Anemometer beam exits reflect, or backscatter, the light back into a detector, where it is measured relative to the original laser beam. When the particles are in great motion, they produce a Doppler shift for measuring wind speed in the laser light, which is used to calculate the speed of the particles, and therefore the air around the anemometer. Ultrasonic anemometers, first developed in the 1950s, use ultrasonic sound waves to measure wind velocity. They measure wind speed based on the time of flight of sonic pulses between pairs of transducers. Measurements from pairs of transducers can be combined to yield
What Does It Take (Dave Days song) What Does It Take (Dave Days song) "What Does It Take" is a song by American singer Dave Days. It served as the third and final single from his 2010 EP "Dinner and a Movie". It is one of Dave's most recognizable songs, and was also played on Disney Channel's So Random!. The song's music video is set in a high school, where Dave realizes he has gotten the lead part in the school play. Amanda Lynn (Days' interest in the video) sees she has gotten the second lead, and runs to her boyfriend, who ignores her. Days and Lynn