The sound, the ultrasound, is transported by the movement of the fluid it crosses. Electro-acoustic transducers communicate two to two by ultrasonic signals following two orthogonal axes. This makes it possible to determine the differences in the transit time (waves), induced by the air flow. The measurements are composed in an integrated calculator that establishes the wind modulus (force) and its direction relative to a reference axis.
The temperature measurement is used to further calibrate the calibration. The effect of the inclination of the sensor on the measured wind module is partially corrected by the profile given to the space.
In the CV7 range, the transducers communicate laterally what provides four independent measurements. The validity checks are reinforced and the vectors measured at the front wind are privileged to establish speed and direction. The method provides a sensitivity of 0.13 m/s (0.25 knot), a dynamic of 40 m/s (80 knots) and excellent linearity.