1990 年 46 巻 3 号 p. 143-146
A short (3cm) span sonic anemometer for vertical wind component was developed using inexpensive ultrasonic transducers. Wind tunnel test indicates this anemometer can be used within the tilt angle about ±30°. A field test with a commercial sonic anemometer (span=20cm) at two heights indicates that high frequency attenuation is less for the new short span anemometer near the surface.