Transducer shadow correction for applied technologies Sonic K-Probe

In the K-probe, as in many sonic probes available today, the transducers at the ends of its acoustic paths cast a "shadow" on the paths, causing the measured wind velocity component along the path to be underestimated. The degree of attenuation is a function of the angle between the wind direction and the acoustic path which increases with decreasing angle, reaching a minimum at 0°. At angles close to 90°, there is virtually no attenuation.

The exact functional form for the attenuation varies with probe design. For the K-probe, the form is approximated by two straight line fits based on wind tunnel tests conducted by C.B. Baker (personal communication, 1989).