MKV reid@ucs.indiana.edu P.O. Box 5283 Bloomington, IN 47407